So, the barrels slug anywhere from .353" up to .358".

I will look into getting some pure copper and lead 245 grain bullets made aaat .358" and others made at .356". Then I cna get some swaging dies for the old Corbin to adjust diameter for any of the various bore sizes. The brass and the powder charge should be the same, except having to open the brass mouth more or less to fit the various bullets in.

Hawk bullets in the US might be able to help. There wa a nice fellow in Bavaria, where my family originates. He had all the sizes, but like us all eventually he died a while back.

The 245 grain bullets are the good killers for hunting medium game, and hitting to line of the sights.