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Old September 17, 2011, 10:43 AM   #4
Jim Watson
Senior Member
 
Join Date: October 25, 2001
Location: Alabama
Posts: 10,984
You could apply the old rule of thumb that for small changes, a change in powder charge will give twice as much change in pressure; 5% more powder = 10% more pressure.

You could use the Lee Reduced Load formula. Sorry, I no longer have the book, maybe somebody will post it.

You could ask somebody to run it through Quickload.
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