5.56 effective range

The effective range of 5.56×45 for hunting is generally around 200-300 yards, depending on the specific load and the shooter’s skill level. Is 5.56×45 suitable for hunting larger game? While some hunters have successfully taken down larger game with 5.56×45, it is generally considered best for small to medium-sized game.

5.56 effective range. Sig Sauer may have the answer in the MCX Rattler PCB! .300 BLK vs 7.62x39mm. Designed for rapid deployment from concealment, the MCX Rattler packs a punch in the .300 BLK configuration. Coming in at 5.1 pounds empty, sporting a 5.5-inch barrel and folded length of 17 inches, the MCX Rattler is definitely compact enough to be …

Photo courtesy of Grasyl . 5.56 Barrel Length Ballistics: the Breakdown. One of the best ways to visualize how barrel length can affect the ballistics of a 5.56 cartridge is with a table. Since I’m such a helpful …

What is the maximum effective range of a 5.56? The maximum effective range of a 556 is 1,000 yards for target shooting and 600 yards for hunting. What is the lethal velocity of …The effective range of an M4 carbine is about 550 yards (500 m). Action Type. The M16 is a rotating bolt rifle with a gas-operated direct impingement firing action. The M4 is similar, but it does not use impingement for its firing action. In this, it hews more closely to the AK-47 design in order to provide a more reliable firing action in ...EFFECTIVE RANGE: 800m, point target; MAXIMUM RANGE: 3600m; TWIST RATE: 1:7″ TRIGGER PULL: 7.9 lb. COLOR: Matte black non-reflective finish; The Implications of the M249 Specifications Caliber. The 249 uses the standard 5.56×45mm NATO (North Atlantic Treaty Organization) round. This round is of a rimless bottlenecked intermediate …From the data, the M4 Carbine with its 14.5″ barrel and 2,920 ft/s muzzle velocity meets our velocity threshold at 125 meters, while the M16A2 with its 20″ barrel and 3,150 ft/s muzzle velocity meets the threshold at 190 meters. In other words, the difference in velocity between the two rifles is enough to create a “gap” in performance ...What is the maximum effective range of a 5.56? The maximum effective range of a 556 is 1,000 yards for target shooting and 600 yards for hunting. What is the lethal velocity of 5.56 ammo? The lethal velocity of 5.56 ammo is about 600 fps.The effective range of a 5.56 caliber round can vary depending on the specific firearm and ammunition, but it is generally around 500-600 meters. What is the muzzle velocity of a 5.56 round? Typical muzzle velocities for 5.56 caliber ammunition can range from 2,750 to 3,000 feet per second.The effective range doesn’t mean the bullet fire with max damage. It means a distance at which the bullet hit at high accuracy. You can understand with an example that .45 ACP and 9mm bullet has a stopping power so it drops faster than standard ar-15 rifle round. On the other side, 5.56 ammo can hit a distance of 600 meters but it is ...A 5.56 AR can shoot quite far, depending on the rifle and the ammunition used. Most AR-15s are chambered for 5.56x45mm NATO, which has a maximum effective range of around 500 meters (1,640 feet). But with the right rifle and ammunition, a 5.56 AR can shoot much farther than that. Shortcuts.

From twist rate to steel Vs. brass to what exactly “XM” and “M” really mean, we got that and the 6 best 5.56 ammo for your AR coming right up! .223 Remington Vs. 5.56 NATO Vs. .223 Wylde. The short version is that any barrel marked 5.56 NATO or .223 Wylde can safely shoot BOTH .223 Rem and 5.56 NATO.HELSINKI, Feb. 24, 2021 /PRNewswire/ -- Ponsse launches a completely modernised range of Scorpion harvesters, which meets all the requirements of ... HELSINKI, Feb. 24, 2021 /PRNew...The Grendel does have a much longer effective range than any other AR-15 cartridge. Although the 6.5 Grendel, being a heavier bullet, has double the recoil and slightly less capacity than the 5.56, it is still more effective in long-range shooting than the 5.56, which has issues at longer ranges and barriers penetration.gunmade ... Loading...HowStuffWorks learns about the free-range parenting philosophy and talks to the movement's founder Lenore Skenazy. Advertisement Take a moment and think about your favorite childho...Feb 19, 2024 · What is the effective range of a 5.56 bolt action rifle? The effective range of a 5.56 bolt action rifle typically extends up to around 500 yards, depending on the specific rifle and ammunition used. Can 5.56 bolt action rifles be used for long-range shooting? Highest grain 223 bullet. 5.56 NATO bullet drop. 556 NATO dimensions. M193 vs M855. 223 Meaning. What is a NATO round? Brief Histories of 223 and 556. Can you …What grain is most effective for the 5.56 ammo? The most common and effective grain for 5.56 ammo is 55 grain. This is the standard weight for the majority of 5.56 ammunition on the market. What is the 5.56 ammo used for? The 5.56 ammo is commonly used in military and law enforcement rifles, as well as by civilians for sporting and hunting ...

