I went and compared my loading data to the 458 Win Mag with IMR4198 and found out it's practically identical.
DO NOT USE SMOKELESS POWDER IN ANY MUZZLE LOADER UNLESS THE MANUFACTURER DESIGNATES IT AND STICK TO THE LOADS IN THE MANUAL OR TRUSTED SOURCES OR YOU HAVE A PIPE BOMB BLOWING UP IN YOUR FACE !
DO NOT USE SMOKELESS POWDER IN ANY MUZZLE LOADER UNLESS THE MANUFACTURER DESIGNATES IT AND STICK TO THE LOADS IN THE MANUAL OR TRUSTED SOURCES OR YOU HAVE A PIPE BOMB BLOWING UP IN YOUR FACE !
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