AR-15 long range?

[Kola16]

I have really been looking forward to getting an ar I am also looking at building my own to save  , but I was wondering a couple things; how tight of a group could it shoot at 600 yards, 800, or is that flat out to far? And how big of a difference would the groups be between a 16, 20, or 22 inch barrel. This will all be in .308.

[vmkeith]

Doing a quick google search, I happened across this post from thehighroad.org.  Take it for what it's worth...BTW, I did edit out some of the useless junk to avoid confusion.

The rule of thumb is to reduce muzzle velocity by ~100fps/1" bbl length that you cut off (if I recall correctly). Assuming a 150gr. bullet with a BC of .314, fired from a 24"bbl...MV = ~ 2820fps for an average factory loading. Reducing that with the rule of thumb gives you roughly 2420fps and 2020fps for 20" and 16" respectively. I would estimate around 800 yds for the 20" and 500yds for the 16".

[h20hunter]

I have a stock Bushmaster and have a basic 3x9. I have taken it out to the 500 yard range once shooting 55 gr varmit tip rounds. Took a few rounds to get where I wanted to go and had no problem hitting the 10 ring which was about 12 inches. About half my shots in the 10 ring were in the inner "x" ring. They flat out shoot. People that are much better shooters than I, which is many, can do better. I watched one guy with stock sights do the same from 200, 300, and 500 from prone, sitting, and standing. Now that boy could shoot.

[Kola16]

Thanks vmkeith that is exactly what I was looking for

[demontang]

Do you mean ar10 or an ar15 in a new .308cal round? As for accuracy and barrel lenght you will only notice a difference when the bullet loose speed and destabilizes 

[Kola16]

Do you mean ar10 or an ar15 in a new .308cal round? As for accuracy and barrel lenght you will only notice a difference when the bullet loose speed and destabilizes

I mean ar-15. I know it is not common, but they are around. The reason I want .308 is because I want to take it deer, bear, and elk hunting if I get tired of shooting at long targets (I don't have intentions of shooting an animal at to far of a distance). If there i a better round that you know about that I should be using feel free to tell me.

[vmkeith]

Do you mean ar10 or an ar15 in a new .308cal round? As for accuracy and barrel lenght you will only notice a difference when the bullet loose speed and destabilizes

I mean ar-15. I know it is not common, but they are around. The reason I want .308 is because I want to take it deer, bear, and elk hunting if I get tired of shooting at long targets (I don't have intentions of shooting an animal at to far of a distance). If there i a better round that you know about that I should be using feel free to tell me.

.308 is an AR10 platform, and haven't heard of the .308 adapted to the AR15...unless you are talking about the .30 Remington AR.  If you wanna stay with the AR15 platform, looking at the 6.8mm SPC, 7.62x39, .450 Bushmaster, .458 SOCOM.

[addicted]

they look the same kola ar15, and ar10. just the ones set up for 308, 7mm08, 338federal, .243 are designated AR10.

[addicted]

whats your name kola?

[Kola16]

Kola is my black labs name. I not gonna tell you my name, yet. When I said ar-15 in .308, I was thinking about remington's r-15 and r-25 Thanks for clearing that up. Would a .450 be a good long range round and also a big game round AR-10 is fine with me to.

[h20hunter]

I don't think you are going to get much range out of the .450 or the .50 beawolf. However, in close, maybe hunting hogs, up north baiting bears under 100 yards, sure, I could see that.

[h20hunter]

here is a bit of info:

[Kola16]

I guess I am going with the AR-10. I kinda wanna shoot targets a long ways away. Can you find uppers and lowers and stuff for an ar-10 like a 15, or should I try something like a AR-25? Apperantly I need to reaserch it more cause I didn't even know that the ar-15 did not shoot .308 rounds.

[h20hunter]

You should be able to swap out upper on one platform. You could have an upper in .22, .223, .308, and .450 to cover just about every application.

[Kola16]

Well I think I will do a little more reaserch on the subject, but that is good to know. I am actually watching a show right know on the sportsmans channel that is using an ar to hunt antelope.