Loosely based on a shortened .404 Jeffery case with the rim rebated to the .535-inch case head of the H&H family, the .270 WSM was the third commercial cartridge using the .277-inch bore diameter, and betters the velocity of the .270 Winchester by 200 to 250 fps.
The 7mm cartridges are a fantastic all-around choice for any hunter pursuing our most common species. Between the .280 Ackley Improved and 28 Nosler, which comes out on top? Contributor Philip Massaro takes a closer look at the pros and cons of each.
Developed in 1976 by Ken Waters as a wildcat cartridge, the 7-30 Waters is based on the .30-30 Winchester necked down to 7mm to improve velocity and trajectory, with a significant drop off in felt recoil. In 1984, Winchester began to produce rifles chambered for cartridge, legitimizing Waters’ dream, and establishing it as a commercial cartridge.