ICL cartridges (ICL stands for Increased Case Load) are rare hunting wildcat cartridges developed by Arnold & Vern Juenke,[2] gunsmiths who owned Saturn Gun Works in Reno, Nevada.

They feature a 45 degree shoulder[3] and the sides are straightened out compared to the parent cartridge.

It is one of the most complete lines of wildcats, having a large number of cartridges with a variety of calibers.

[3] Performance with a 45-grain (2.9 g) bullet is approximately 3,750 ft/s (1,140 m/s) and with a 55-grain (3.6 g) bullet is approximately 3,450 ft/s (1,050 m/s)[8] The Marmot is based on the .220 Swift with improved characteristics such as steeper sides and shoulder angle, but is not improved in the sense that you cannot fire form factory ammunition in its chamber.

Ackley noted that it is more efficient than standard .220 Swift improved cartridges, and not over-bore.

[15] The 6.5 ICL is an improved .264 Winchester Magnum but with a longer neck for easier handloading.

[20] The Wapiti is a more complicated wildcat based on the .300 H&H Magnum being necked-down, trimmed, and then fire-formed.

[21] The Tornado is based on a .257 Roberts case that is improved and necked to .30 caliber, essentially the same as the .277 ICL Flying Saucer, but necked-up.

[23] The Grizzly Cub is a shortened magnum for standard length actions.

Ackley favored short .30 caliber magnums and called it "highly recommended."

[24] .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.

[26] The .30 ICL is an improved .264 Winchester Magnum necked up to .308 and a pushed-back shoulder to create the steep angle common to all ICL cartridges and a long neck for improved handloading.

[28] The .303 is an improved cartridge based on the .303 British and works well in Enfield and single-shot actions.