Feb 16, 2024 · The effective range of an AR-15 5.56 rifle typically varies between 400 to 600 yards, depending on factors like barrel length, ammunition type, and shooter skill. However, the weapon itself can technically shoot much farther, reaching distances of up to 3,000 yards, albeit with significantly reduced accuracy. Aug 7, 2021 · Standard Pistol Calibers. Standard defensive pistol calibers like 9mm, .40 S&W, and .45 ACP excel in the 0- to 25-yard range with a rough effective range of 50-yards or so. Popular 9mm Ammo. Sure, people can hit targets further than this, but it’s uncommon, to say the least. Typical factory loads for 5.56 range between 35 and 77 grains, however the 55 gr and 62 gr are the most common. Ammo for the 6.8 SPC can range between 75 and 120 grains, …The effective range of 5.56 ammo depends on the weapon system, the bullet type, and the muzzle velocity. For military use, the range is usually 547 to 875 yards, while for hunting, it is 220 to 300 …When it comes to the .223 and a 5.56, most users will generally operate under 250 yards. We don’t really need to talk about the nuances of those cartridges at that range because at that range the following is possible with those cartridges: Stopping a defensive threat of any human size.

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May 25, 2021 ... ... 5.56 vs .308 2:33 Ammo Color Designations 3:12 Classic vs Modern Applications 3:24 COLT XM16E1 (5.56) ... What Is The Effective Range Of 7.62x39?Given a good quality 20 inch .223/5.56 barrel in good condition. and given no scope limitations and favorable weather conditions. also given a reasonably good shooter who practices about monthly. using 75 or 77 grain match quality ammo with a …AR9 vs AR15 effective range. Imagine both barrels are 7-10". My friend is telling me that the AR15 (5.56) is far better. In general yes, but I imagine the effective range of both guns to be the same. 50-100 yards depending on ammo selection. Plus, I can suppress the AR9, its cheaper to run, and easier on the recoil for the women.The effective range doesn’t mean the bullet fire with max damage. It means a distance at which the bullet hit at high accuracy. You can understand with an example that .45 ACP and 9mm bullet has a stopping power so it drops faster than standard ar-15 rifle round. On the other side, 5.56 ammo can hit a distance of 600 meters but it is ...

