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Old July 16, 2021, 04:54 PM   #2
Senior Member
Join Date: September 19, 2008
Posts: 969
Quite often you'll find that metal content affects size as dropped after cooling.

This link has one shrinkage chart as an example and includes .357.

You want to check the makers recommendations or actual mould size.
Some moulds and alloys may not need any sizing, others yes depending which actual diameter you want.

May want to jump over to if you haven't been there yet. You may get answers regarding specific moulds and alloys.
All data is flawed, some just less so.
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