[stagpanther]

The bugger is expanding the neck out with to 308. That additional diameter is going to have to displace the intersection of the neck and shoulder. That's the critical intersection that has to be just right or the cartridge won't chamber. On my Wilson 30 BR die when making a pass on the neck after enlarging it through a mandrel the bushing does not seem to go down far enough the neck (I've already trimmed the case length at that point)--what's happening is that there is a "flare" of the neck diameter at the shoulder junction that exceeds the chamber neck diameter of .330. From what I've read the goal is to get a functional cartridge that can fit and then be properly fire-formed. This isn't my first ride on a wildcat that needs case reworking and fire-forming; but it's been one of the most challenging so far.