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", 14" and 20" Contender barrels for the cartridge.
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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", 14" and 20" Contender barrels for the cartridge.
- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | 7-30 Waters |- |- ! style="padding-right: 1em;" | Type | colspan="2" | rifle |- ! style="padding-right: 1em;" | Place of origin | colspan="2" | Image:Flag of the United States.svg United States |- |- |- |- |- |- |- |- |- |- |- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Specifications |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |-
- Why neck down a .30 cal. cartridge to 7mm? This quote from a review of the 7-08 Rem. (a .308 Win. case necked down to 7mm), provides the answer. There are two primary reasons a 7mm recoils less than an comparably effective .30 cal. cartridge: (1) to match the 7mm's ballistic coefficient requires a significantly heavier .30 cal bullet; and (2) to drive that heavier .30 cal bullet at similar velocities (for kinetic energy and wind resistance ("time-to-target")), requires more powder. This combination of heavier bullets with heavier powder charges significantly increases the recoil of the .30 caliber.
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| - Flat point
- Nosler Partition FP
- Round nose
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| - 120(xsd:integer)
- 139(xsd:integer)
- 154(xsd:integer)
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| - Cartridges of the World, 10th Ed., Barnes
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| - 1835(xsd:integer)
- 1940(xsd:integer)
- 1990(xsd:integer)
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| - rifle
- Rifle and single shot handgun
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| - 2347(xsd:integer)
- 2540(xsd:integer)
- 2700(xsd:integer)
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| - Why neck down a .30 cal. cartridge to 7mm? This quote from a review of the 7-08 Rem. (a .308 Win. case necked down to 7mm), provides the answer. There are two primary reasons a 7mm recoils less than an comparably effective .30 cal. cartridge: (1) to match the 7mm's ballistic coefficient requires a significantly heavier .30 cal bullet; and (2) to drive that heavier .30 cal bullet at similar velocities (for kinetic energy and wind resistance ("time-to-target")), requires more powder. This combination of heavier bullets with heavier powder charges significantly increases the recoil of the .30 caliber. The .30-30 Winchester is typically limited to short ranges, primarily because of the relatively small case capacity and the 150 grain and 170 grain bullet weights. To compensate for this, Waters necked the cartridge down to use a 7mm bullet (.284 inches), rather than the original .308 caliber (7.62 mm) bullet. Because it was designed to function in lever action rifles, the 7-30 maintained the same low working pressure, yet Waters' original design fired a lighter bullet (139 grains) at a higher velocity (2600 f/s). A typical .30-30 factory load fires a 150 grain bullet at 2390 f/s, while the current 7-30 factory load fires a 120 grain bullet at 2700 f/s. Muzzle energy is just over 1900 ft-lbs for both of these loads, but the lighter weight 7mm bullet has a higher velocity and flatter trajectory.
- 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", 14" and 20" Contender barrels for the cartridge.
- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | 7-30 Waters |- |- ! style="padding-right: 1em;" | Type | colspan="2" | rifle |- ! style="padding-right: 1em;" | Place of origin | colspan="2" | Image:Flag of the United States.svg United States |- |- |- |- |- |- |- |- |- |- |- |- ! colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;" | Specifications |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |- |} The 7-30 Waters cartridge was a wildcat cartridge developed by Ken Waters in the 1970s to give better performance to lever-action rifle shooters than the parent .30-30 Winchester cartridge. This is accomplished by using a smaller 7mm bullet pushed by a more generous charge of propellant. More gunpowder can be used because the parent cartridge dimensions have been increased slightly, resulting in more case capacity. This also prevents a 7-30 Waters cartridge from being chambered in a .30-30 Winchester firearm. Winchester (U. S. Repeating Arms) began production of their Model 94 rifles chambered for the 7-30 Waters in 1983. Thompson/Center chambers this round in their Contender single shot pistol, and reloaders can use pointed 7mm bullets for better down-range performance in the Contender. Factory loaded ammunition is currently available from major manufacturers such as Federal. This caliber is suitable for hunting game up to and including deer sized animals. The 7-30 Waters does not have a large following, based on scarcity of ammunition found in stores, and reloading die sales from the major reloading supply manufacturers (RCBS, Lyman, and others).
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