Recent testing with cast bullets shows me that top or full power loads work best in my 2007 Handi in 44 magnum. If you cast the bullet, leave it unsized, dip lube it and push it to top velocities it won't lead the barrel. Well it didn't lead mine which are cast from wheelwights and dropped from the mold into a 5 gallon bucket of water. My cast bullet is a Keith semi wadcutter without a gas check. This all said I am looking into getting a 300 grain mold to test with this rifle. If you push your bullets too slow they won't stabilize in the 1 in 38 twist. I think too slow might be under 1400 fps.