| .270 Weatherby Magnum | ||
|---|---|---|
| File:Munit03.jpg .270 Weatherby 2nd from left | ||
| Type | Rifle / Hunting | |
| Place of origin | USA | |
| Production history | ||
| Designer | Roy Weatherby | |
| Designed | 1943 | |
| Manufacturer | Weatherby | |
| Specifications | ||
| Parent case | .300 H&H Magnum | |
| Case type | Belted, bottleneck | |
| Bullet diameter | .277 in (Script error: No such module "Math". mm) | |
| Neck diameter | .303 in (Script error: No such module "Math". mm) | |
| Shoulder diameter | .492 in (Script error: No such module "Math". mm) | |
| Base diameter | .512 in (Script error: No such module "Math". mm) | |
| Rim diameter | .531 in (Script error: No such module "Math". mm) | |
| Rim thickness | .220 in (Script error: No such module "Math". mm) | |
| Case length | 2.55 in (Script error: No such module "Math". mm) | |
| Overall length | 3.25 in (Script error: No such module "Math". mm) | |
| Rifling twist | 1-10" | |
| Primer type | Large rifle magnum | |
| Ballistic performance | ||
| Bullet weight/type | Velocity | Energy |
| 110 gr (Script error: No such module "Math". g) HP | 3,528 ft/s (Script error: No such module "Math". m/s) | 3,041 ft·lbf (Script error: No such module "Math". J) |
| 130 gr (Script error: No such module "Math". g) X | 3,338 ft/s (Script error: No such module "Math". m/s) | 3,217 ft·lbf (Script error: No such module "Math". J) |
| 140 gr (Script error: No such module "Math". g) BT | 3,242 ft/s (Script error: No such module "Math". m/s) | 3,268 ft·lbf (Script error: No such module "Math". J) |
| 150 gr (Script error: No such module "Math". g) SBT | 3,161 ft/s (Script error: No such module "Math". m/s) | 3,329 ft·lbf (Script error: No such module "Math". J) |
| Test barrel length: 26" Source(s): Accurate Powder [1] | ||
The .270 Weatherby Magnum was the first belted magnum based on the .300 H&H Magnum to be developed by Roy Weatherby. It has the characteristic double-radius shoulders and is necked down to accommodate the .277in bullets. Being a proprietary cartridge, the .270 Weatherby has no official SAAMI maximum pressure limit. Weatherby factory ammunition is loaded to 71,000 PSI.[1] The first Weatherby cartridge to be used in Africa was the .270 Weatherby on a jackal on June 8, 1948.[2]
Performance[]
Given its higher pressure and larger case which holds more powder than the .270 Winchester, the .270 Weatherby has about 200 ft/s faster performance with any particular bullet weight. This performance comes at the cost of more recoil and barrel heat. In addition, a long barrel is necessary to take advantage of extra powder to gain maximum velocity. The cartridge is excellent at long-range hunting, but is not well suited to high-volume shooting such as varmint hunting.[3]
For those handloading their own cartridges, this is an easy round to load. It does best with full-power loads and is not well-suited for reduced loads.[3][4] Ed Weatherby, son of Roy Weatherby says that the .270 Weatherby is his favorite caliber. As he puts it, there just isn't a better long-range deer caliber. He goes on to mention that it is also quite effective for elk, and pronghorn.[2]
.308 Winchester (left) .270 Weatherby Magnum (center) .223 Remington (Right)
See also[]
References[]
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