When it comes to a small base die, I have had to improvise a few times. I had a Savage 99 in 243 that had a tight chamber, factory ammo-OK, full length sized would not chamber, needed to load NOW!!! I had a 30-06 SB die on hand, I pulled the decapper/expander rod out of it and then ran the 243 cases in the Sb die and then ran them thru the 243 Full length sizer. It accomplished the needed down sizing to make the loads we needed with out buying a 243 SB die. Eventually I did upgrade to a 243 Sb set, but we got thru with a little ingenuity.