If ya can dent it easily with the thumb nail it`s probably soft enuff ,5-8 bhn I consider pure .
The problem is`nt shooting em the problem is loading em , especially in a C&B revolver , ya need em soft/big enuff to cut a ring off without breaking the lever !!
The Smoke Poles will work if ya can get em beat down the barrel the Holy Black will push em back out, don`t ask
I cast a few for BP out of stik-on wheel weights & have little problems.