I have a hart 22" bull barrel that shoots great when cold/cool. However after about 7 rnds it really heats up and accuracy seriously drops off. .4" groups @ 200yrds (cold) 1.5" groups @ 200yrds (hot) .308 Win BTW My question is would fluting my barrel really make a difference? If I send it off, its going to take a minimum of 12 weeks. Not to mention it will cost me a bit. What do you guys think?