Hello John...
I don't shoot Black.. Just PP smokeless...
I have a good friend that shoots PP Black in a Shiloh 45-70 with a .458 groove and a .450 bore...this is his formula ..
1. His wants his patched bullet to be .450 or bore dia.
2. Right now he is casting a LEE 500gr RN out of pure lead...
3. Then he runs the bullet thru a .457 or .458 Lee push thru sizer die..
4. Then thru a .451 Lee push thru
5. Then thru a custom .443 sizer die... Buckshot at
www.castboolits.gunloads.com makes them cheaper and faster than Lee makes custom dies..
6. He then wraps the bullets 2 wraps with Buffalo Arms 100% cotton patch paper...he likes it the best
7. That brings the patched dia. up to .450
8. He loads it over a compressed load of black with a grease cookie under the bullet..
We took our PP loads out and shot them last Sunday on a old logging road and had a great time ... I was impressed how well his ole stinky loads shot...
Hope this info helps you on your way shooting PP...I am sure he would send you some bullets but as we live in Canada there would be problems shipping across the border...
Have fun John!