I have the latest Woodleigh catalogue infront of me and the only 423 diameter bullets listed are as follows:-
10.75x68mm =.423
347gr RN SN
347gr FMJ
So that is probably why you havent been sent any.
They dont make them!

Also listed is the following:-
404 Jeffery = .422
400gr RN SN
400gr FMJ

Have you tried dealing direct with Woodleigh ?
Al