Push feed M-70's, IMO, are a real sleeper. If the rails are like my M-70 .375 H&H SS Classic, the Nosler cases will pass between the rails easily with room to spare. I'd use that action for a Nosler build, if that was my choice.

If a M-70 RUM box is hard to find, you can cut windows in that one for the same effect.

I've used the Larry Willis body die for belted mag cases and it does work. It has a go/no-go gauge to let you know if a case needs sizing.

DF