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I did my first one at about 1.75" and used old t-shirts for wadding.
FIgured 80 grains of FFG.
We popped a few.
And we popped a few more.
And I stuffed in 80 grains (by capacity) of Bullseye, figuring that if Bubba got 'hold of it, that could happen.
It bulged it a couple of thou.
Made out of Chicom 1018, 2.75" diameter solid bar, drilled and bored. 1/2" walls. Fuse size is a #30 twist drill.
Did the first one with about a 45 degree angle, 6" barrel. Going to switch to about 60 degrees (toward vertical) and a 3" OAL. Given that an inch of the back is 1/2" of solid, and a 1/2" powder cavity, the patched ball will be visible, much like the original coehorn mortars.
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