Derivative Cartridges
In addition to the most common factory derivations, the .25-35 Winchester, 6.5x52R and the less well known .219 Zipper, the .30-30 has also spawned many wildcat cartridges over the years. One of the more successful is the 7-30 Waters, made by necking the .30-30 case down to 7 mm (.284 inch). The 7-30 Waters eventually moved from a wildcat design to a factory chambering, with rifles being made by Winchester, and barrels made by Thompson/Center for their Contender pistol. Other .30-30 based wildcats are used almost exclusively in the Contender pistol. One of the more notable examples is the .30 Herrett, a .30-30 case necked back to reduce case capacity for more efficient loading with fast burning powders. The .30 Herrett produces higher velocities with less powder than the larger .30-30 case in the short 10 and 14 inch (25 and 35 cm) Contender barrels. Other examples are the .357 Herrett, developed to handle heavier bullets and larger game than the .30 Herrett, and the 7mm International Rimmed, a popular metallic silhouette cartridge. Bullberry, a maker of custom Contender barrels, offers proprietary .30-30 wildcats in 6 mm, .25 caliber, and 6.5 mm diameters. In addition, P.O. Ackley used the cartridge as the basis for the .30-30 Ackley Improved.
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