I know of a company in Cincinnati, OH that I bought new brass from for my .458. I also bought 45-70 bullets too (.458 dia). My only other source of brass was to buy new ammo from Midwest USA. I am just starting to reload and could use some more input on the .458 SOCOM. I know you have to lube the heck out of them when you resize them. Other than that I am just trying to get set up for making rounds this winter.