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Old December 21, 2009, 07:04 AM   #3
Senior Member
Join Date: September 3, 2009
Location: Charleston, SC
Posts: 169
+1, The biggest differences are using different brand bullets with the same weight. The shape, and therefore the bearing surface (the amount of the bullet that actually touches the barrel) is one of the biggest causes of the differences in max charges.

I usually use three load manuals and take an average of the max charges as mine.

I wrote an article on how I do load development on my website, it might help you out.
Owner of & Chief Instructor for The Southern Marksman, LLC
NRA Life Member, NRA CRSO, Multi-Discipline NRA Certified Instructor
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