Re: .243 vs .260 vs 6.5x47 Lapua
243, 243AI, 6mm, 6mmAI, 6mm Crusader - all great rounds, lots of fun, and really flat. I don't get attached to barrels, they wear out. I migrated more to F-class than tactical so finding a caliber at knee of the curve, get me a whole season w/o going to Nationals with wore out barrel or new, unproven barrel is my goal.
Depends on use and goals but in a competition setting, very unlikely you are going to be competitive (in F-class anyways) with a hot 6mm at anything over 1500 rounds and 1100 is closer to truth.
Want a hot 6mm? Get one and have fun with it. Just don't be suprised when the barrel gives it up a long ways before you get to 3K rds down the tube.