Based on the .45-70 case, this proprietary cartridge is made popular because of its big power but manageable recoil.
Starline Brass Star480REUP5 Unprimed Cases 480 Ruger 50/Pack
RELOADING - BRASS - Page 7 - Shooting Surplus
Starline Brass Star480REUP5 Unprimed Cases 480 Ruger 50/Pack
Store Rifle, Handgun, and Pistol Brass
Starline Brass Star480REUP5 Unprimed Cases 480 Ruger 50/Pack
Starline Brass .480 Ruger Unprimed Brass Large Cartridge Case, 50
Starline Brass .480 Ruger Unprimed Brass Large Cartridge Case, 50
Starline Brass 480 Ruger Bag of 100 (Bulk Packaged)
Starline 480 Ruger Brass 100 Per Bag - Brownells Australia
Starline Brass STAR50BEOEUP Handgun 50 Beowulf Brass 50 Per Bag
Starline Brass .480 Ruger Unprimed Brass Large Cartridge Case, 50