Hey shooters need some help here. There is a company that makes a die for complete sizing of belted magnums. I had contacted them a few years ago but have since lost the name or address. Can you help me out. Thank you, ElDee.
Innovative technologies is the one I have, but to date have never had the need to use it. The primer pockets usually loosen up before I need to size that last little bit. The die has a measuring end that you drop the case through and mine have always been fine.
I just grind down a spare shell holder a 100 thous. and use a 300 Win Mag FL die to size down to the belt on my Rem 7 mag. brass. This doesn't push the shoulder back and create headspace problems. You could use a 300 WBY die to do 300 Win mags. Smooths the brass down to the belt. Randy