| .240 Magnum Rimless |
|---|
| Type |
Rifle |
|---|
| Place of origin |
England |
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| Production history |
|---|
| Designer |
Holland & Holland |
|---|
| Designed |
1920 |
|---|
| Manufacturer |
Holland & Holland |
|---|
| Specifications |
|---|
| Case type |
Belted rimless |
|---|
| Bullet diameter |
.245 in (6.2 mm) |
|---|
| Neck diameter |
.274 in (7.0 mm) |
|---|
| Shoulder diameter |
.403 in (10.2 mm) |
|---|
| Base diameter |
.450 in (11.4 mm) |
|---|
| Rim diameter |
.467 in (11.9 mm) |
|---|
| Rim thickness |
.035 in (0.89 mm) |
|---|
| Case length |
2.49 in (63 mm) |
|---|
| Overall length |
3.21 in (82 mm) |
|---|
| Primer type |
Kynoch # 81 |
|---|
| Ballistic performance |
|---|
| Bullet mass/type |
Velocity |
Energy |
| 100 gr (6 g) SP |
2,900 ft/s (880 m/s) |
1,865 ft⋅lbf (2,529 J) |
|
|
Source(s): Cartridges of the World.[1] |
| .240 Magnum Flanged |
|---|
| Specifications |
|---|
| Case type |
Rimmed |
|---|
| Bullet diameter |
.245 in (6.2 mm) |
|---|
| Neck diameter |
.274 in (7.0 mm) |
|---|
| Shoulder diameter |
.402 in (10.2 mm) |
|---|
| Base diameter |
.448 in (11.4 mm) |
|---|
| Rim diameter |
.513 in (13.0 mm) |
|---|
| Rim thickness |
UNK |
|---|
| Case length |
2.5 in (64 mm) |
|---|
| Overall length |
3.25 in (83 mm) |
|---|
| Primer type |
Kynoch # 81 |
|---|
| Ballistic performance |
|---|
| Bullet mass/type |
Velocity |
Energy |
| 100 gr (6 g) SN |
2,775 ft/s (846 m/s) |
1,711 ft⋅lbf (2,320 J) |
|
Test barrel length: 28
Source(s): Kynoch Ammunition.[2] |
The .240 Magnum Rimless Holland & Holland (also known as the .240 Apex and the .240 Super Express) and the .240 Magnum Flanged are a pair of centrefire sporting rifle cartridges developed in English gunmakers Holland & Holland in the 1920s, primarily for use in hunting deer and plains game.[1]
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.[3]
Most bolt-action rifles made for the .240 H&H will be amply strong enough to handle handloaded cartridges at high pressure.
.240 H&H Performance Comparison
| Cartridge | Bullet weight | Muzzle velocity | Muzzle energy |
|---|
| .240 H&H Magnum | 100 gr (6.5 g) | 2,900 ft/s (880 m/s) | 1,865 ft⋅lbf (2,529 J) |
| .240 Weatherby Magnum | 100 gr (6.5 g) | 3,406 ft/s (1,038 m/s) | 2,576 ft⋅lbf (3,493 J) |
| .243 Winchester | 100 gr (6.5 g) | 2,960 ft/s (900 m/s) | 1,945 ft⋅lbf (2,637 J) |
| .243 Winchester Super Short Magnum | 100 gr (6.5 g) | 3,110 ft/s (950 m/s) | 2,147 ft⋅lbf (2,911 J) |
| .244 H&H Magnum | 100 gr (6.5 g) | 3,500 ft/s (1,100 m/s) | 2,720 ft⋅lbf (3,690 J) |
| 6 mm Remington | 100 gr (6.5 g) | 3,100 ft/s (940 m/s) | 2,133 ft⋅lbf (2,892 J) |
References
- 1 2 Barnes, Frank C., Cartridges of the World, 15th ed, Gun Digest Books, Iola, 2016,
ISBN 978-1-4402-4642-5.
- ↑ Kynoch Ammunition, "Big Game Cartridges", www.kynochammunition.co.uk, archived, 15 August 2016.
- ↑ "The .240 Apex" by Chuck Hawks