Originally Posted by
Bent Ramrod
Sometimes one with the nonadjustable chamber that was heavily used in antiquity (or one that’s been allowed to rust inside and has been polished out) will give a lighter or nonexistent crimp on the shell. To be fair, some batches of semi-obsolete shells are shorter than the standard lengths of the old days, causing the same problem. If you have the single- or double-adjustable chamber (or don’t need to crimp) this won’t be an issue.
Otherwise, the things are bricks. I worry more about rust and abuse in the mould cavity than any prospect of the tool wearing out. Of course, I use them (some in NRA Beat-Up condition) occasionally for nostalgia’s sake rather than routinely for high volume production. The ammunition so made shoots as well as any made by other means.