Tom,
You'r right about the 30-30,plus the world is full of the cases.I use it for everything I can. I make 8.15x46R cases from it even though 8.15 is avaliable. I think the pilot of a reamer for the normalized case with .366 bullet will fit a .357 bore. It won't fit either of mine, one has .358 groove- the other is .359. Solid pilots can be easily reground with a toolpost grinder,or a "moto tool" setup in a boringtool holder. Of course you either have to own it or have permission.