.470 Capstick
| .470 Capstick | ||||||||||||||||||||||||
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| Type | Rifle | |||||||||||||||||||||||
| Place of origin |
 USA
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| Production history | ||||||||||||||||||||||||
| Designer | LTC. Arthur B. Alphin | |||||||||||||||||||||||
| Designed | 1990 | |||||||||||||||||||||||
| Manufacturer | A-Square | |||||||||||||||||||||||
| Specifications | ||||||||||||||||||||||||
| Parent case | .375 H&H Magnum | |||||||||||||||||||||||
| Case type | Belted, straight | |||||||||||||||||||||||
| Bullet diameter | .475 in (12.1 mm) | |||||||||||||||||||||||
| Neck diameter | .499 in (12.7 mm) | |||||||||||||||||||||||
| Base diameter | .513 in (13.0 mm) | |||||||||||||||||||||||
| Rim diameter | .532 in (13.5 mm) | |||||||||||||||||||||||
| Case length | 2.85 in (72 mm) | |||||||||||||||||||||||
| Overall length | 3.65 in (93 mm) | |||||||||||||||||||||||
| Rifling twist | 10 | |||||||||||||||||||||||
| Primer type | Large rifle | |||||||||||||||||||||||
| Ballistic performance | ||||||||||||||||||||||||
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Test barrel length: 26 in Source(s): Cartridges of the World |
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The .470 Capstick is a rifle cartridge created by Col. Arthur B Alphin from A-Square in 1990, named after writer and hunter Peter Hathaway Capstick. It is based on a .375 H&H Magnum case blown out and necked to accept a .475 inch (12 mm) bullet. With 500 grain (32 g) bullets, it can achieve 2400 feet per second (730 m/s) muzzle velocity from a 26" barrel.
Although it is not very flat shooting because of slow velocities, it is flat enough for use out to 250 yards (230 m). It transmits an extreme amount of power at over 6,000 ft·lbf (8,000 J) and is designed for use on dangerous game out to 200 yards (180 m). Like other large cartridges, the high energy performance is accompanied by a large amount of recoil.
The Capstick is very similar in dimension to the .470 Ackley, but where the Ackley uses a 600-grain (39 g) bullet, the Capstick uses a lighter 500-grain (32 g) bullet for a better trajectory.
The .470 Capstick is a belted magnum with the same rim and belt size as a .375 H&H. The case has a length of 2.800 inches (71.1 mm), and the overall cartridge length is 3.65 inches (93 mm). A cartridge drawing is shown below for dimensions.
The .470 Capstick will fit in the same length action as the .375 H&H Magnum and .458 Lott. Actually the .458 Lott is a good measuring stick for the .470 Capstick. The Capstick has a bullet that has 7% more cross sectional area than the .458 Lott, which, in theory, would result in more shock transfer to game and a larger wound channel.. As for powder capacity and velocity, they are similar, with the .470 Capstick having a slight edge in powder capacity and therefore a slight edge in theoretical velocity. However, for field use the .470 Capstick and .458 Lott should have identical performance because the differences between them are rather small.
That being said, the differences in field results between the .458 Winchester Magnum and the .470 Nitro Express should be nonexistent, because both push a 500-grain (32 g) bullet at 2,150 ft/s (660 m/s) But some people have noted an observable difference in the way shot game behaves with those two cartridges, possibly due to the greater cross sectional area of the .474” bullet. If desired, the .470 Capstick can be used to create a ballistic twin to the .470 Nitro Express, pushing a 500-grain (32 g) bullet at 2,150 ft/s (660 m/s) while generating low pressure.
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Wikipedia