ZRE..your correct !! The fastest the twist the heavier the bullet in any and all calibers and cartridges !! Any gunsmith who reccomended or told anyone the opposite should stay away from your rifles..he doesn't have the oars in the water....As the range master for the Mifflin Co Long Range Groundhog match I get to see just about everything ever made sitting at the line, from right off the shelf to some of the best long range shooters on the planet... the 6mm/.243 is by far the most popular without question but in the 6BR remington and the 6PPC and why more non-competition shooters don't used them has always puzzled me, they are simple to reload for and some variations of both are factory available these days..their accuaracy is amazing compared to both listed above..they are just as fast and both will shoot 1 inch or better groups at 500 yards, even the common guy with a good one will shoot 2 inches or better at 500 yards... you guys need to look at both of these cartridges, they are amazing!! PLUS, there's a ton of other wildcats that are just as amazing..