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Old December 22, 2019, 08:36 PM   #15
Bart B.
Senior Member
Join Date: February 15, 2009
Posts: 7,402
Nick, the powder heat index plays a role too. Hotter burning powders cause faster wear rates than cooler ones. A guy on Accurate Shooter forum modified my formula to make a correction:

The above link mentions some benchrest barrels are considered worn out when they no longer shoot groups in the ones; under 2/10ths inch/MOA at 100 yards. Yet several-group aggregate records include some groups larger than 2/10ths inch. His standard could mean no groups in the ones are no longer shot regardless of the largest one's size.

Here's a different approach:

Last edited by Bart B.; December 23, 2019 at 09:51 AM.
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