I shoot a Saeco cast SWC that is 220gr nominal and comes out at 223gr as I cast them(I cast softer than most people).These are bevel base.I put them on top of 19.8gr H110.Carefull;I worked up to this load,starting at 18.5.No pressure sign and no leading.They come out chronoed at over 1300fps from my 5 1/2''bbl Redhawk(I know,it ain't a model 57 but I'm working on it!).
BTW,one of my friends has a 657 in 8 3/8'' and shoots 220gr jacketed and uses the same load.The load is plenty accurate in both forms.
Qc