I've discovered that some of my 5.56 and .308 handloads may have been or were fired from a tapered chamber such as a MG; and they will not fully chamber..... I've done all the routine case preps, and the cases that are sticking, show a witness mark @1/8" above the rim. I'm looking at getting the RCBS Small Base Dies for future loads.. Wondering how I can SAFELY resize the cartridges I have already loaded and are measured to be too wide at the base. Would using a sizing die without the decapping pin work? Would this be a suicide mission?