I'm trying to figure what cartridges are a true straight walled case. I want a rifle that I can run the case through just like it's a pistol case. I've read that the .45-70 isn't really straight and that it has a slight taper. Is this the case with the .444 Marlin as well? Why the heck didn't Marlin ever offer a .357 Maximum lever action??? Are there any modern rifle cartridges that are really true straight wall cases? Big Horn Armory offers a lever action in .460 and that would fit the ticket I guess. And they don't seem easy to find but Ruger offers the No. 1 in .460 as well. I just keep thinking there has to be something out there I haven't heard of that would fit the bill.