my thinking you find what is comfortable for the shooter and what is accurate for the gun.
I am an be leaver in less is more. when I was shooting powerbelts. I top off my set up at 85grs of 2f powders. that is where the load was most accurate and the recoil was not that bad.
after working with conical full time, I came to realize. powerbelts are nothing but an updated pure lead minnie ball and should be treat as such. on the new powerbelt packaging it states an ideal charge, follow that.
an idea for an true upgrade for powerbelt, used an little hard lead alloy could solve the problem.