Questions on M3 37mm rifling

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Andy Cole
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Questions on M3 37mm rifling

Post by Andy Cole » Fri Apr 23, 2021 5:07 am

Does anyone know the rate of twist of the rifling in an M3 37mm barrel?
I've got a fired projectile, so I can count the number of lands and grooves as pressed into the driving band.

It has 12 lands and grooves pressed into the brass.

The grooves measure 5/16" and the lands 3/32"
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dpcd67
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Re: Questions on M3 37mm rifling

Post by dpcd67 » Wed May 12, 2021 7:39 am

I think it is one turn in 36 inches; a friend has a real one.
Books say 25 calibers; which is 37x25.
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