Charlie, if I remember right, I was getting about the very same performance out of my 5 1/2 ROAs with a 30gr load. I don't have conversions for mine. I played around with a bunch of different loads and settled on 30gr for CAS shooting. I shoot APP powder pretty much exclusively these days.
I had a crono and was using it to dial in rifle loads and the crony took a hit in the forward window and is now history. (Don't ask) I seem to have my set ups now on all I shoot for CAS in rifle, C&B, cartridge and shotgun. It takes some playing with and testing. That is where getting into reloading helps a lot. You are not at the mercy of a standard load and can load cartridges to suit yourself with a combo of bullet weights and powders. It is a lot of fun.