length actions. It's created by re-forming either a .338 Winchester Magnum or .308 Norma Magnum. P.O. Ackley favored short .30 caliber magnums and called it "highly recommended." Performance with a bullet is up to , with a bullet is up to and with a bullet is up to . .300 ICL Grizzly .300 ICL Grizzly' is based on the .300 H&H Magnum, and indeed the two are so similar that .300 H&H ammunition can safely be fired through a rifle chambered in .300 ICL Grizzly, as can the ammunition of another .300 H&H-based cartridge, the .300 Weatherby Magnum. The casings will fireform upon discharge. .30 ICL Magnum The .30 ICL is an improved .264 Winchester Magnum necked up to .270 and a pushed-back shoulder to create the steep angle common to all ICL cartridges and a long neck for improved handloading. Performance with a bullet is approximately and with a bullet is approximately . .300 ICL Magnum The .300 ICL is an improved .300 H&H Magnum. Performance with a bullet is approximately and with a bullet is approximately . .303 ICL Improved The .303 is an improved cartridge based on the .303 British and works well in Enfield and single-shot actions. Performance with a bullet is up to and with a bullet is up to . .37 caliber cartridges .375 ICL Kodiak The Kodiak is an improved cartridge based on the .375 H&H Magnum that is similar to the .375 Weatherby Magnum. Performance with a bullet is and with a bullet is up to . .375 ICL Magnum The .375 ICL is an improved .375 H&H Magnum. Performance with a bullet is approximately and with a bullet is approximately . See also List of rifle cartridges References Pistol and rifle cartridges Magnum rifle cartridges Cartridge families Wildcat cartridges