New elr monsters and one old one. cartridges listed from rt to lt 375 Mercenary , 420 Blitzkrieg, 416 colossus and the 458 Goliath the 2nd photo is the Goliath next to a 243 wssm improved. Care to take a guess where the design came from ???? lol. Here in a few weeks we will post all our new elr cartridges and the action that are needed to run them the colossus and Goliath are different in the case head internal design is a pressure and ignition management design that allows for higher pressure and the hotter you run the case the tighter the primer pocket gets. the ignition design allows you to run a standard magnum primer. with no delay in ignition