5.56 Vs. 6.8 SPC Vs. 7.62




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SmokeRingsPipeDreams: Someone found in K-Berg's house at night, will be found there in the morning!

michael malkowski: Try the 5.56 with something other than an FMJ round. Something that expands will give a much better impact. That being said, the 7.62x51 has double the muzzle energy of the 5.56 and is only going 300 fps slower with a bullet 130% heavier than the 5.56.

Southlander1000: All great platforms. I enjoyed watching this. It just reminds me that when I need real knockdown power (for elk and moose, etc), I go for my FN FAL. I used it on a deer with 165 gr. Hornady SST and it blew in one shoulder blade, through both lungs, and out the other shoulder blade at 125 yards. I decided I needed something with less over penetration value, so I ordered a DSArms ZM4 in .300 AAC Blackout. Can't wait to try it out -- with and without the can.

kenny johnson: Each round was designed for a different purpose You really can't do a legitimate comparison. 

MrAristes: Thanks for the video! I have both a 5.56/.223 build and a 6.8 build near completion. I'm familiar with 5.56 but not 6.8. I can't wait to see what 6.8 is like. Entertaining video, really makes me want an AR-10 also. On a side note, I couldn't decide if your face reminds me more of Lou Ferrigno or Vitor Belfort so I've decided to think of you as Lou Belfort, friend of all 2A supporters:) Thanks!

allMTN: I'm from the same part of the country... actually, the other dude in this video grew up knowing Jon Cena's little brother.

allMTN: Thanks man. Always looking to improve...

WinchesterRanger: I still find the 7.62x39mm round to be the best compromise under 300 yards.

SalveMonesvol: I just hope you are a kid. Momentum is mass times speed, energy is 1/2 mass x speed¨2. A slow bullet like a .45 has relatively high momentum compared to it's kinetic energy, while a fast light bullet like the 5.56 has a very high amount of kinetic energy and little momentum.

Armory52: @allmtn. I agree muzzle flip looks like its decreased but does it actually make the gun louder like ive read or is that bs

ThorsThunderHorse: Not one of these have a sector switch to change rate of fire so by military standard they are not assault rifles. The Clinton regime has brain washed to many people. And non of my contacts in the ATF will call a civilian AR (armalight) rifle an assault rifle.

jason jones: Still love watching this video

Ryan Hughes: Wait did 5.56, 6.8, and 7.62 exit the book?

Anthony Cashe: Since your so informed, why did you watch his video??? Post your own vid or stfu....

allMTN: We tried to avoid getting into detailed specs, because those can be easily found on Wikipedia, etc. Plus, there's a lot to cover on that. Might do another video in the future with more detail, but will probably replace the 6.8 with .300 AAC Blackout... Love that cartridge.

Gregory Bryson: So that's what I should do w/ all those MSC catalogs I have lying around...

A7Delgado: Thanks I appreciate the it. And that 2 to the chest 1 to the head was ridiculous!

allMTN: Thanks for the comment. We should have a few more videos coming soon.

bp968: BTW, what ammo did you use that produced so much smoke? The x51 isn't any more fouling then 556 or 6.8. If you roll your own or used LC (which is impossible to find now) its just fine and much less smoke then you had there.

allMTN: Each of these rifles has high capacity detachable magazines, a threaded barrel with muzzle device that hides flash and/or reduces recoil, and a telescoping butt stock. According to the Bureau of Alcohol, Tobacco and Firearms, any one of those elements qualifies a firearm as being an assault rifle. So, technically, you saw 3 assault rifles.

sirmicro: 6.8 all the way.

CPHannigan: Currently, the military has dropped all use of the 6.8 SPC. It is a great round within 400m, light recoil, accurate, reliable, and all around well designed. The only down fall is the logistical problem the cartridge presents to NATO. If the U.S. military switched to it, what would the rest of NATO do? I think it's best for us to stay with the 5.56 NATO for the time being.

bp968: In a gas gun, in semi auto, the 762x51 us plenty controllable for a guy that size. The real issue (was) ammo quantity. We Changed weapons and wars about the same time. We went from "if your shooting something over 300 yards away, call in arty" to a mostly infantry (or mounted infantry) war(s). Now we are full circle back to wishing we had the hitting power and range of x51. Its hard to not recommend 5.56 to someone simply because its so much cheaper to train with.

MullitudeDude: Would of liked to see 7.62x39 Ar in the mix..AR 10 is a beast!!! Cost of ammo though

Crysium Artek: 6.8 mm velocity and power..why not all guns use 6.8 ?..it is special USa guns ?

rkrzbk: If I'm not putting a suppressor on it, and have a 16"+ barrel, I'd rather buy a dedicated 7.62x39 upper.

allMTN: You'd be correct if the 7.62 cartridge we were testing was the 7.62 X 39 (AK-47 round), but this is the 7.62 X 51 NATO, which is more accurate, less affected by wind, and has greater effective range than both the 7.62 X 39 and the 5.56 X 45, as well as the 6.8.

