cmdc
Member
I have a number of ARs and other 5.56 caliber rifles, and most of them are 1:8 or 1:9 twist. I also have two 16" carbines with 1:7 twist(Colt 6920 and KAC SR 15). I am wondering how much loss of effective range there is in these rifles with heavier bullets compared to a 20" barrel. Thanks