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Discussion Starter · #1 ·
I just bought a AR-15, Stag arms Lefty with a 1 in 9 twist. I want to shoot 75 grain ammo in it. Is this the correct twist rate for that load? If not what is the correct grain weight to go with. I intend to use it for general target shooting and defeating the zombies :)
I also plan to take Gun Site's carbine course with it.
Thanks all
 
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Discussion Starter · #2 ·
I just bought a AR-15, Stag arms Lefty with a 1 in 9 twist. I want to shoot 75 grain ammo in it. Is this the correct twist rate for that load? If not what is the correct grain weight to go with. I intend to use it for general target shooting and defeating the zombies :)
I also plan to take Gun Site's carbine course with it.
Thanks all
Well as a rule, no.

1/9 twist is more suited to weights of "around" 50gr to 69gr.

That being said, some folks report good accuracy from heavy bullets in a 1/9 barrel. Some don't. You may have to try some.

You may have a tough time finding ANY loaded ammo over 70gr or so as the the military has caused most of it to vanish from the shelves at least in my neck of the woods.

For a carbine class, I'd try regular commercial 55gr .223. No sense going broke trying to find enough 5.56mm.

For most folks 1/9 works just fine.

ZM
 
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Discussion Starter · #3 ·
According to Patrick Sweeney, 75-grain bullets require a 1/7 twist and are not stable in slower twists.

I shoot a lot of 55 grain FMJ for target practice in my Stag 2L and have been quite happy with its performance.
 
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