Correct on all counts except the dies were actually made by Frank "Hemp" Hemsted in 1973. I cannelured the bullets with a C-H tool that put only about .140" shank in the case. I got 2000 FPS out of both 8 3/8" M29s and 6 1/2" Auto Mags. That load shot into 2 1/2" @ 100 yds. from scoped guns.
Hemp made beautiful dies at reasonable cost. He died of cancer Christmas night 1973.