.240 Weatherby Magnum
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The .240 Weatherby Magnum was developed in 1968 by Roy Weatherby. In the development of his own .240in/6mm 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. The .240 Wby. Mag. is a proprietary cartridge used only in Weatherby rifles. It utilizes a double shoulder and a belted case with the same base diameter as the .30-06 cartridge. Case overall length is 2.5in, significantly shorter that the 2.85in case of the .244 H&H Mag. While favoured by 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. 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.
[edit] Specifications
Base diameter: .473"
Bullet diameter: .243"
The following loads are from utilizing a factory 26" test barrel and a Nosler Partition bullet.
Trajectory
Path of Bullet
Bullet Wt. 100 Yds 200 Yds 300 Yds 400 Yds 500 Yds
100 grains 2.8 3.5 0 -8.4 -22.9
Energy
Energy (Foot-Pounds)
Bullet Wt. Muzzle 100 Yds 200 Yds 300 Yds 400 Yds 500 Yds
100 grains 2576 2183 1844 1550 1294 1073
Velocity
Velocity (Feet per Second)
Bullet Wt. Muzzle 100 Yds 200 Yds 300 Yds 400 Yds 500 Yds
100 grains 3406 3136 2882 2642 2415 2199
[edit] References
http://www.chuckhawks.com/240weatherby.htm http://www.reloadbench.com/cartridges/240wm.html http://www.weatherby.com/products/ammo.asp?prd_id=2
