In browsing the Forum I have noticed a number of posts asking how to crimp these cases. When I started reloading my .310 I was concerned that the bullets could move in transit and I was also convinced that crimping of these little light rounds would help to ensure that the small powder charge would build up a consistent pressure. That along with having the OAL such that the bullet was pressed aginst the rifling for the same reason. But how to crimp the case? A good friend with a lifetime of reloading experience had the answer. A .303 or 7.5mm crimping die. But with the cartridge put bullet-down into the top. With a simple bush made up with a shallow shoulder on the bottom to centre it in the top of the die. A hole drilled down the middle for the case. And the length of the bush adjusted so the case protrudes just enough to put the mouth of the case into the crimping section of...
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