Just joined, my first post. Have been reloading for HG and SG for about 2 or 3 years. Just starting to appreciate precision loading for varmints and accuracy in the last year. I have a simple question: In a nutshell, (unless someone wants to elaborate) what does the 6mmBR and all its multiple variations do that so eclipses what my good old .243 Winchester does? More specifically, my .243 Win that I load for doggin', targets, etc. I know the cases are structured differently, etc., but what's so great about it that I should ponder getting a gun in this caliber? Thanks in advance, this seems like a great site with a great forum.