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AR15 1:10 best reload

 
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  #8  
Old 04-12-2011, 04:07 PM
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Re: AR15 1:10 best reload

BigSkyGP,

A 1x7" is actually what the gov. uses in issue M16/M4s etc., and that's based primarily around the need to shoot the tracer rounds, which are REALLY long. The standard M855/SS109 round will do pretty well out of a 1x9", and I suspect would also probably work out of a 1x10". Haven't tried them in one, but I'm pretty sure they'd stablize.

As far as the lighter bullets go, no problem at all. I've seen the term "overstabilized" get tossed around a bit here, but technically, there's no such thing. Spinning a bullet faster than is needed to achieve stability will accentuate any problems with jacket concentricity and MAY open groups. Assuming you're using good quality bullets with decently concentric jackets, they should shoot just fine out of a faster twist. Done so in many tests, but that was using good qulity stuff to begin with, so there wasn't much to magnify in terms of error.
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  #9  
Old 04-13-2011, 06:47 AM
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Re: AR15 1:10 best reload

What is the best bullet for the 1/7.5 twist in a 20" barrel for the .223?
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  #10  
Old 04-13-2011, 09:11 AM
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Re: AR15 1:10 best reload

Quote:
Originally Posted by Capt Academy View Post
What is the best bullet for the 1/7.5 twist in a 20" barrel for the .223?
There's really no such thing, at least, based on twist alone. There's just what your particular rifle has an affinity for, and you take it from there. With a 7.5" twist, you'll be able to stabillize anything up to the 80s, 82s or thereabouts. Won't be able to use the 90s, and personally, I don't consider that to be much of a loss; they're a pain to deal with, for the most part. Anything lighter, no problem. Assuming you're using a good bullet that doesn't have jacket concentricity issues, you can shoot the little 40 grainers just as well as a much slower twist. Anything in the 50, 55, 60, etc., range, no problem.

Now the real choice of best bullet is going to come down to what you're doing with it, what are you using it for? Punching paper means a target bullet. Big game means a much more stoutly constructed hunting bullet, and varminting means something frangible. It's all about matching the bullet to the task you want to perform.
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  #11  
Old 04-13-2011, 05:39 PM
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Re: AR15 1:10 best reload

Quote:
Originally Posted by Kevin Thomas View Post
BigSkyGP,

A 1x7" is actually what the gov. uses in issue M16/M4s etc., and that's based primarily around the need to shoot the tracer rounds, which are REALLY long. The standard M855/SS109 round will do pretty well out of a 1x9", and I suspect would also probably work out of a 1x10". Haven't tried them in one, but I'm pretty sure they'd stablize.

As far as the lighter bullets go, no problem at all. I've seen the term "overstabilized" get tossed around a bit here, but technically, there's no such thing. Spinning a bullet faster than is needed to achieve stability will accentuate any problems with jacket concentricity and MAY open groups. Assuming you're using good quality bullets with decently concentric jackets, they should shoot just fine out of a faster twist. Done so in many tests, but that was using good qulity stuff to begin with, so there wasn't much to magnify in terms of error.
I stand corrected. I do recall being instructed that they are 1/7 twist. I could a swore I've seen the stamp say 1/7.5, I actually went and checked my A4, and two M4s, sure 'nuff 1/7.

Sorry for leading everyone on.
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  #12  
Old 04-13-2011, 11:30 PM
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Re: AR15 1:10 best reload

Thanks Kevin, it's just for punching paper at long range. I usually shoot bolt guns, but I am putting together a long range semi auto, just to see how it compares in a tactical match. All for fun! I just don't have alot of experience with loading .223. I've shot an M-4 alot, but not as a target rifle.
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  #13  
Old 04-14-2011, 08:54 AM
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Re: AR15 1:10 best reload

If you've got the twist to stabilize them, go with the heaviest bullet you can get away with, and that should be you're best choice for LR shooting. Slightly lower velocities, sure, but remember; Velocity quickly fades, but BC is forever. (thanks to German Salazar fro that one.)
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  #14  
Old 04-14-2011, 10:03 AM
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Re: AR15 1:10 best reload

thanks, I'll remember that quote!
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