In 1977, Ken Waters, technical editor of Handloader and Rifle magazines, began developing a 7mm wildcat on the .30-30 case. Ken's primary objective was to design a modern high performance cartridge that operates at chamber pressures compatible with Winchester Model 94 and Marlin Model 336 rifles. In 1984, U.S. Repeating Arms announced the availability of the 7-30 Waters chambering in a Winchester Model 94 with a 24" barrel. In 1986 Thompson/Center began chambering 10", 14" and 20" Contender barrels for the cartridge. The 7-30 Waters has proven its capabilities in the field on big game weighing up to 300 pounds at woods ranges. 

This text is based on information from “Cartridges of the World”, Hodgdon reloading manual, the cartridge designer and/or own resources.