.244 H&H Magnum

Infobox Firearm Cartridge
name= .244 H&H Magnum


caption=
origin=flagcountry|United Kingdom
type= Rifle
service=
used_by=
wars=
designer= David Lloyd
design_date=1955
manufacturer=Holland & Holland
production_date=1955
number=
variants=
is_SI_specs=
parent= .375 H&H Magnum
case_type=Belted, rimless
bullet=.244
neck=.263
shoulder=.445
base=.508
rim_dia=.532
rim_thick=
case_length=2.78
length=3.58
rifling=
primer=
is_SI_ballistics=
bw1=100
btype1=SP
vel1=3500
en1=2720
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vel2=
en2=
bw3=
btype3=
vel3=
en3=
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balsrc= Cartridges of the World "Cartridges of the World 11th Edition", Book by Frank C. Barnes, Edited by Stan Skinner, Gun Digest Books, 2006, ISBN 0-89689-297-2 pp. 380, 532] The .244 Holland & Holland Magnum cartridge was created in 1955 in Great Britain by deerstalker and rifle-maker David Lloyd (d. 1996), of Pipewell Hall, Northamptonshire and Glencassley in Sutherland, Scotland, and is not to be confused with the smaller-cased and much milder 6 mm (.244 in) Remington. Stalking on extremely steep deer forests such as his own at Glencassley, Lloyd was in search of a "canyon rifle" cartridge that would shoot exceptionally fast and with a very flat trajectory across deep valleys and over distances out to convert|300|yd and more, to make range estimation less critical for accurate bullet placement, and to deliver a hard-hitting bullet weighing a minimum of convert|100|gr|-1. The .244 H&H Magnum easily met these criteria.

History

Based upon the well proven .375 H&H Magnum rimless belted big game cartridge case heavily necked down, the .244 H&H originally fired a convert|100|gr|adj=on, aluminum-jacketed, copper-pointed bullet pushed by convert|74|gr|1 of non-cordite smokeless (nitrocellulose) powder, and returned a muzzle velocity of about convert|3500|ft/s. That load and velocity remain standard for the commercially-loaded cartridge today; although handloaders can achieve higher velocities with careful load tuning. The .244 seldom performs well in barrels less than convert|26|in long, owing to the need for a longer bore to allow pressure and bullet velocity to reach intended levels.

Lloyd was unable and unwilling to embark upon commercial cartridge production, and consequently "gave" the cartridge to veteran London rifle and ammunition makers Holland and Holland Ltd., who in 1954 had paid him £250 towards his cartridge development costs. H&H quickly adopted it, the cartridge acquired the prestigious "H&H" appellation, and both H&H and David Lloyd went on to build significant numbers of very high-quality bolt-action deer-stalking rifles in .244 H&H Magnum calibre (see Lloyd rifle). Initially, commercially-loaded ammunition was manufactured by IMI Kynoch at its Birmingham, England factory. Commercially, this cartridge has only ever been loaded with convert|100|gr|adj=on bullets: lighter- and heavier-bulleted loads have been created by handloaders.

Chuck Hawks, a prominent US commentator on rifle cartridges, opines that, "the .244 H&H Magnum represents some sort of high water mark in the development of the 6 mm cartridge. To use an aviation analogy, you could think of it as the Concorde of rifle cartridges." [ [http://www.chuckhawks.com/244H-H_Mag.htm .244 H&H Magnum by Chuck Hawks] ]

David Lloyd, the .244's originator, went on to develop a still more powerful prototype round by reducing the case body taper and increasing the already large power capacity to produce the "David Lloyd 6 mm Magnum". His hope was to use bullets heavier than the .244 H&H standard convert|100|gr|sing=on; but this cartridge was never commercially produced, and only two prototype Lloyd rifles are believed to have been chambered for it.

In the early 1990s British fieldsports author and ballistician Colin McKelvie had a custom rifle built on a BRNO CZ Magnum action, with a .244in Border Barrel with a 1:7 fast twist. Using handloads with very-low-drag (VLD) .244in hollow-point bullets of convert|115|gr|1, accuracy of 0.63 MOA was achieved, with average muzzle velocity of 3,630 ft/s (1,106 m/s) and acceptable chamber pressures.fact|date=July 2007 This level of performance is what Lloyd had sought with his "improved" .244 H&H Magnum.

Controversy

While the belted .244 H&H Magnum could be considered the velocity/energy pinnacle of 6 mm/.240in cartridges, that power comes at the cost of significant muzzle blast, as well as shorter-than-average barrel life; in addition to which commercially-loaded ammunition is expensive. Because of these drawbacks the cartridge never came into widespread popularity, and has never been offered as a chambering by any of the mass-market riflemakers. The .244 H&H rather fell by the wayside in favour of 6 mm rifles in the same general class such as the .240 Weatherby Magnum (for which it had been an inspiration to designer Roy Weatherby), and also the various 6.5 mm Magnums. The .244 H&H still has its adherents, however, and occasional rifles are still chambered in this caliber, by Holland & Holland and others. Ammunition is still made for Holland & Holland, and used cases can of course be handloaded.

Such extremely high velocity calibres always invite controversy, and the .244 H&H has been passionately condemned (invariably by commentators with little practical experience of it) as a result of some reports of rifles blowing-up or seriously malfunctioning as a result of massively excessive chamber and bore pressures. A few such incidents have occurred; but the fault in all cases has been found to lie with the rifles' owners' failure to keep the bores scrupulously free of accumulated copper fouling.Fact|date=July 2007 The very fast, rapidly spinning .244 bullet tends to deposit bullet gilding metal fouling rather readily, especially in a roughly bored barrel, and as this deposition builds up the bore becomes constricted and internal pressures rise exponentially, sometimes to and beyond danger point. Accurate and safe shooting with the .244 H&H - an extreme cartridge - has always been predicated upon meticulous bore cleaning, which is essential. Where this has been done, no rifle has failed to perform well and safely. Fact|date=July 2007

pecifications

Despite the .244 designation, the .244 H&H Magnum actually uses a bullet of .245in diameter, similar to its older, much milder H&H predecessor, the .240 Apex; and this has been a source of some confusion, and of frustration to handloaders. Most typical 6 mm caliber cartridges use a .243 bullet. While there is a wealth of market choice for the handloader seeking good .243in diameter hunting bullets, such as are used in the .243 Winchester, the .245in bullet is only made in one convert|100|gr|sing=on type, exclusively for the commercial manufacturers of this cartridge. Attempts to use conventional .243in bullets in a H&H or Lloyd barrel bored for .245 have been disappointing, with indifferent accuracy. However, a few enthusiasts have achieved very good results with custom-made rifles, using .244 H&H chamber reamers on barrels bored to .243in., using standard .243in bullets.
*Bullet diameter: .245 in
*Rim diameter: .532 in
*Loads:
**55 gr @ 4,034 ft/s (1,229.6 m/s)
**95 gr @ 3,522 ft/s (1,073.5 m/s)
**100 gr @ 3,500 ft/s (1,070 m/s)

References

* [http://www.reloadersnest.com/query_bl.asp?CaliberID=106&Bullet=Nosler%20Ballistic%20Tip .244 H&H Loading data at Reloaders Nest]

External links

* [http://www.accuratereloading.com/244hhmag.html 244 HOLLAND & HOLLAND MAGNUM] at Accurate Reloading