I purchased a 6mm BRA Stuteville prefit barrel in early October and thought I would share my results after 3 different powders.
CCI450 Mag primers, New Alpha 6BRA brass, Barnes 105 bullets, all shots .020” jump
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Never could get enough powder in the case to make velocity with H4350. Lots of powder crunch after 31.5 grains. I would only run this powder if it was all I had.
Varget was disappointing to me from a velocity standpoint. I stopped at 30.6 grains and 2851fps with heavy bolt lift and slightly difficult extraction. I was surprised by the abruptness of which pressure signs showed up. Perhaps I should try smaller powder interments. I suspect I can run this powder at 29.9 – 30.2 grains running 2800fps and will likely develop a load there.
I settled on VV N540 at 30.8 grains which gets me 2915 fps with ES 14 and SD 4.5. Put 5 shots in a 4” group at 883 yards. I love this load and imagine it will be hard to beat with any other powder but I'm open to suggestions.
Given that Varget made pressure at a lower velocity than N540 and Varget is faster burning than N540, Should I expect H4850 will burn too fast to make better than 2900fps?