I am fairly new to rifles, I could tell you a lot about shotguns but rifles I am clueless about. But anyway I am building a AR-15 for Coyote hunting. It has a 1-9 twist rate. I hear that different grain bullets wont shot very accuratly because of the twist rate. Can anyone explain this to me? For example Barnes Bullets reccomends that you use a 1-10 or faster twist rate for their 50gr Varmint bullet but they dont say anything for their 36 gr bullet.