I shoot the 200gr Ranier SWCs so my loads may come close for the RN models.
My best loads are:
9.6gr AA#5
4.7gr WST
5.3gr Win 231
I've also tried various loads with Red Dot, Universal Clays, & IMR 700-X, but these top 3 are the best I've gotten up til now. And the AA#5 load is a real tack driver out of my Springfield 1911-A1 Mil-Spec................it'll cut 1/2" groups at 15yds all day long for me. BTW, the OAL on those loads is 1.258".
Based on what I've seen in all my different pistols, the RN bullets may require a tad less powder than a SWC for best accuracy.