- Source: .240 Apex
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-grain (6.5 g) bullet with a diameter of .245 inches (contrary to the .240 name) giving a muzzle velocity of approximately 2,900 feet per second (880 m/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.
See also
List of rifle cartridges
6 mm caliber
References
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