7.62x38R, aka Nagant Revolver...

[saands]

Fair enough ... I also left out the detail of the area of importance being the cross-sectional area of the inside of the case out of simplicity ... it already seemed TOO detailed, but you are 100% correct

Saands

 

[unspellable]

Brevity

Now you have learned the dangers of brevity.

 

[GuidoTorpedo]

http://www.ifrance.com/chasse-tir/les Cotes des douilles.htm

 

[mfree]

Nice site, although there's no Nagant listing