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Old May 8, 2012, 01:49 PM   #2
sc928porsche
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Join Date: May 29, 2008
Location: now living in alabama
Posts: 2,433
The best way is to actually "slug" the bore. Once you know that diameter, then you will know the proper size for that firearm.

As a rule, for safe loading, Jacketed 44's are .429 and lead is 430. Lead is usually .001 over the diameter to insure a good seal.
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