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Old January 3, 2013, 10:02 PM   #10
Senior Member
Join Date: May 25, 1999
Location: Too close to Houston
Posts: 4,143
The powder hasn't changed much but the way they test chamber pressure has.

I keep old manuals for reference and use the starting load data to start with load combinations or cartridges that aren't in new manuals.

For safe pressure limits I trust new manuals with old powder much more than the other way around.
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