I load 3.8 grs of hp 38 under a pb 115 gr bullet for my circa '31 OP. I believe it would be ok in an oldie D frame. This load is very accurate in my post 2000 94 cl. I use the same load under a 90 gr hb wadcutter. I have also shot a gc 115gr using my rifle load of 1680 in the OP. I'm told the load produces 25,000 cup. All these loads produce excellent accuracy in both shooters. The first time I fired the Marlin at 100yds with the 1680 load it gave me 2.25" ten shot group with 7 going into 1.25". I love my 32/20s.