Looking to try and use some Lehigh Defense Controlled Fracturing Bullets 458 Caliber 570 Grain Solid Brass in a long range 45-70 load development. Stated BC is .883 and the OAL of the projectile is 1.955 inches. looks like it could be promising. The rifle is an H&R buffalo classic, not the strongest action but it can take some +P loads. Anyone here have any experience with loading 500 plus grain projectiles in the 45-70? hard to find any data in reloading manuals for this type of thing. I would like to use smokeless powders for the load.