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Just a little update since I mentioned using Trail Boss powder. Got to try some rounds in what the owner said was a match barrel and the bolt starts dragging with the 200 grainers at 960 fps so I see no way to use this with bullets over 200 grains if you are trying for the usual 1000 fps mark. This was at 9 grains of powder. The 125 gr FBHP fly very nicely at 1020 fps with 6 grains which is 1.3cc. I believe the powder burns a bit faster than what I was thinking.
just in case I'm talking about the 7.62x39 cartridge
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