I have three Cooper model 21's in 223, one Classic sporter and two Varminters. They were all are very accurate out of the box (5 shot groups of 1/2 or less at 100 yds) needing nothing except putting on a scope and shooting.

As far as the 204, I had one model 21 Varminter in 204, I no longer have it. I will let other chime in with their choices but my tag-line says it all for me.

drover

223 Rem, my favorite cartridge - you can't argue with truckloads of dead PD's and gophers.

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