The .44 Special and the .44 Magnum are both .430 but I believe the .444 Marlin is slightly smaller at .429. At least that's the info I have available. The bullets themselves are probably constructed differently though because of the difference in velocity. I am going to edit this to say I have seen both .429 and .430 for the .44's.
Last edited by 1sailor; 07-30-2021 at 05:49 PM.
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