beer can coehorn plans

Polar Man

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My one inch bore turned out rather well, lots of fun to shoot, (don't worry I'll post the pics soon) but my next plan is a beer can coehorn mortar.
I need some decent diagrams or at least dimensions for things like wall thickness and the powder chamber size.
We just got a nice new manual lathe and a 2'' insert drill at work so it should be an easy enough job to bore it out.
 
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