I reload and shoot 11 of the calibers on the list plus some others. I've got to go with 3006. Jacketed bullets in my Garand and cast in my 03A3. Garands are just plain cool to own and shoot and my Remington 03A3 is probably my most accurate milsurp with cast. Close 2nd would be 6.5x55 in a couple M38's with jacketed bullets.