I have been using winchester supertarget with a 230 rainier. The load is quite mild. Federal primer, winchester case, 3.6 grains of wst makes 167 out of a five inch 625. I shoot the same load for icore & uspsa. I am sure you can work backwards and have a really nice 120 pf load. One of the other guys I work with has. Very clean and consistant even with light charges. Tightgroup is not clean at the pressures you are talking about. It leaves a bunch of unburnt powder in the cyclinder( looks like a rabbit took a crap in it).
Jason
I have been using winchester supertarget with a 230 rainier. The load is quite mild. Federal primer, winchester case, 3.6 grains of wst makes 167 out of a five inch 625. I shoot the same load for icore & uspsa. I am sure you can work backwards and have a really nice 120 pf load. One of the other guys I work with has. Very clean and consistant even with light charges. Tightgroup is not clean at the pressures you are talking about. It leaves a bunch of unburnt powder in the cyclinder( looks like a rabbit took a crap in it).
Jason