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Old March 12, 2013, 11:29 PM   #1
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Join Date: February 25, 2013
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Bullet size question

im looking on Pacnors custom barrel page and they offer a barrel i want in 20mm, however, it has (.825) next to it. 20mm is .79 something. is there any barrel maker out there who makes a true 20mm? i need something around the .79 area .

still confused why pacnor says 20mm, but states .825
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Old March 13, 2013, 07:36 AM   #2
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PacNor lists the groove to groove dimension. Call them directly to see what the land to land dimension is.

Some quick math in my head says that .825 minus .790 is .035, which would give a rifling depth of .0175". But you'll need a barrel with the groove to groove diameter matched to the projectile you want to use.

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