I built a home made one several years ago that seems to be gone forever! This was the best one I've ever used, and left zero marks on the bullet. It used a piece of grade eight all thread that had the I.D. reamed for Ericson "B series" collets. You can get the collets in just about anysize they make a drill bit in. Collets are expensive, but I managed to find them in the trash can often enough to get everyone I needed. But as I said that one has disappeared (probably loaned it out never to be seen again). I didn't keep the reamer I used to create the I.D. with, and that makes that idea out of the question these days. Forster collets are about ten bucks a piece, and by the time I buy two or three more (there were things I didn't like about the Forster) I might as well buy something I like a little better. So I think I'll just get the Hornaday and be done with it.
By the way I've debated about posting this subject for a few weeks (why I'm pulling these bullets), and maybe I ought to run this one by all of you. The rounds belong to my brother. All of them have either Sierra 117 grain bullets or 85 grain Nosler BT's. He used four different kinds of powder (all IMR stuff) and mostly CCI match quality primers. Cases were cleaned in his RCBS tumber, and were very clean (I know how he does things). He used RCBS case lube when he sized the brass. Something reacted inside the cases to kill the powder! It actually solidified the powder into something that looked like a cinder! The case O.D.'s were badly etched as well. But the primers are still live! The only thing we can see is that there was somekind of a reaction with the case lube and the powder! The 117 sierras were heavilly corroded into the shoulder, but the Noslers look OK. Sad thing is that a lot of the cases were the thin wall .257 Roberts cases that make really nice 6mm rounds.
gary