Lately I've been kicking around some ideas for a pair of wildcats for Marlin Lever Action rifles quite a bit. The idea is to use the .338 Marlin Express as a the basis for a larger cartridge that just surpasses the .348 Winchester and a smaller cartridge that's more focused on the kind of deer...

Hey guys. I'm new to the forum and reloading and had a question about reloading .338 win mag. I have a RCBS 2 die set and deprimed and resized a couple of cases. I noticed the neck diameter chg from .370 to .360 and the case length grew .015". I checked SAAMI spec and it calls for a .370" dia...