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Old June 23, 2011, 11:07 AM   #16
Senior Member
Join Date: June 12, 2010
Posts: 475
Inadequate bullet-to-barrel fit can result in decreased accuracy. Have you slugged your barrel to determine the groove diameter?

Typically, for a .451" barrel, .452" bullet will provide a good fit.

If your barrel is oversized (.452"+), you may need to use bullets sized larger to improve your accuracy and decrease your leading.

For my .451" M&P45, even lighter target loads with .452" bullets produce accurate shot groups and no leading.
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