I have a Marlin in 45 Colt. It shoots the original lead bullets best. I bought a couple of boxes of 300 grain jacketed bullets, as I too thought they would be better for hunting. Groups like you mentioned in your post. The lead bullets are .454 while the jacketed are .451. I bought a box of Cor-Bon 335 grain lead factory loaded ammo that also shoots very well in my Marlin. I am useing Blue Dot as my powder of choice in the 45 Colt.
Ralph
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