4831 is too slow a powder for the 4570. He is using the bulleye to get it to burn better. Bad Idea. As mentioned above pull the bullets and discard the powder. Start over. Your Browning will handle all 45-70 loads well as it is in the class with the Ruger number one for strength. As far as that load, the 405 grain bullet loaded with the right powder will take all North American game with ease, within its practical range. I load the 350 Grain Hornady with IMR 3031 to 1950 fps anything in its way is toast, or I should say roast.