Lancaster-

Thanks.
That all makes perfect sense.

On stop ring diameter off the catshead bullet drawings and specifications from the page you have shown above:

Stopring diameter is the same for paper or metal case.
Bore/groove for metal case will be different than bore/groove for paper case, right?
That makes the paper case bullet 'more of a squeeze' into the bore and grooves then doesn't it?

My level of comfort says "Tinker, run pure balls of a diameter slightly over groove diameter"
The above noted information suggests "With your paper case guns, run conical bullets of fairly larger diameter than groove diameter"

What is your perspective on this, Lancaster?

Taking 16b for instance
-with metal case the difference between bullet (we'll assume groove) diameter and stopring is only .005"
-with paper case the difference between bullet (we'll assume groove) diameter and stopring is .041" (1mm)!!

Do you think that hunters were firing conicals down their barrels that were .041" (1mm) larger in diameter at the stopring than the groove diameter of their barrels?

Have you ever done this?

Thanks for entertaining my curiosity.

--Tinker