It begs the question

[battleship]

It seems you can get a AR build in just about any caliber these days - 223/556 - 7.62x39 - 308 - 6.8.

So which one is the most accurate at say a 200 yards, in a test where there is no wind resistence other than the air, the bullet has to part as it travels down to its target.

Does this have more to do with the make/ brand of the bullet than the actual rifle.

Or is it just down to the caliber and how it is effected in flight.

I ask this because i have the AR in a 7.62x39 mm caliber build it seems very potent at 100 yards but im not sure whats happening with the inflight bullet beyound this range, im aware that the 223/556 is a smaller but much faster bullet, but in a test hitting a target at 200 yards, which one is going to be the most bang on accurate, how does the mighty 308 fare when fired from this style of weapon, is it more guts than actuall glory of making its target.

im thinking my next AR will be a 223/556 build versus the 308 or the new 6.8 which looks to be expensive when it comes to the ammo.

AS this will be my 2nd black rifle im considering buying the sig 556 over another AR build just to have something different. and wanted to get some feed back on my questions, before changing calibers and possible rifles.

[dfletcher]

You forgot about the 260 Remington.

No wind? I'd say it comes down to the shooter, the quality of his reloads and his rifle.

The Sig 556 is a great rifle by the way. I was surprised at the accuracy, albeit at only 100 yards.

[M. Sage]

Quality of the shooter, the sights/optics, barrel, bullets, load quality, trigger....

7.62x39mm is effective to 300m, possibly more if you get a more accurate system than an AK with cheap commie ammo.

[ivanimal]

I have heard the 6.5 Grendel is king of accuracy among the varmint crowd that own and load for them.

Lets not forget the 6.5 Creedmore, not much info on this yet but it looks to be a burner.

http://accurateshooter.wordpress.com/2007/11/07/hornady-introduces-new-65-creedmoor-cartridge/

[bubbaskyjacker]

you forgot .22lr. that gets my vote.

[Josh3239]

If I had to guess I'd say a 308 or a 6.8

[battleship]

This is purely from an AR BUILD stand point not looking to take down a sierra mountain goat from a thousand yards while balanceing on the tip of mount whitney. I know most of you guys have a lot of high powered rifles that could unbalance any goat, but this is just about making the kill at the local range with some good grouping. and with an AR. but thanks for the rest of your imput. unless what your saying is that you can build an AR that will cover all of the suggested calibers that you put forth.

[m98]

for pinpoint accuracy in the ar-15 platform go 223-1:8 or 1:7 twist/6.5grendel/the wssm line/ 6mm ppc's. for ar-10 platform go 6.5wsm/260 rem./6.5creedmoore/308


the 7.62 russian just don't have all the guts for printing groups that covers dimes. it was never born to perform such task. good for going bang, bang,bang though at random targets-cans,melons etc.

[battleship]

Thanks M98 and everyone else who responded.

[NorthOfTheCity]

7.62x39mm is effective to 300m, possibly more if you get a more accurate system than an AK with cheap commie ammo.

How about a Robinson Arms XCR? A little expensive, but the platform is far more accurate than an AK. It comes in 5.56, 6.5, 6.8 and now 7.62x39.

http://www.robarm.com/

http://en.wikipedia.org/wiki/Robinson_Arms_XCR

[warpath]

6.5 grendel has accuracy and knock down power past 100 yards

[trinydex]

i tried to find as much as i could and i from what i read reviews wise (which are always glowing and beaming) the sig556 with premiums blackhills still only managed barely 1moa.

there are definitely ars in .223/5.56 that can do much better than that.

1 moa is like mor ethan a quarter at 100 yards. most ar target pics that people show (which are of course the good ones) are like dime size.

6.5 grendel has accuracy and knock down power past 100 yards

isn't the grendal supposed to reach out further than .223 can?




i looked on thr a while back for sournces of 7.62x39 match grade ammo and it's pretty much hard to find. in one thread they recommended that if you reload you can buy the lapua brass and get target bullets, but there's not really a good commercial solution.

comparatively companies like blackhills etc make premium loads for 223 and 308 and these are very common and easy to find both commercially and for reloading.

[ldivinag]

how about a 26" barrel in .338 LM variant...

[emc002]

The AR10s are more compatible with the established (and upcoming) long distance rounds.
The My next build is an AR10 in .260 Remington based on another thread here and some of the links provided as to it's accuracy for long distances.
6.5 Creedmore was a close second choice, but availability of brass was the decider for me.

If you're thinking of building an AR15, not an AR10, I'd go with 6.5 Grendel.