Anyone use this caliber? I have new dies and 15 boxes of new Remington brass for it, but don't have one.

Sounds like you should obtain a rifle so chambered!

I own three of them (and have a couple of friends who also shoot this caliber.) All of us are greatly pleased with the performance of the .222 Magnum.

Neck them up to 6mm and barrel a rifle for such. It would be what many benchresters use to shoot. Quite accurate.

Somebody grabbed them and the dies as well.

No

I rechambered an NEF 223 to 222RM to straighten up a slightly oval, longthroated chamber. It shoots a WHOLE lot better in the 222RM configuration even with the ~0.003" fired case bulge.

I'm getting ~3350fs with several powders and 50 gr bullets in the 222RM...the 223 was giving ~3100fs...good comparison as the barrel is the same only the chamber was changed. Accuacy is running slightly over 1/2"/100yds, 5 shot groups.

Good enough for sage rats and not bad for an NEF single shot not totally tricked out.

Luck

I've got Rem 722 in 222mag and I got my custom 222Mag on Rem 700 action couple months ago used a 1/12 twist barrel. good caliber.