Elmer Keith 1899 -1984 Was a U.S western cowboy, big game hunter , hunting guide , rancher and gun writer who did much of the research that created the Remington .44 magnum. He was a major advocate of heavy cast .44 bullets shot at higher velocities for hunting who designed the Lyman 429421 .44 caliber cast bullet . Elmer Keith also was involved in the creation of the earlier .357 magnum.

For details on the set up on the Magma Star lube sizer see my video on it. I also have a set up video on the Lyman 4500 lube sizer