Bolt action .458 socom mag off shelf option

pc3

Sergeant
Full Member
Minuteman
May 26, 2008
775
3
Australia
Hi folks I own a bolt gun in .458 socom, built using a stiller and in a manners mini chassis stock. Currently using a 5 shot .308 Ai mag with lips opened slightly, it doesn't feed that great. I'd like to buy a mag that fits in a mini chassis that's made for the .458 socom does anyone know what brand if there is one available ?