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Old June 17, 2010, 11:32 PM   #5
Senior Member
Join Date: February 24, 2009
Posts: 727
Size once, then no more sizing is usually needed with BP. The powder keeps the bullet from seating deeper, and the crimp keeps it from backing out. BP develops such low pressure, that cases don't tend to gain enough permanent expansion to require resizing when reused amongst guns properly chambered to SAAMI specs. In fact, the early Ideal tong loaders had no provision at all for case sizing as they were designed to be used with BP.
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