The wad cutter ammo must be completely flush mounted. About six months ago, I found some commercial reloads that protruded just a bit, maybe 1/32". They absolutely would not feed.
Not to worry, I tell myself. I'll just put them in my RCBS seater die, and seat the WC's a bit deeper. No such luck. I'll run them through my Model 14 or my Colt OMM.
You may want to check locally to you. Sometimes remanufacturers will have them in stock. They're getting rarer however. Most indoor ranges won't allow unjacketed ammo, even wad cutters. I've located some copper-coated WC's, and they seem to work just fine.
For the most part, I buy the 148gr WC's, and load my own. I have a set of dedicated RCBS dies, and I get pretty good quality reloads. It doesn't take much Bullseye to get it 25 yards.