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.240 Apex

UK sporting rifle cartridge

Field	Value
name	.240 Magnum Rimless
origin	England
type	Rifle
designer	Holland & Holland
design_date	1919
manufacturer	Holland & Holland
case_type	Belted, bottleneck
bullet	.245
neck	.274
shoulder	.403
base	.450
rim_dia	.467
rim_thick	.035
case_length	2.49
length	3.21
primer	Kynoch # 81
bw1	100
btype1	SP
vel1	2900
en1	1865
balsrc	Cartridges of the World.

The .240 Magnum Rimless Holland & Holland (also known as the .240 Apex and the .240 Super Express) is a centrefire sporting rifle cartridge developed in English gunmakers Holland & Holland no later than 1919, primarily for use in hunting deer and plains game.

As it was common for rimless hunting cartridges, a rimmed (beltless) variant, at the time called just "Holland's 240 Super Express" and now sometimes named .240 Flanged Magnum or .240 H&H Flanged, was developed simultaneously for break-barrel rifles and combination guns.

Overview

The ballistic performance of the .240 H&H in factory loads is very similar to that of the .243 Winchester, with a 100 gr bullet with a diameter of .245 inches (contrary to the .240 name) giving a muzzle velocity of approximately 2900 ft/s. When it is loaded at the same pressure as the .243 WSSM using modern powders, the .240 H&H has the potential for slightly better performance.

Most bolt-action rifles made for the .240 H&H will be amply strong enough to handle hand-loaded cartridges at high pressure.

Cartridge	Bullet weight	Muzzle velocity	Muzzle energy
.240 H&H Magnum	100 gr	2900 ft/s	1865 ft·lbf
.240 Weatherby Magnum	100 gr	3406 ft/s	2576 ft·lbf
.242 Rimless Nitro Express	100 gr	2800 ft/s	1740 ft·lbf
.243 Winchester	100 gr	2960 ft/s	1945 ft·lbf
.243 Winchester Super Short Magnum	100 gr	3110 ft/s	2147 ft·lbf
.244 H&H Magnum	100 gr	3500 ft/s	2720 ft·lbf
.246 Purdey	100 gr	2950 ft/s	1930 ft·lbf
6 mm Lee Navy	100 gr	2680 ft/s	1595 ft·lbf
6 mm Remington	100 gr	3100 ft/s	2133 ft·lbf

References

Barnes, Frank C., ''Cartridges of the World'', 15th ed, Gun Digest Books, Iola, 2016, {{ISBN. 978-1-4402-4642-5.
[http://www.kynochammunition.co.uk/cartridge%20collection.html Kynoch Ammunition, "Big Game Cartridges", ''www.kynochammunition.co.uk''], [https://web.archive.org/web/20150527033406/http://www.kynochammunition.co.uk/cartridge%20collection.html archived], 15 August 2016.
"Holland & Hollands "Apex" .240 super express rifle".
[https://dspace.nplg.gov.ge/handle/1234/84132 H&H 1933 catalog]
"240 FLANGED MAGNUM | Cartridgecollector.net".

Info: Wikipedia Source

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