Recon WB: i doubt he lived to, but he didn't die immediately, he could still pick up a gun, and shoot back

allMTN: I'm not sure I'd call 5.56mm "spray and pray", the AR-15 is generally 2.0 MOA or better... extremely accurate out to 500m, as is the 6.8. 6.8 is definitely a great hunting round, as you say.

allMTN: Why would you look up NFA ban, that is not what constitutes an assault rifle?... You would be correct if you said that these weapons are not NFA banned... they aren't. But they meet SEVERAL of the ATF's criteria, any one of which constitutes an assault weapon. (Detachable mag, threaded barrel, telescoping stock, foregrip, a muzzle brake). I was just reading on the ATF website yesterday about importing "semiautomatic assault weapons"... their language. According to you, there's no such thing?

allMTN: haha.. Yeah, lots of comments from folks wanting us to throw that in the mix for the next video. The 6.8 is gone and we have a .300 AAC Blackout instead, but still don't have an AR chambered in 6.5 Grendel. 6.8 SPC and 6.5 Grendel are somewhat similar, but the 6.5 Grendel has some advantages over the 6.8 when it comes to long range shooting. Good cartridge, though, wouldn't mind having one. Thanks for the comment!

allMTN: But look at what I was replying to: .458 SOCOM. Compared to .300 BLK, .458 SOCOM is the unicorn, by far. You're right, currently .300 BLK (and .300 Whisper) is tough to find and pricey. I'm running my 5.56's and .308 ARs at the range until things normalize again, no doubt, but my home defense AR is still a .300 BLK with a mag full of Hornady .300 Whisper 110gr V-Max.

allMTN: Absolutely, and thanks for commenting. There is a lot of information out there, both good and bad, about firearms and calibers, from a lot of different sources ranging from ballistic testing to video games... it can be tough to sift through it all. Ultimately, a modern high-velocity boat-tail cartridge is a catastrophic projectile, even in full metal jacket. In JHP, or soft or ballistic tip, the ballistic effects are compounded. And, as you say, you can't go wrong with big bore! ; )

JackedRado71: That's that crap right there! Excellent shooting technique and safety practices as well

allMTN: I appreciate the M14, for sure, but there really is nothing left that an M14 does better than a modern, quality gas-piston AR chambered in 7.62X51. The AR platform has come a very long way. Capacity, accuracy, weight, muzzle control and reliability have all tipped. That's not a knock on the M14 at all (it was used years after it's decommission by sniper teams), but the SR-25 and P308 are examples of possibly the perfect all around big-bore battle rifles.

SpeedbyTim: Good job Sir. Looks like some pretty good muzzle control on all three rifles. Keep the vids coming.

Christopher Morris: The 6.8mm SPC is an excellent "in between" type of round. It's too bad that the military can't afford to upgrade all their rifles to this caliber. Is the military at least using this on a limited basis?

therichardking4242: What about the 6.5 Grendel?

allMTN: Cool round, just incredibly expensive and tough to find ammo. .300 BLK is more versatile and practical, but SOCOM is definitely a sledgehammer.

allMTN: The reason for the amount of smoke was the muzzle brake... I was using factory Federal loads, but the muzzle brake directs a tremendous amount of the blast back towards the shooter and it tends to linger more. If I had just a flash suppressor, most of the blast would be directed further downrange and be more dispersed.

alielbaryeshua: FYI: The ATF definition of an assault rifle is one thats fully automatic. So if your rifles are semi-auto, its still semi-auto.

407ForRent: What trigger in he running in the 5.56?

Paladin19able: Most any rifle is "spray and pray if you go full auto. But few people actually own select fire rifles. And don't realize that you can throw a long barrel upper on there and reach out and touch a target.

allMTN: Well, while we're being honest, very few combatants have extensive experience (ie, multiple kills) with EACH of these calibers in identical circumstances. Furthermore, this video covered the differences in felt recoil for all 3 from two different ~200 lb shooters using M.R. shooting stance, the speed and accuracy of quick CQB followup shots, and showed side-by-side energy delivery and expansion on identical targets. There are plenty of ballistics gel videos out there, why do another one?

Solid Kenji: please forgive me if i say some crap considering that I love and study about guns however in my country I just can´t have it now... so I´ve never shot in my life... but I have studied a lot... about the comment... I would say that ACR is a fantastic weapon in a combat situation considering that you can use 6.8 and if you´re ammo out you can adapt it to 7.62...

circacheese: 2:35 .308... lol

allMTN: I think 6.8 and .300BLK are good options for hog and deer in an AR. .308 will obviously do the job, but might be overkill, and it'd be heavy to lug around.

Kyle B: .300 blackout is almost impossible to find right now and is extremely expensive. more expensive than match grade .308

Guns & Games: Thanks.

Recon WB: the biggest issue for me with is that the 5.56 doesn't have much stopping power, yes it's speed gives it roughly as much energy as the slower, heavier rounds, but it has a tendency to pass through the target without delivering as much energy (unless it tumbles.) one of my friends i know who went to afghanistan shot a guy 9 times the m16 5.56, but the guy got up and ran off, that is far less likely to happen with a heavier round. in a life/death struggle, give me a 7.62
Rating:
5.56 vs. 6.8 SPC vs. 7.62 4.7 out of 5

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5.56 vs. 6.8 SPC vs. 7.62