I have been working up loads for my Marlin "cowboy" in .45-70. I have noticed that there is somewhat of a shortage of available load data for heavy WFN cast lead bullets, so I decided to share what I am doing with Doc Holiday's 425 grain "Tombstone's". I shot a five shot group this morning with 41 grains of IMR-3031 behind a 425 grain WFN hard cast. Next time out, I will likely try 42 grains of IMR-3031 because I want to shoot these bullets at around 1400 fps.