I guess I wouldn't agree when you consider cost and range. Remember we are buying .223 from US companies, really bolt action long gun ammo, out of a 14.5" or 16" these JHP's have such lower KE than Xm193 or M885 that I really question their being superior especially outside 100 yards.
Since 55gr to 62gr FMJ loads turn into icepicks below about 2700 ft/sec per Fackler et al, it is at range that that civilian JHP/SP show the biggest benefit vs. 55-62gr FMJ, IMO, particularly vs. M855. Out of a 14.5" barrel, M855 drops below the 2700 ft/sec threshold after only 60 yards or so, since it's 2900 or slower at the muzzle; a civilian-length 16" barrel might stretch that beyond 100 yards, but probably not far beyond. Civilian JHP/SP hunting and LE loads, on the other hand, are
not dependent on yaw-induced fragmentation as the sole means of upset, and will expand down to 2200-2300 ft/sec or less. Meaning civilian JHP/SP will be expanding at ranges far beyond those at which M855 is capable of of fragmenting.
Remember, .223 is not only one of the most commonly used 200-300 yard predator and varmint hunting cartridges in the civilian world, but it's also one of the primary rifle rounds used by law enforcement in the United States. There has been a *lot* of attention paid to .223 JHP/SP design and a lot of assessment in the LE wound ballistics literature, and the consensus by far is that JHP/SP is superior to FMJ for LE and other civilian use.
If you want civilian loads as hot as milspec, they are certainly out there; I linked to Federal's selection primarily because they are some of the most accessible charts online.
Look at it this way: take the best .223 commercial ammo under 75 cents per round and at 150 yards it really ain't no better than M855.
M855 isn't fragmenting at all at 150+ yards out of a 16" or shorter barrel, whereas civilian JHP/SP is will be expanding well beyond that distance. Remember, JHP/SP will expand at velocities way below the M855 fragmentation threshold.
M855 was designed specifically to poke clean .22 caliber holes in Warsaw pact steel helmets at 600 meters when fired out of a 20" barrel, which I'm sure it does very well. Fragmentation and terminal performance weren't design criteria for M855, though, unlike Mk 262, Mk 318, or civilian LE or hunting loads.
If you want to spend the money on 75g TAP or BH 77g HPBT's, well then you have an advantage over an AK if you also have an expensive SPR barrel, a very expensive 1-4 scope, and years of training to make those crazy 300+ yard shots.
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I think it comes down to budget. For an AR to truly outperform an AK (yes it can) you have to spend a lot of money on the special ammo, the expensive magnification, and years of practice/training. If you have limited time and budget I think an AK will serve just as well as an AR.
If you can afford the ~$1 per round accurate 70+ grain ammo, a quality 1-4x scope (talking $2k scopes), and practice for months at 300+ yards, then by all means get a $1200 recce or spr.
It doesn't take an SPR-grade barrel, $2000 4x scope, and $20/box ammo to make consistent 300-400 yard hits with a .223, any more than it takes a $100,000 sports car to exceed 90 mph. To consistently hit at 700 yards, yes, you need more than a rack-grade AR; to hit at 400 yards, no.
Plenty of military quals with the M16/M4 involve shooting at 300+ yards with iron sights and plain milspec FMJ. With a red dot or Eotech, it's easier than with irons; if you can see the target, you can hit it, given a stable shooting position, until the range increases to the point that range estimation becomes a major factor. And *anywhere* within that range envelope, from 5 yards to 500, good civilian loads will exceed the terminal performance of M855, as will Mk 262 and Mk 318. Where civilian loads fall down vs. M855 is in cover penetration at longer ranges, which is M855's forte. As the range increases, you'd probably want to go with a heavier round with a higher BC than the lighter 55gr bullets (the 69gr to 77gr loads really start to eclipse 55gr beyond 300 yards or so) but you can certainly do better than M855, whether you're looking at civilian or military loads.
And making 300-400 yard shots with an AR *is* easier than with a 7.62x39mm AK. Out of the box, pretty much any civilian AR should be able to hold 6" groups at 300 yards, or better, with decent ammunition and a stable shooting position. With my 7.62x39mm AK, 200 yards is about my limit for keeping 8M3 on an IPSC silhouette. I'd probably do better at range with a 5.45mm AK (less dispersion, less drop) but my experience is limited to 7.62x39mm.
Otherwise a 25 cent per round wolf hollow point classic 7.62x39 is just going to plain outperform any 75 cent or under non-Nato .223 round especially in the 100 to 200 yard range.
Inside 200 yards, yes, I agree. Within that distance, civilian 7.62x39mm 8M3 JHP or Hornady VMAX performs every bit as well as any 5.56x45mm load. Push the range back to 300, 400, or 500 yards, though, and 69-77gr .223's better ballistic coefficient and flatter trajectory starts to trump the 7.62x39mm's greater frontal area. By 400 yards, 7.62x39mm 8M3 velocity has dropped below 1300 ft/sec and the trajectory has fallen off the table, and at 500 yards it would take pretty accurate range estimation to even hit the target with 7.62x39mm.
And of course if you're talking about Warsaw Pact spec M43 military FMJ or "cosmetic" JHP (e.g. Wolf black-box, Tula, etc.), rather than now-hard-to-find 8M3 or expensive VMAX, most civilian .223 would outperform it at any range in any role.
Where the AR shines is ergonomics, buy a tax stamp and build a 12.5"-14.5" lightweight pencil AR with a micro RD, and stock up on XM193/XM885. A much bigger investment than a SLG AK, but ergonomics can be priceless in a life or death situation.
In my opinion, a super-short barrel shooting M855 is the worst-case scenario for the AR. Out of very short barrels M855 won't fragment at *any* range, and gas systems much shorter than carbine length start to get finicky due to pressure/timing/dwell issues. That's the case in which the AK/AR comparison comes out most in favor of the AK, IMO; the 7.62x39mm AK loses a lot less going to a short barrel/short gas system than the AR does.
And in my somewhat limited experience (having shot both an AK and an AR in USPSA) AK ergonomics aren't bad except for the safety/selector placement. An on-safe AK is slower to get running than an on-safe AR, and of course if you want to flick the safety off/on/off/on all the time like some schools teach with an AR, you will have a very hard time with an AK. But AK charging, reloads, malfunction clearance, etc. aren't bad, in my opinion, as long as you do them with the supporting hand rather than the firing hand.