I've recently built a 300/221 Fireball and am extremely pleased with it, however I started reading the 308 Subsonic thread on this forum and started playing with that as well. I've had really good luck with consistency using Hodgdon's Titegroup in 308, and it's intended for case capacities much smaller. It seems to be very consistent and very immune to positional issues (even at less that 1/4 case capacity in 308). I'm still working out bullet stabilization issues in this particular load but that's more of a bullet/twist issue. You guys might give it a try in these 7.62 x 39 loads, I think you might be pleased.
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