I have done it, mostly with a Lee Classic Loader. As long as you keep the lube out of the case, I can't see a problem. When I was a young fellow, I bought some "30-40 Krag" ammo from an outfit in Texas that purporped to be military, but was actually 303 British ammo (with .311 bullets) that had resized cases. NRA made them take the ammo back and refund purchase and shipping costs. The point is that they were able to resize the brass with the primers, powder, and bullets all in place.