What powder/bullet combo’s are working best for the 6.5 x 47 in the guns chambered by Britt’s reamer. Anybody running Varget behind 140 hybrids? I have been using H4350 but to get the velocity I want from the 140’s the case is too full. RL-15 and varget both are working good for me but was wondering if anyone was using other powders? I have read that R-17 is great in this round.
Steve, when Varget was hard to get, I experimented with IMR4320, 4064, H4895 and the then new IMR4166. I don’t know if it would get get you to where you want to be velocity wise; but I have found that I can get much more H4350 in a case with long tube funnels and a “slow” pour. I think that mine are 10″ and 12″.
FWIW, the 4166 has the magic dust that allegedly makes it less temp sensitive, and has given good accuracy in the loads that I have tried it in.
Thanks Al. I’m trying to find a tune that will group well with and without the suppressor on. I know there will be an impact shift with the suppressor but I’m hoping to find a load that will group good with both. I may be expecting too much!
I suspect that you can find that load at a lower node rather than a higher one. I really don’t know the mechanics behind it; except that it has been my experience. It should be noted that my work with suppressors is very dated and that current designs may not follow the same parameters.