One thing to make sure of before getting reloading gear or components, is to get a good chamber cast, and slug the barrel. My Roller was described as ".43 Spanish" (11.15x58R), but turned out to be the ".43 Spanish Reformado" AKA 11.5x57Rmm. The .43 Spanish normally takes a .439" bullet, but the Reformado takes the .446" bullet and the case is more tapered than bottlenecked. The previous owner of my gun evidently shot the bottlenecked round in it, and the chamber is eroded near the throat. Both rounds are formed from the .348 Win case. .43 Spanish reloading dies are fairly inexpensive ($40-$60), available from Lee and RCBS, but the Reformado dies are only available by special order from 4-D, through Buffalo Arms and run over $110.00. I have found that Buffalo Arms has good materials for both rounds, and their staff is pretty knowledgeable about the quirks of the .43 rounds. My rifle is not a "great" shooter, but loading it up with a full case of black, a felt wad, and a 385-gr bullet will keep me hitting a 8" steel plate a 100 yds, and a 12" plate at 200. I have no idea of how it groups, as I have never shot on paper. I does pack a whallop. I took a 150-yard shot at a steel buffalo sillouette about 24"x16" in size (about 30 lbs), and knocked it completely off its stand. Other shooters with .45-70's just rocked it. Maybe I just hit it in the right spot, but it was impressive, and I got a lot of slaps on the back.