I have an old Herter's Mod 0-3 Super single stage press the holders are caliber specific and use set screws to hold in place. The one that's in it works for 30-06 and the priming arm works for it. I'd really like to find the shell holders for 44mag/45 colt, 38 special, 30/30, 45/70. I have an adapter to modern holders but the primer arm comes up to short. Any advice would be appreciated. Thanks