You could press bullets to increase their diameter with a die and a hammer as described in Wright's book.
Will your fired cases allow a bullet of .470" to chamber?
If you have any .45ACP brass laying around, they are about .470" and if your fired brass will accept one, can give you an idea if that size bullet will even chamber. (of course, if a .470" bullet is what you need, they can be made out of .45ACP brass too)
You may be in a position where your barrels want a bigger bullet but your chamber may not allow it.

Have you tried a load using black powder?
If your bullets are cast soft enough, they may bump up and fill the grooves better.

Also, if you are dead set against paper patching, I would stick with cast grease groove bullets. It would get pretty expensive experimenting with Woodleigh BPE bullets and you may be chasing your tail with harder jacketed bullets.