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Old June 9, 2012, 11:58 PM   #25
zxcvbob
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Join Date: December 20, 2007
Location: S.E. Minnesota
Posts: 4,116
Cast bullets have different load data than jacketed bullets.

In some short high-pressure cartridges -- 9mm, 40S&W, etc -- the bullet shape makes a difference. (it really has more to do with the seating depth) In revolver cartridges, it really doesn't matter much until you get to the very top end with .357 Magnum maximum loads. The exception is wadcutter bullets, because they are seated deep in the case.

The example you gave, 158 grain lead SWC vs 158 grain lead RNFP, yes they are pretty much the same
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