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.240 Weatherby Magnum

Rifle cartridge

Field	Value
name	.240 Weatherby Magnum
image	Munit04.jpg	image_size = 300px
caption	.240 Weatherby Magnum (1st from left)
origin	USA
type	Rifle
designer	Roy Weatherby
design_date	1968
manufacturer	Weatherby
case_type	Belted, bottleneck
bullet	.243
neck	.272
shoulder	.429
base	.453
rim_dia	.472
case_length	2.496
length	3.100
primer	Large rifle
case_capacity	64
max_pressure	65000
rifling	1 in 10 in
bwround	1
bw1	60
btype1	HP
vel1	3817
en1	1942
bw2	75
btype2	HP
vel2	3555
en2	2105
bw3	80
btype3	SP
vel3	3514
en3	2194
bw4	90
btype4	SP
vel4	3394
en4	2303
bw5	100
btype5	HP
vel5	3202
en5	2277
balsrc	Hodgdon

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.

Design

The .240 Weatherby 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 a similar length to 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.

Performance

In terms of velocity, the .240 Weatherby Magnum was once the fastest commercially produced 6 mm cartridge. There were several faster wildcat rounds available, but the .240 Wby. Mag. outclassed the 6 mm Remington and the newer .243 WSSM by about 150 ft/s. However, the lightweight .243 WSSM 55gr Ballistic Silvertip now outpaces Weatherby's offerings according to some. Loading data from Western Powders puts the .240 Wby. Mag. at over 4,000 ft/s with a 62 grain Barnes bullet.

While favoured 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 heavier bullets the .240 Wby. Mag. makes for a good deer hunting cartridge, but it does tend to require a long (23 in.) barrel in order to achieve peak performance.

Muzzle	100 yd	200 yd	300 yd	400 yd	500 yd
	2.8	3.5	0	-8.4	-22.9
2576	2183	1844	1550	1294	1073
3406	3136	2882	2642	2415	2199

Cartridge	Bullet weight	Muzzle velocity	Muzzle energy
.240 Weatherby Magnum	100 gr	3406 ft/s	2576 ft·lbf
[.240 Apex](240-apex)	100 gr	2900 ft/s	1865 ft·lbf
[.242 Rimless Nitro Express](242-rimless-nitro-express)	100 gr	2800 ft/s	1740 ft·lbf
[.243 Winchester](243-winchester)	100 gr	2960 ft/s	1945 ft·lbf
[.243 Winchester Super Short Magnum](243-winchester-super-short-magnum)	100 gr	3110 ft/s	2147 ft·lbf
[.244 H&H Magnum](244-h-h-magnum)	100 gr	3500 ft/s	2720 ft·lbf
[.246 Purdey](246-purdey)	100 gr	2950 ft/s	1930 ft·lbf
[6 mm Lee Navy](6-mm-lee-navy)	100 gr	2680 ft/s	1595 ft·lbf
[6 mm Remington](6-mm-remington)	100 gr	3100 ft/s	2133 ft·lbf

References

Cartridge Dimensions at Steves Pages
[mm)/240%20Weatherby%20Magnum%20page%20209.pdf .240 Wby data](http://www.accuratepowder.com/data/PerCaliber2Guide/Rifle/Standarddata(Rifle)/243Cal(6.17) at Accurate Powder

References

"Hodgdon Online Reloading Data".
[http://www.chuckhawks.com/240weatherby.htm The .240 Weatherby Magnum by Chuck Hawks]
[http://www.chuckhawks.com/subscribers/rifle_cartridge_page/240weatherby.htm The .240 Weatherby Magnum by Chuck Hawks (subscription required)]
[http://www.chuckhawks.com/subscribers/rifle_cartridge_page/compared_243WSSM_240.htm Compared: The .243 WSSM and .240 Wby. Mag. by Chuck Hawks (subscription required)]
"SBST243SS". Olin Corporation 190 Carondelet Suite 1530 Clayton, MO 63105.
"Western Powders".

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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