40 mm quston

[flyingmonkey35]

I slugged my friends 40 today and we found that the grooves measure at .391.


This explains the leading we get when using cast.

I am having him call the gun manufacture as that's a bit nuts.

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[kmrra]

Yep thats .01 a little too small huh , That just dont sound right to be that small

[flyingmonkey35]

40 s&w. Sorry

. Shouldn't the barrel be .400

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[kmrra]

Yes , the cast bullets that I cast , they are at .401 , so something is not right

[nicholst55]

I was about to comment that .391" ID is a might small for a 40mm... :groner:

[NavyVet1959]

I was about to comment that .391" ID is a might small for a 40mm... :groner:

Yep, that would be a pretty extreme bottleneck case. :)

[wmitty]

We need to set up a category for Oerlikon and Bofors!