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With the .375 you would need a 300 grain bullet with a muzzle velocity of 2100 fps to get 3k lbs of energy at the muzzle.
That would mean you would have to load a .38-55 case (approximately 1/8" longer than a .375 case) with 'bout 35 grains of AA1680 and the COL of 2.675" to accomodate the larger bullet. Seems we would be pushing the pressure envelope too! be careful!
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