what bullet weight for a colt 9mm smg?

[contact148]

Ok guys ive got a colt ar15 9mm smg

its a 10.25 inch barrel with a 1 in 10 wist so what would be the BEST weight?

 

[t-star]

try a bunch of em and see what groups best- i've found the uzi likes 115 fmj - but it's open bolt-

 

[Anonymous]

I haven't reloaded for mine yet, but I was planning to try some of the heavier bullets first, like the 124gr RN..... I just figure with the longer barrel (as apposed to a pistol barrel) the heavier ones will work a little better... and there is really no recoil to worry about. :mrgreen: But I guess only time, and some reloading will tell.