Well Yes of course one could just size the muzzle of the hull. If you've got the lathe though & are going to make one on it why not take a bit more time & make a full length one that'll do anything it might ever be called upon to do. You're only going to need it if you change guns to one with a smaller chamber size or if the hulls are damaged. Who's to say just where that damage may occur. I am also of the school that thinks the least amount you can work the brass the better, therefore am thoroughly convinced this is the ideal way to go. I don't have the specs on a 14 ga chamber but am guessing somewhere around .690"/.693" for the forward end next to the cone & about .702"/.705" at the breech.
If a brass case needs sizing at all it may need more sized than just the muzzle. No I have not tried using just a ring on an all brass case & No I don't intend to. This is of course all my opinion & it didn't cost anything so take it for whatever its worth to you.
