Skeeter, I've read all this stuff about 44 Marlins and their obsolete twist rate and bad accuracy, and all I can say is try it in YOUR gun and see. My guns can't read, and I don't believe everything I hear, so I tried some Meister 300-grain hard cast lead slugs in my 1894SS, just to see for myself. I generally shoot at 50 yards, and my WORST groups were about an inch, most of them closer to half that. I tried several powders from Unique to Lil Gun, and the results were pretty consistent. They were NOT firewall handloads, most about 15% below the listed max loads. There was some recoil, as expected, but nothing too brutal for my 85-pound son. And he does NOT enjoy recoil, he has no padding, nothing but bones. He thinks they're fun to shoot, in limited quantities. Try them and see!
Papajohn