Omni, It sounds like you have your seating die down to far, for example: I use a nickle as a feeler guage for all my seating dies as to not crush the shoulder on any cases that may be a tad longer than others. I adjust the seating die down on this nickle just so it bumps the die and then tighten lock ring. If you want to use a cartridge that you already have loaded to adjust seating stem, just loosen seating stem locknut and twist stem counter clockwise just a few turns then run your loaded cartridge up into die making sure your ram is in it's upmost position then adjust seating stem down until it stops. Dont do this on a cartridge that has been crushed already. This is one remedy that's easy to duplicate with all seating dies.