Originally Posted by LoboGunLeather

In my original trapdoor Springfields I have used the Lee 457-405F cast bullet with 26 grains of IMR 4198, standard primers, and a 2-grain tuft of dacron fiberfill under the bullet. Velocity is estimated at about 1100FPS, and my standard sight settings work well out to 200 yards. Recoil is negligible in the 11-lb. +/- 1884 Springfield.

In my 1886 Winchester I have gone up to 38 grains of IMR 4198, standard primers, and a 2-grain tuft of fiberfill. Velocity is estimated at about 1600 FPS. Recoil is brisk. This load shot through a bull elk from just behind the ribcage, through the lungs, and breaking the offside shoulder (about 4 feet of penetration) for an instant stop from about 80 yards.

I cast these bullets with a 50/50 mix of wheelweights and linotype metal, lubed with Alox but not sized (.459 lubri-sizer die). Actual weight is 388 grains, actual diameter .4582", with that metal. I have cast a few hundred of pure linotype that would be better for the heaviest charges, finished weight 370 grains, diameter .4585".

The fiberfill under the bullet provides good protection to the bullet base and is fully consumed. Either of the above loads will provide groups under 6" at 100 yards in my vintage rifles.

I have since gone to the 500-grain Lee gas-check mold which also works very well in the .45-90 Winchester and .45 2-3/4" Sharps.

I hope that your Marlin has standard cut rifling. The MicroGroove barrels do not handle cast bullets very well according to most reports.