I've actually had one before they ever came out....mine was built on a Remington action and the 223 case. A great little round and a fine coyote killer.....prairie dogs are also toast when that thing gets out of the case.

As good as it is, I still like my .223 and especially the 40 grain loads for it.

Darn thing is dirt cheap to shoot.....shoots about 3,800'/sec...extremely accurate (its a sako) and has about the same range as the .204.

Go ahead and get a .204.....you'll like it but it won't really do much that the 223 won't do.