All-Purpose Barrels: 16-inch & 14.5-inch. Far and away the most popular barrel length for an AR-15 is 16″. This medium length offers very capable ballistics, with a maximum range exceeding 500 yards, and in some cases quite a bit further, although that will depend upon factors beyond barrel length. Despite their considerable range, 16 ...The domain of a circle is the X coordinate of the center of the circle plus and minus the radius of the circle. The range of a circle is the Y coordinate of the center of the circl...Aug 31, 2012 · The advertised maximum effective range of both the M14 with a 150 gr., 7.62 mm NATO cartridge and the M16’s 62 gr., 5.56 mm M855 NATO cartridge was 460 meters. This equal clas-sification is odd considering the dramatic difference in cartridges. “Effective” is the key word. In this instance, it denotes the maximum range a projectile is ... The round must be suitable for close- and medium-range conflicts, such as house-to-house urban engagements. Likewise, it must function properly in long-range environments, such as those found in the mountains of Afghanistan. ... “The 5.56 is very good for that.” ... the 5 56 round was marginal from the get-go! Tales of US troops …The United States Trade Representative's Office told Reuters it anticipates the effective date will be in approximately 90 days. ... will increase from the current range of …The effective range of 5.56 ammo depends on the weapon system, the bullet type, and the muzzle velocity. For military use, the range is usually 547 to 875 yards, while for hunting, it is 220 to 300 ft-lbs. Learn more about the factors that affect the effective range of 5.56 ammo and the differences between point target and area target range.5.56 NATO Load Comparison: The 55-Grain Shuffle. When it comes to .223 Rem/5.56 NATO ammunition, 55-grain FMJ is far and away the most popular load used by semi-auto rifle shooters. Thankfully, it ...The heavier duty 7.62 NATO is still used in the military due to the extra power and range it offers. An M14 hard at work in Afghanistan. When comparing the 5.56 M885A1 load and the 7.62 NATO M80 round, we see the big differences upfront. 7.62 retains over 1,700 foot-pounds of energy at 500-yards versus 5.56 which hits 950 foot-pounds at 500-yards.Let's see what traders could do now....RRC Range Resources (RRC) was raised to a "buy" recommendation at Mizuho Securities. Let's check out the charts of this independent natur...The velocity range to look for in 5.56 ammo is generally between 3,000 to 3,300 feet per second for optimal performance. See 3,000+ New Gun Deals HERE What are some popular uses for 5.56 ammo?A fast, 40 grain .22lr has 183 ft. lbs. of energy at the muzzle. That energy equates to about about 1,250 fps for a 55 grain .223. A 10.5" barrel shooting XM193 might develop 2,700 fps at the muzzle. By 350 yards, XM193 from that barrel will be roughly equivalent to point blank .22lr, and that's being generous with the numbers.

When shooting the 55 grain 5.56 full metal jacket ammunition, the effective range is about 500 yards, before the shooter needs to apply significant holdover or loss of ballistic energy. The 16" barrel, being slightly longer, provides a muzzle velocity of 2800 ft/sec, which is about 50 ft/sec faster than the 2750 ft/sec achieved with the 14.5 ...

And again, it is interesting to compare these two cartridges as the rounds move past the 100 yard mark. As they continue, the 7.62×39 rounds tend to lose energy at a much higher rate than the 5.56×45 rounds. From 200 yards out to 1,000 yards, there is less than 100ft.lbs difference between 5.56×45 Vs 7.62×39 averages.The max effective range for a 5.56 in Vietnam when establishing a defensive position was 300 yds for a good reason. Another words when the bad guys are 300 yds out that is when the 5.56 rifleman engaged them. Current issue ammo has greater reach, true, but not much. Before I retired the need for an effective round for ranges greater than that ...The 308 is better suited for hunting larger game like white tail deer and other big game due to its stopping power and effective range. The 5.56 NATO, while effective for smaller game and varmint hunting, might not be the best choice for larger game due to its lower muzzle energy. Tactical and Home Defense Use. In tactical and home defense ...Feb 19, 2024 · The effective range of 5.56×45 for hunting is generally around 200-300 yards, depending on the specific load and the shooter’s skill level. Is 5.56×45 suitable for hunting larger game? While some hunters have successfully taken down larger game with 5.56×45, it is generally considered best for small to medium-sized game. 5.56 NATO beats 6.5 Grendel when it comes to bullet drop within 500 yards. It falls about 10% less. 5.56 NATO's max effective range is about 450 yards, although its only lethal up to 300 yards. 6.5 Grendel's max effective range is about 800 yards. It can be used to hunt up to 500 yards.The Toyota bZ4X, the first electric vehicle under the automaker’s new bZ brand, will come to the U.S. in mid-2022 with an estimated range of up to 250 miles. The vehicle is nearly ...Nov 29, 2021 · To ensure the 5.56 cartridge can handle the increased pressure, the walls of these cases are slightly thicker than their .223 counterparts. The hotter loads in the 5.56 result in higher pressure levels of approximately 58,000 psi. For comparison, .223 cartridges are loaded to approximately 55,000 psi. A good in between would be a red dot and flip over magnification. Or maybe a 3-9 scope with quick zoom capabilities. ... and to those that insist that a long barrel is necessary to squeeze every yards of range out of the rifle, a 24" barrel, starting out with about 250ft/s more velocity will hit the sound barrier at 1000 yards. So all the other ...However, it has an effective range of about 600 yards and retains enough velocity to be used for 1,000-yard targets with a good rifle in the right hands. The standard twist rate for 5.56 NATO chambered rifles is 1:7. A barrel length of 16 inches is considered ideal for this ammo, however, a wide range of options are available out there.While the 5.56 is not typically considered a “big game” cartridge, it can be effectively used for deer hunting when the right ammunition is selected and shots are …

