I generally try to buy new, but I have picked up a few sets of used dies, over the years.
If I have a chance to inspect them, then there's very little risk.
If I don't have a chance to inspect them, then the price has to be low enough for the risk to be worthwhile. (Which it never is, in my opinion, on auction sites.)
About 5 years ago, I bought two sets of .223 Remington dies from a local guy that kept getting cases stuck so hard in the sizing die that he couldn't get anything to pull (or push) them back out. Before committing to the deal, I already knew that he had taken a torch to one of the dies, in an attempt to "solder" the stuck case to another piece of brass (to pull it out with pliers
). In doing so, he just filled the die up with solder and semi-permanently fixed the case and expander in place.
But, had it been a sight-unseen purchase, I would have been EXTREMELY mad if a die advertised as having a stuck case turned out to be a die with a case
soldered in place. ...Even at $15 total for both sets of dies.
(I got one case out with barely any effort. The one full of solder got sent to RCBS with the $7 'stuck case' fee and a note explaining exactly what had been done. They kept the check, but sent me a new die and extra storage box.
)
There's always some risk with used dies. Even if you can inspect them before buying, you may later discover that the .270 Winchester sizing die actually has a .25 caliber expander in it. Or, the dies might look great, but end up scratching your brass.
You never know.
But, if the price is right, it's a risk that I'm willing to take. ...Except with Lee dies. Their warranty is crap, and most of their dies are bad when they leave the factory.
(The usual suspects will now jump all over that and call me a snob, but that opinion is based on
experience with Lee dies - not an unfounded desire to pay more for a tool, as the "anti-snob" crowd loves to accuse.)