First thing I do is shoot a box of shells as fast as possible and plunge the barrel into an ice chest of dry ice.

I clean it and do it again.

My first 2 cleanings are with a tornado brush and a drill

I clean it then start dialing it in. I then plunge it to cool it off between shots.

Any rifle that doesn’t group one hole at 25 and touching at 100 for me gets sold.

I always chrono, do the ballistic chart and dial it in at 25 yards for whatever MPBR I choose, then I check it at 100 and 200. If its a snap sight-in without a chrono and calc I dead zero at 25 yards with average hunting calibers and its usually good nuff to 250 yards