There are several powders that work well, but some are better than others. I started with a 6BR quite a few years ago, and was told " 30 grains of Varget with a 105 hybrid and BR4 primers seated 10-15 off". Varget is not the barrel burner some think it is. I just retired a 6BRA barrel that had 3100+ rounds on it, and would still shoot cleans at 600 with less than 2" vertical. That only had Varget used. R15 works great as long as you watch temps and humidity when it gets up into the 90+ range. In most cases you need to back off a half grain to stay in a node for velocity anyhow.Thanks for the info.
The vibe I'm getting is that 6BR / 6BRA are not fussy to load for and a wide range of powders will work.
VV 140 and 540 are great as well.
Are you watching any of the World Jrs.? We may have to start talking some shit here in a day or two...