T-nut, I've been neck-sizing for the .358 for years with a .350 Remington Magnum F/L sizing die, and it's worked great. Bought the die at a gun show for 5 bucks. I'm sure you'll be pleased with the Pac-Nor. FYI I worked up a great deer load with AAC- 2015 and 225 grain sierra SPBT's. Regards. RE