Some of the powders I have are: Accurate and IMR4064, Accurate 2015, and Accurate 2230 powders. I should have some 4895, I will have to look. The plated bullets are relegated to lower velocities, these are spec'ed for the 45/70 and have a knurled crimp groove. What I have been finding is loads for the 450 Marlin and 45/70 using this bullet, and even a lot of these loads exceed 1,950fps. Will these "light" loads be a problem in the larger 458 case? IE hang-fires, or erratic velocities? Would there be a need to use fillers with these lighter loads to get consistent ignition and velocities? I would like to keep the velocity around 1,800 fps to prevent the plating from coming off.
