Does anyone reload the 400 grain wide flat nose copper bullets from Lehigh? If so, do you think the copper bullets being longer than 400 gr. Lead bullets presents a significant rise in pressure?
If you seat it deeper it will make a tremendous difference in pressure. Small changes to seating depth affect case volume substantially, causing rapid variance to pressure.
Case volume is just one of several factors that is different with solid copper versus lead-core bullets. Resistance to the bore/rifling is often dramatically different and further raises pressures. You cannot simply use lead data.
I was just comparing these Lehigh bullets to some 400 gr. Jacketed bullets I have lying around. If I seat the bullets on the lower of the two crimp grooves, the copper bullet will actually leave a little more case capacity than the jacketed bullet so I don't think pressure will be an issue.
As far as increased bearing surface, the copper bullets have two driving bands which seem to have less bearing surface than the comparable jacketed bullets.
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