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.7-30 Waters Ammo

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The 7-30 Waters cartridge was originally a wildcat cartridge developed by author Ken Waters in 1976 to give better performance to lever-action rifle shooters than the parent .30-30 Winchester cartridge, by providing a higher velocity and flatter trajectory with a smaller, lighter bullet.

By 1984, Winchester introduced a Model 94 rifle chambered for the 7-30 Waters, establishing it as a commercial cartridge. In 1986, Thompson/Center began chambering 10-inch, 14-inch, and 20-inch Contender barrels for the cartridge.

About: 7-30 Waters

  • Type: Rifle and single-shot handgun
  • Place of origin: United States
  • Designer: Ken Waters
  • Designed: 1976
  • Produced: 1984


  • Parent case: .30-30 Winchester
  • Case type: Rimmed
  • Bullet diameter: .284" (7 mm)
  • Neck diameter: .306 in (7.8 mm)
  • Base diameter: .422 in (10.7 mm)
  • Rim diameter: .506 in (12.9 mm)
  • Rim thickness: .058 in (1.5 mm)
  • Case length: 2.04 in (52 mm)
  • Overall length: 2.52 in (64 mm)
  • Primer type: Large Rifle
  • Maximum CUP: 40,000 CUP

Ballistic performance

Bullet mass/type Velocity Energy
120 gr (8 g) Nosler Partition FP 2,700 ft/s (820 m/s) 1,940 ft⋅lbf (2,630 J)
139 gr (9 g) Flat point 2,540 ft/s (770 m/s) 1,990 ft⋅lbf (2,700 J)
154 gr (10 g) Round nose 2,347 ft/s (715 m/s) 1,835 ft⋅lbf (2,488 J)

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