When fire forming my .30-30 Winchester cases into 7-30 Waters I had a bit of a surprise. See the attached photo of a fired case vs a full-length resized cartridge. I suspect the rifle barrel for my Contender was re-chambered to an Improved cartridge without the barrel being re-stamped. Can anyone visually confirm this?
My Cartridges of the World book seems to validate this based on the photos in the book.
Second question. Assuming I am correct, will a standard 7-30 Waters neck-sizing die perform the same as an Improved neck-sizing die? All reloads will be in a single Contender barrel.