I'm about ready for a new project. I have a Rem.700 varmint spec., a older "80's" one, in .243. I want to re-barrel to 6.5Crmr. I have been reading about the Muller barrels and want a opinion on them. Most of my shooting bud's are running Bartlain's. We mostly shoot from the bench at 300 yrds. and ocasionaly to 1000 yrds. Also, is there a difference worth noting between 8 and 8.5 twist?