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colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;"
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| .240 Weatherby Magnum colspan="3" style="text-align: center; font-size: 90%; border-bottom: 1px solid #aaa; line-height: 1.25em;"
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| 300px
Type Rifle Place of origin USA colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;"
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| Production history Designer Roy Weatherby Designed 1968 Manufacturer Weatherby colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;"
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| Specifications Bullet diameter .243 in (Expression error: Unexpected < operator.
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 mm
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Neck diameter .272 in (Expression error: Unexpected < operator.
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 mm
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Shoulder diameter .429 in (Expression error: Unexpected < operator.
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 mm
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Base diameter .453 in (Expression error: Unexpected < operator.
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 mm
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Rim diameter .472 in (Expression error: Unexpected < operator.
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 mm
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Case length 2.496 in (Expression error: Unexpected < operator.
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 mm
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Overall length 3.100 in (Expression error: Unexpected < operator.
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 mm
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Rifling twist 1-10" Primer type Large rifle colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;"
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| Ballistic performance Bullet weight/type Velocity Energy style="vertical-align:middle; border-bottom: 1px dotted #aaa;
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" | 60 gr (Expression error: Unexpected < operator.
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"|3,817 ft/s (Expression error: Unexpected < operator.
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" | 75 gr (Expression error: Unexpected < operator.
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Source: Hodgdon [1]

The .240 Weatherby Magnum was developed in 1968 by Roy Weatherby. In the development of his own .240in/6 mm cartridge, Weatherby was significantly influenced by both the success and the limitations of the .244 H&H Magnum cartridge devised in England by his friend and colleague David Lloyd. It was the last cartridge to be designed by Roy Weatherby.[2]

DesignEdit

The .240 Wby. Mag. is a proprietary cartridge used only in Weatherby rifles. This particular Weatherby case is unique, other than shape, it isn't physically based on other Weatherby cases, having the same rim diameter and similar length as the .30-06. It utilizes the traditional Weatherby rounded double shoulder and a belted case with a length of 2.496in, significantly shorter than the 2.8in case of the .244 H&H Mag. [3]

PerformanceEdit

In terms of velocity, the .240 Weatherby is the fastest commercially produced 6 mm cartridge. There are of course several faster wildcat rounds available, but the .240 Wby outclasses the 6 mm Remington and the newer .243 WSSM by about 150 fps. [4] While favored by some varmint hunters, the .240 Wby. Mag. is not much liked by some reloaders because the case cannot be formed out of any other brass; one either has to buy Weatherby ammunition or reload used Weatherby cases which tend to be more expensive than those for more common cartridges. With the heavier bullets the .240 Wby. Mag. makes for a good deer hunting cartridge, but it does tend to require a long (>23in.) barrel in order to achieve peak performance.

Performance for 100 grain bullet from utilizing a factory 26" test barrel and a Nosler Partition bullet)
Muzzle 100 yd 200 yd 300 yd 400 yd 500 yd
Trajectory 2.8 3.5 0 -8.4 -22.9
Energy (ft·lbf) 2576 2183 1844 1550 1294 1073
Velocity (fps) 3406 3136 2882 2642 2415 2199

CategoriesEdit

Cartridge:rifles
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