Dave -- You ARE allowed to post over there BTW [img]/ubbthreads/images/graemlins/wink.gif[/img]
the link is actually http://www.6mmbr.com
First Tip...scrap the rem chamber and punch it out to a 6BR Norma...then use lapua 6BR brass.
.260" loaded round is plenty tight IMO...i like 0.003 total clearance in 1KBR
powder for the 68s = n135, benchmark
107's = varget, RL15, h4895/IMR4895, h4350 will make a nice compressed load too.
THe 6BR Rem chambers are shorter...so dont go by 6BR norma trim-to length.