40 70 PP problem

[ken s]

Ken.

Give us a little more information.
What is the brass your using?
Case neck wall thickness?
Chamber diameter at the neck. If you don't have this, what is the diameter of a fired unseized case mouth.
I have never seen Onion skin paper .005" thick.
A double wrap of your .005" thick paper would add .020" to your unpatched bullet.
Your .330" unpatched bullet would be patched .350" and that should fall right through your .403" bore diameter.
The .390" with .020" would be .410" diameter.

sorry Kurt. the diameter of the bullet is .397 and weight is 330 grains.
the paper mikes out at .005, so I'm getting a large .417 result.
It does chamber. and once in the shell it works.
just loading is tough.
The brass is once fired 40 70 SS from Buffalo arms.
thanks...Ken