I can chime in on this one...... I shoot .223 exclusively in F Class T/R out to 1000 yards. I run a 90 grain bullet at 2995 fps and have been doing it for several years on the same barrel. I'm over the 2K down the tube. It really shines at 300-600 Mid Range. In order to "stir the pot" with the Open Class folks, I decided to built a .22-250 AI with a 30 in 1-7 twist barrel.... running 90 grain Bergers, just like my .223. Oh yeah, I don't need a stinking mechanical front rest..... going to do it off a Bipod! Will it be hard on the barrel???? YEP!!!!!! BUT WHAT A RIDE!!!!!!!!!