56.7 is on the top end, no question. I'd switch to Fed215/215M or CCI250 if you're going to run that heavy a charge. Some primers can't take that kind of pressure.
In all of my testing with 140's, I hit heavy bolt lift right at 57gr of H4831SC at a velocity around 3050fps. So you're pushing it. I'd back that off for certain.
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In all of my testing with 140's, I hit heavy bolt lift right at 57gr of H4831SC at a velocity around 3050fps. So you're pushing it. I'd back that off for certain.
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