Turn of last century, smokeless made autos (and pumps) possible. Winchester was milking the lever action. Remington got "out front" with autos and pumps. Data for reloading and pressures should be about the same for .25/35 Winchester round. Lyman has data for alot of these "obsolete" rounds. I thought that the .30 Remington was a bit larger at the base than .30/30 so making cases is a pain. Huntingtons.com (RCBS Custom Shop) and ch4d.com and others make case forming dies. As said, some .30 Remington cases are supposed to be available. Not real common. And some European cases that could be used with difficulty. And if you only want to shoot a small amount, the pricey ammo becomes a lot better "deal." luck.