abner , I have (3) 30-30 AckImp barrels. I have done case forming 3 ways. Fire factory, reloading range brass, and loading new brass. ALL worked well with only one case splitting upon firing ,a reload w/AA5744 powder. Oops ,I forgot that I've pulled bullets from factory 7-30 Waters. Then the decapping stem from AckImp sizing die is removed to save factory primer & reloaded same weight 30 cal bullets w/factory powder charge. works great also. Enjoy your AI. My 1st AI cases (less one) are almost 20 years old & fired MANY times !