I have heard nothing but good things about the Wolf Gold brassed cased .223. It has no bi-metals in the bullet so it isn't magnetic, and from all the reviews I've read, it's been 100% reliable and fairly accurate (1.5" groups at 100 yards with 5-10 shot groups). I have never bought Wolf ammo since I don't shoot steel cased ammo out of my guns, but since this is brass cased ammo with so many positive reviews, for that price I think it may be a great option for plinking ammo right now.
I just picked up a case from the-armory.com for $339/1,000 so I'll let you know how it shoots when I get it
“Owning a handgun doesn't make you armed any more than owning a guitar makes you a musician.” - Jeff Cooper