I load a Lyman 457406 GCHP over 42 grs. of 3031 sized .459 in my Marlin 1895 with micro-groove rifling. Very accurate and powerful. The bullet as loaded weighs 440 grs. and ends up with a flat point as I use a flat nose punch when sizing and lubricating. The guide who skinned my 200 lb. black bear in New Brunswick had told me to always hit them at least twice and I did as I was told. He said the insides looked like a train wreck lengthwise through the body and the second shot wasn't necessary! My favorite hunting load but recoil is definitely noticeable. I wouldn't trade it for the world! The stated weight for the 457406 without the HP is 485 grs. so the HP hole is substantial. I sure would have liked to find one of them!