Apparently there was a .234 RCBS at one point.
http://www.shootersforum.com/wildcat-cartridges/73347-234-caliber.html
I have bullet charts from most every bullet manufacturer hanging on my man cave wall. Hornady, Sierra, Barnes, Etc, and none list a .234, so I'm looking at factory rounds, and MAYBE it might have been a .234 wildcat.
It would be interesting if it was taken that wildcat round.