I haven't been on the site since my last post, didn't know there were so many cast shooters here.
Here's the particulars of the loads that work best in my Krag. I decided to only use molds I already had, due to the pitted condition of the bore not warranting buying molds just for this gun. My alloy is straight clip on wheel weights and my lube is home-made FWFL (recipe on "cast boolets") The barrel slugs .309. I use 20.5gr 4227 with the 311299, velocity of 1500fps. I shoot them as cast, they drop from the mold at .311. Next best load with that bullet is 16.5gr 2400 at a little over 1400fps. My 311291 is a plain base. The mold was slightly damaged at the base from someone trying to pry a bullet out. I had access to a mill where I worked, so I removed the gas check shank to clean up the damage. 7.5gr of Red Dot is the load it likes best, about 1150 fps. I shoot it as cast too, it drops at .3105. Other molds I tried were 3118, 31141, 311227, 311334 and a Lee 150gr flat point. Other than the 31141, the others were probably too short for the Krag throat for any accuracy. No idea why the gun didn't like the 31141, best I could get it to shoot was about 5" at 100. Powders tried with the various bullets were 4227, 2400, Red Dot, Unique, 4198, 3031, 4895.