.240 Apex

.240 Apex

Infobox Firearm Cartridge
name= .240 Apex


caption=
origin= England
type= Rifle
service=
used_by=
wars=
designer= Holland & Holland
design_date=1920
manufacturer=Holland & Holland
production_date=
number=
variants= .240 Flanged
is_SI_specs=
parent=
case_type=Rimless, Rimmed
bullet=.245
neck=.274
shoulder=.403
base=.450
rim_dia=.467
rim_thick=.035
case_length=2.49
length=3.21
rifling=
primer=Berdan
is_SI_ballistics=
bw1=100
btype1=SP
vel1=2900
en1=1865
bw2=
btype2=
vel2=
en2=
bw3=
btype3=
vel3=
en3=
bw4=
btype4=
vel4=
en4=
bw5=
btype5=
vel5=
en5=
test_barrel_length=
balsrc= "Cartridges of the World" cite book
last = Barnes
first = Frank C.
editor = Skinner, Stan
title = Cartridges of the World
edition = 11th Edition
origyear = 1965
year = 2006
publisher = Gun Digest Books
location = Iola, WI, USA
pages =380,408,410
isbn = 0-89689-297-2] The .240 Apex (also known as the .240 Belted Nitro Express and the .240 Magnum Rimless) is a centrefire sporting rifle cartridge developed in England in the 1920s, primarily for use in hunting deer and plains game. This round has always been particularly closely associated with the firm of Holland and Holland, rifle and gun makers of London, England, which has built more magazine and double rifles in this calibre than anyone else. A rimmed variant of this cartridge, known as the .240 Magnum Flanged, was developed for use in double rifles.

Overview

A number of Lloyd rifles were made in the period 1930 - 1950 for the .240 Apex cartridge, and David Lloyd took it as the starting point in his development of his .244 H&H Magnum cartridge, which uses the same distinctive .245in diameter bullet, but fired from a very much larger case." [http://www.chuckhawks.com/240Apex.htm The .240 Apex] " by Chuck Hawks]

The ballistic performance of the .240 Apex in factory loads is very similar to that of the .243 Winchester, with a convert|100|gr|g|sing=on bullet giving a muzzle velocity of approximately convert|2900|ft/s|m/s. When it is loaded at the same pressure as the .243 WSSM using modern powders, the .240 Apex has the potential for slightly better performance.

The case dimensions of the .240 are not unlike those of the "wildcat" 6mm-06 (the .30-'06 cartridge case necked down to accept a 6mm/.244 bullet), but the .240 case has a slightly smaller diameter, and the case is distinctive in appearance owing to its long neck.

Most bolt-action rifles made for the .240 Apex will be amply strong enough to handle handloaded cartridges at high pressure. However, caution is required in reloading the rimmed version of the .240 - the Magnum Flanged cartridge - for older double rifles, which in any event will have had their sights set for the zero to which the original load shot.

ee also

* List of rifle cartridges
* 6 mm caliber

References


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