Best bullet weight for 1in9 twist 11-5" AR barrel

[Undergiver]

Like the title what is the most accurate round for a 11-5 AR barrel ?

 

[manitou210]

69gr sierra's should work great. try varget & reloader 15

 

[Airborn_69]

69gr sierra's should work great. try varget & reloader 15

69gr BTHP Fed Gold medal match if stock. for a 11.5'' barrel which I am foreign to, I would say some 62gr SS109 would do great also.

 

[Glock4ever]

I like the 60 grain VMAX bullets - they look badass and are ballistically similar to the 62 gr stuff for your ACOG.

 

[MirageSwirl]

Winchester white box 46grain HP was extremely accurate in my 10.5" 1-9 Rock River Arms.

 

[Paulinski]

1/9 twist rate up to 69 grain should be fine.

 

[Chris Dingell]

Maybe I just have a difficult barrel, but through a 20 inch 1:9 barrel, the only bullets I've been able to get to group are 52gr. Two hundred yard groups with 69 and 75gr bullets are only so-so. With 52gr SMK's it shoots little knots.

CDD

 

[jollyroger]

every time i read a post on bullet weight vs rifle twist it makes me puzzle over why the CF uses a 1-7" twist and fires a 62 grn slug... isnt that a bit tight of a twist???

 

[woodchopper]

yes tighter twist needed to stablize the longer heavier bullets

also remember tracer rounds are a lot longer then a normal round, so if you what to shoot them too you need a tighter twist

 

[juliet lima]

Ahahahahahahahahaha.

You are looking at playing the accuracy game with an 11.5 bbl. A barrel that won't even get the round above 2500 fps from a gun that has a 2 moa benchmark.

Seriously, hahahahahahahaha.

jl

 

[KevinB]

It more depends on the chamber and throat than the twist, that said 1:9's don't really work with long bullets.

If you are looking for an accurate paper loading the 69gr SMK stuff is good -- your best of handloading as most of the .223 ammo was designed around a bolt gun and is not crimped well for use in a semi-auto.

1:7 is the best twist for most bullets in 5.56mm, 1:8 is also a good twist.

-Kev