subnetting

We have a network with appoximately 300 nodes. We are currently set up with a class b subnet, and have our computers using 10.0.0.x, printers using 10.0.11.x, routers using 10.0.50.x, etc…

A consultant has come in and wants us to change our subnet mask back to a class C subnet, but keep our ip scheme the same. does this make sense?