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The European plane manufacturer is trying to beat Boeing in the mid-market, long-range sector even before Boeing comes out with its own product. In the rivalry between Airbus and B...The maximum range for an AR-15 in 5.56mm with a 20″ barrel is 3900 yards, and its effective range is 600 yards for accurate stopping power. There are several calibers the AR-15 can be chambered in, and each caliber will have a different effective range. Knowing the range of your rifle is critical information that will help you understand ...The domain of a circle is the X coordinate of the center of the circle plus and minus the radius of the circle. The range of a circle is the Y coordinate of the center of the circl...gunmade ... Loading...The effective range of a 5.56 bullet for deer hunting is generally considered to be around 100-200 yards, although this can vary based on the specific ammunition and rifle used. Is a 5.56 bullet suitable for hunting larger game? While a 5.56 bullet can be used for larger game, it is generally recommended to use a larger caliber for animals such ...At close range, the 5.56 vs. 9mm slugs will be able to devastatingly wound your target. Overall accuracy, however, and long-range terminal ballistics will need to be sacrificed for the terminal stopping power of the 9mm bullet. ... If I were to talk sorely on stopping power, the effective range and energy of rifle bullets over handguns is ...It typically has a lower muzzle velocity, resulting in reduced bullet energy and terminal performance. 1. What is subsonic 5.56/.223 ammo? Subsonic 5.56/.223 ammo refers to ammunition designed to travel at speeds below the sound barrier, typically around 1,000 feet per second (fps). 2.AR9 vs AR15 effective range. Imagine both barrels are 7-10". My friend is telling me that the AR15 (5.56) is far better. In general yes, but I imagine the effective range of both guns to be the same. 50-100 yards depending on ammo selection. Plus, I can suppress the AR9, its cheaper to run, and easier on the recoil for the women. ….

