There is so much more to all of this than just the rifling and rate of twist, you have brass prep, oal of cartridge some barrels like a jump of up to 40 thousands, some like to be kissing the lands, a semi auto rifle is not the best choice to shoot 1 hole groups but some will do it , my point is that there is a whole plethora of things that make up a accurate rifle including the shooter, and even more so the trigger... all have a impact on accuracy... I learned experimenting with a Ruger Number 1 action 1 shell at a time trying all different lenghts and oal's powders ,primers, case's. it is a lifelong quest with no one certain answer.... but it is a lot pof fun so enjoy.