What I read was that Lee has virtually declared war on Federal primers. At least Federal Match primers - the kind that come in the huge box that holds the primers far-separated and on their sides. Apparently, and according to Lee, these are so soft as to be dangerous - at least in the traditional "round" Lee priming tool. Hence Lee has come out with a "safer" alternative where detonation of the primer being rammed home will not detonate the remainder of those in the tray.

My new triangular "safe" Lee priming tool works about one-tenth as well as the old round model that I finally wore out. The new triangular tray model is a major pain the hind-end but it does work - sort of. Spilling primers as I'm loading this thing up is now a regular occurrence and it was pretty rare with the old, reliable, round job.

By the way, I took a chance before I needed a new one, and loaded Federal Match primers on the old, circular, Lee priming tool, and never had an issue.