The Toyota bZ4X, the first electric vehicle under the automaker’s new bZ brand, will come to the U.S. in mid-2022 with an estimated range of up to 250 miles. The vehicle is nearly ...Effective range can vary, but premium 77 grain hollow point bullets can provide effective hunting performance out to 300 yards or more. Are there specific hunting regulations for using the 5.56? It’s important to check local hunting regulations to ensure that using a 5.56 for hunting is legal in your area.The 308 is better suited for hunting larger game like white tail deer and other big game due to its stopping power and effective range. The 5.56 NATO, while effective for smaller game and varmint hunting, might not be the best choice for larger game due to its lower muzzle energy. Tactical and Home Defense Use. In tactical and home defense ...Dec 13, 2022 ... Wilson Combat•382K views · 16:01. Go to channel · 5.56 & .308 vs 5 gallon water jugs at 300 yards. outdoor adventures•580K views · 17:03. ...According to the technical manual of the US Army, when used with a carbine, the point target range of 5.56 is up to 547 yards, with the target area range being 602 …Compared to M855’s nominal effective range of 150 yards, that’s quite impressive. Point being, while M855 is marginally better than M193 on paper, it’s also not the best 5.56 load available. Whether you’re after maximum range or maximum effect on target, there are many better options than either of these surplus loads.However, it has an effective range of about 600 yards and retains enough velocity to be used for 1,000-yard targets with a good rifle in the right hands. The standard twist rate for 5.56 NATO chambered rifles is 1:7. A barrel length of 16 inches is considered ideal for this ammo, however, a wide range of options are available out there. ...Feb 18, 2024 · What is the effective range of a 5.56 mm rifle? The effective range of a 5.56 mm rifle can vary depending on factors such as the specific rifle, ammunition, and shooter, but it’s typically around 500-600 meters. Are there any restrictions on owning a rifle chambered in 5.56 mm? The 5.56 is easier to control, recoils softer, and makes it easier to rapidly engage targets and put multiple rounds on target. Concussion is a major difference when barrel lengths are compared. A 16 inch 5.56 barrel is much more comfortable than a 16 inch 7.62 NATO. The difference is almost night and day. 5.56 effective range, Time of flight is about 1 second per 300 yards for most subsonics, so at 300 yards the drop is about 16 feet. At 600 yards it's at least 64 feet. Without precision ammo, and a quality rangefinder subsonic shooting at over 300 yards not practical. A subsonic heavy low drag bullet however can be lethal at a mile or more., A good in between would be a red dot and flip over magnification. Or maybe a 3-9 scope with quick zoom capabilities. ... and to those that insist that a long barrel is necessary to squeeze every yards of range out of the rifle, a 24" barrel, starting out with about 250ft/s more velocity will hit the sound barrier at 1000 yards. So all the other ..., And he has a fix. Elon Musk suggested today that “range anxiety”—the malady that afflicts electric car drivers fearing that they will run out of charge in a bad neighborhood, at ni..., Max Range. 20 in. 3100 ft/sec. 600 yards. 18 in. 3050 ft/sec. 500 yards. 16 in. 2800 ft/sec. 500 yards. 14.5 in. 2750 ft/sec. 300 yards. 12.5 in. 2600 ft/sec. 200 yards. 10.5 in. 2500 ft/sec. 200 yards, Kids raised with free-range parenting are taught essential skills so they can enjoy less supervision. But can this approach be harmful? Free-range parenting is a practice that allo..., Jul 20, 2004 · Considering what Ammo Oracle says about the 5.56/.223 round requiring at least 2700fps to garauntee fragmentation, would an expansion-type hollow point or soft tip bullet be more effective out of a 10.5" - 11.5" barrel in a combat situation ? 75gr OTM or 77gr Mk262 work out of an 11" barrel. , 62 gr Ammo Comparison (pictured: M855 also known as SS109 or “green tip” ammo) Before I dive into the test methodology and results, a little background about the M855 cartridge is in order. NATO adopted SS109 around 1980 as the standard 5.56x45mm load. The 62 gr projectile is of Belgian design and uses a closed-nose, copper jacketed, lead core., Time of flight is about 1 second per 300 yards for most subsonics, so at 300 yards the drop is about 16 feet. At 600 yards it's at least 64 feet. Without precision ammo, and a quality rangefinder subsonic shooting at over 300 yards not practical. A subsonic heavy low drag bullet however can be lethal at a mile or more., THE QUICK LIST. Best Overall 5.56 Pick. AAC 5.56 NATO 55gr. Jump to Details. M193 5.56 Pick. PMC X-TAC 55gr. Jump to Details. Best Green Tip 5.56. …, Range Rover vehicles of all different models and years can be equipped with alarm systems. These systems are most often controlled with a handheld remote and can be wirelessly enab..., 62 gr Ammo Comparison (pictured: M855 also known as SS109 or “green tip” ammo) Before I dive into the test methodology and results, a little background about the M855 cartridge is in order. NATO adopted SS109 around 1980 as the standard 5.56x45mm load. The 62 gr projectile is of Belgian design and uses a closed-nose, copper jacketed, lead core., B&M is a popular retail store known for its wide range of products and affordable prices. Whether you’re looking for home decor, garden essentials, or even groceries, B&M has it al..., The 6.5 Grendel boasts a flatter trajectory, longer effective range, and higher energy compared to the 5.56. The 5.56, on the other hand, is known for its lighter recoil, cheaper ammunition cost, and faster follow-up shots. ... At the muzzle, the 223/5.56 bullets shoot down range at a speedy 3,240 fps, while the 6.5 Grendel lags behind at 2,580 ..., Sep 1, 2019 · Maximum Effective Range = furthest distance the weapon can realistically hit a target. 