RE: .223 OR .224 Bullets?
.224cal for 22-250, and most other modern .22cal centerfire cartridges for that matter. To my knowledge, only older production .22 Hornet rifles used .223cal bullets. But I believe that current production .22 Hornet rifles are bored for .224cal bullets.
Just out of curiousity, doesn't your reloading manual state that the 22-250 uses .224cal bullets? I'd be surprised if it didn't.
Mike