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Resurrecting an old post to keep the information all on the one thread.
The 9.8 of SR4759 in a 16 inch barrel seems to do the trick. The old barrel was too long at 22 inches and cutting it back appears to have taken the variation out of the velocities for the 240s.
Happier again. Happier too that I am now using the RCBS Chargemaster to produce more consistent loads.
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