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Old December 27, 2012, 01:43 PM   #3
10 Spot Terminator
Senior Member
 
Join Date: January 3, 2008
Location: Central Oregon
Posts: 346
All of your top reloading manuals list pressures for starting loads as well as the recommended max loads for a given bullet weight and a specific powder in the calibre you shoot. There are 2 forms of measurement used in the industry , one is PSI and the other CUP depending on the test equipment used during the load testing by the provider of the manuals. There is no formula that I am aware of the convert CUP to PSI at this time but as with PSI if the listings are IN the CUP format, staying with the lower numbers will keep you and your firearm safe.
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