Tried two new loads today in my Marlin 1895 XLR .45-70 24" barrel. First was BTB 325 gr FNGC over 53gr of IMR 3031. Grouped great at 50 yards with speeds of 1870 to 1886 fps. Second was the BTB 525gr Pile Driver over what I thought to be a conservative 47 gr of IMR 3031. Marshall shows a max of 52 gr of IMR 3031. With this load we got 1786 to 1797 fps. You knew you touch off something big when you pulled the trigger. The cases swelled slightly about 1/8" up from the rim and took some effort to lever out of the chamber. What do you think? Too much pressure? I was not expecting those numbers with 47 grains. I used Remington brass and Federal 210 primers.