Yes, the 'X' die works as advertised, problem, reloaders do not understand the advertisement, first trim the case .020" before starting. As other reloaders like to say "Mileage Varies", RCBS does not claim the case does not grow/get longer, they advertise methods/techniques reduces the need for frequent trimming.
I am not vain, after trimming a case .020" because of multiple firings it is time to start on another case, however, there are reloaders that claim they fire a case 40+ times with no serious after effects, they do not know the weigh of the case before starting, they do not know the weight of the case after firing 40+ times, me? I had cases that were shot so many times they would not stand up without support, forget sizing, there was not enough brass in the case to allow the shell holder to to remove the case from the die. And I ask, is this the only case you have to fire? Are you reloading this one case over and over and etc.." First I offered to form 200 cases for his rifle, for free, he wanted a second opinion, he was sent to the man of few words, his case was pulled apart and measured for case wall thickness, .0025", he was told .002 is good for paper, then he was told he needed new cases.
F. Guffey