You may have an issue if you are not using a hornady case holder die with your sizing die. Your options are removing material off the bottom of the sizing die, or you can cut some shim the size of the case to put in the the case holder die to raise the case in the sizing die(.010" shim or feeler gauge should work), or you can send fired cases and die set to hornady to have them machine off bottom of sizing die to match your case.