I have heard that the Contender .32 barrels are actually .308 bore. Of course I have also heard that so long as a cartridge fits in the chamber that the fatter bullets often shoot better than the skinnier .308 or .309 ones. I'll have to experiment and see. I shoot primarily my own cast bullets anyway, so I can always size them to whatever I determine works the best. A dummy .32 H&R with a .314 135 grain bullet I had lying around from working up a load for my Single Six dropped right in the chamber.
As for the rest, I already have two additional barrels on layaway, a 10" .22 Hornet and a 14" .30-30 Winchester. Once those are paid off I "need" .32-20, .41 Magnum, and .44 Magnum barrels too.