I believe it's a Black powder Express rifle or BPE. You can load smokeless powder in it as there is a conversion factor to substitute black powder for smokeless. A 750 gr bullet is one big chunk of lead no matter what the propellant is.
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There is no hunting like the hunting of man, and those who have hunted armed men long enough and liked it, never care for anything else thereafter...Earnest Hemingway
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