1 - Effective Range - is easy. Find the projectiles expansion/frag velocity, the projectiles BC, and the velocity from the given barrel length. Example: Federal Fusion MSR from a 14.5" barrel = 2,730fps. , The standard Green Tip from a 10.5 is not going to have very effective terminal ballistics at that range, though it will still kill someone if something vital is hit. There are better options for improving terminal effect at those ranges, which is why the Army fields a 14.5 barrel instead of a 10.5 on its general service rifle. 13., What is the maximum effective range of 5.56 self-defense ammo? Most 5.56 self-defense ammo is effective within 100-200 yards, depending on the specific round and firearm. What is terminal performance in 5.56 self-defense ammo? Terminal performance refers to how a bullet expands, penetrates, and transfers energy upon …, Max Effective Range (Estimate) 5.5" 1,780: 24,000: 150-200 yards: 7" 2,330: 17,040: 250 yards: 9" 2,400: 13,565: 300 yards: 11" 2,570: 10,540: 350 yards: 13" 2,645: …, However, it has an effective range of about 600 yards and retains enough velocity to be used for 1,000-yard targets with a good rifle in the right hands. The standard twist rate for 5.56 NATO chambered rifles is 1:7. A barrel length of 16 inches is considered ideal for this ammo, however, a wide range of options are available out there., Effective range can vary, but premium 77 grain hollow point bullets can provide effective hunting performance out to 300 yards or more. Are there specific hunting regulations for using the 5.56? It’s important to check local hunting regulations to ensure that using a 5.56 for hunting is legal in your area., When shooting the 55 grain 5.56 full metal jacket ammunition, the effective range is about 500 yards, before the shooter needs to apply significant holdover or loss of ballistic energy. The 16" barrel, being slightly longer, provides a muzzle velocity of 2800 …, If you’re in the market for a new range, you might be overwhelmed by the numerous options available. One option that has gained popularity in recent years is an induction range wit..., 2302 posts · Joined 2021. #1 · Oct 10, 2023. I finally bought a 11.5” 5.56 MCX upper for my MCX lower that was sitting in my safe. Now it’s a complete SBR ready to rock n roll. I think the 11.5” is just about the perfect length for me. I haven’t taken it to the range yet but it feels a lot lighter and more maneuverable than my 16” MCX., Jul 27, 2022 ... Comments568 ; The .45 acp Ruger LC Carbine | It Keeps Getting Better. Colion Noir · 277K views ; What Is The Effective Range Of 5.56?, Aug 31, 2012 · The advertised maximum effective range of both the M14 with a 150 gr., 7.62 mm NATO cartridge and the M16’s 62 gr., 5.56 mm M855 NATO cartridge was 460 meters. This equal clas-sification is odd considering the dramatic difference in cartridges. “Effective” is the key word. In this instance, it denotes the maximum range a projectile is ... , Effective Range of 5.56. The effective range of the 5.56×45, a military/NATO cartridge, is a critical factor in its tactical deployment and operational capabilities, as detailed in the US Army Technical Manual 9-1005-319-10.. When assessing the effectiveness of a cartridge in military operations, the range plays a pivotal role in determining its usability in various …, While the 5.56 is not typically considered a “big game” cartridge, it can be effectively used for deer hunting when the right ammunition is selected and shots are …, Its popularity shows just how effective it is… Federal’s 5.56×45 caliber, 55 grain round is one of the most popular solutions for AR-15 range training use. It is manufactured to the same specs as the M193 U.S. Armed Forces ammo. The ‘X’ designation simply means it is for civilian use. The bullet does not contain steel and is …, The 5.56 is easier to control, recoils softer, and makes it easier to rapidly engage targets and put multiple rounds on target. Concussion is a major difference when barrel lengths are compared. A 16 inch 5.56 barrel is much more comfortable than a 16 inch 7.62 NATO. The difference is almost night and day., Still, a typical 16" barrel with 1-in-7 twist rate (for heavier bullets) and a suppressor of your choosing should work acceptably well overall and still retain a lot more energy than a .22 LR. Likewise, a handier barrel in the 10-inch range and a typical 6-7" suppressor should also be a good setup for a pistol or SBR build., For example, at 400 yards, a fairly average 62-grain 5.56 NATO bullet will have dropped around two feet. By comparison, at the same distance, a middle-of-the-road 123gr 7.62×39 bullet will have dropped over 44”, or nearly twice as much as its NATO counterpart. Where the 7.62 comes back into its own is when we do the math on the …, AR9 vs AR15 effective range. Imagine both barrels are 7-10". My friend is telling me that the AR15 (5.56) is far better. In general yes, but I imagine the effective range of both guns to be the same. 50-100 yards depending on ammo selection. Plus, I can suppress the AR9, its cheaper to run, and easier on the recoil for the women., If you're a wok enthusiast who rents your home or apartment you won't have a lot of say in what kind of range is in your kitchen. If you have a gas range your wok ring will usually..., And again, it is interesting to compare these two cartridges as the rounds move past the 100 yard mark. As they continue, the 7.62×39 rounds tend to lose energy at a much higher rate than the 5.56×45 rounds. From 200 yards out to 1,000 yards, there is less than 100ft.lbs difference between 5.56×45 Vs 7.62×39 averages.