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The 500 magnum in a rifle... wow. If the 400 grain load gains 300 fps from the long barrel, it will have energy levels about equal to a 35 whelan... it is bumbping up against the 338 win mag. That is a lot of cartridge in a light weight lever gun.
The 357 magnum gains about 300 fps going from a 6 inch revolver to a 20 inch rifle...
Jim
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