I had the Lyman mold--in fact I may still have it. I don't have the 25-20 any more (Marlin Classic). Up until a couple of years ago I still had about half-a-coffee-can full of those little Lyman 257420 bullets all cast up. There's lots of those little fellers in half-a-can. With my wheelweight mix they cast out at around 69 grains. My brother had acquired a pristine model 92 in that caliber, so I sized them up and gaschecked them. Then he went on Gunbroker and saw what pristine early-1920's saddlering carbines were selling for, and immediately locked his little rifle up. When I had my 25-20, I shot those little bullets a lot--every bit as accurate as a jacketed Remington 86 grainer. Send me a PM. Brother Art has a bunch of those little cast bullets still, and would probably be willing to part with some. He's got an abundance of them. I don't know anything about the RCBS cowboy bullet--it's listed as an 85 grainer. It should be a good one as well. That's a caliber just made for fun with cast bullets.