.270 Weatherby Magnum

Infobox Firearm Cartridge
name= .270 Weatherby Magnum


caption= .270 Weatherby 2nd from left
origin= USA
type= Rifle / Hunting
service=
used_by=
wars=
designer= Roy Weatherby
design_date=1943
manufacturer=Weatherby
production_date=
number=
variants=
is_SI_specs=
parent=.300 H&H Magnum
case_type=Belted, bottleneck
bullet=.277
neck=.303
shoulder=.492
base=.512
rim_dia=.531
rim_thick=.220
case_length=2.55
length=3.25
rifling=1-10"
primer=Large rifle magnum
is_SI_ballistics=
bw1=110
btype1=HP
vel1=3528
en1=3041
bw2=130
btype2=X
vel2=3338
en2=3217
bw3=140
btype3=BT
vel3=3242
en3=3268
bw4=150
btype4=SBT
vel4=3161
en4=3329
bw5=
btype5=
vel5=
en5=
test_barrel_length=26"
balsrc= Accurate Powder [http://www.accuratepowder.com/data/PerCaliber2Guide/Rifle/Standarddata(Rifle)/277Cal(7.03mm)/270%20Weatherby%20Magnum%20page%20237.pdf .270 Weatherby data from Accurate Powder] ] 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. The first Weatherby cartridge to be used in Africa was the .270 Weatherby on a jackal on June 8, 1948. cite book
last = Nosler, Inc.
title = Nosler Reloading Guide
url = www.nosler.com
edition = 5th Edition
year =2002
publisher = Nosler, Inc.
location = Bend, OR, USA
pages =219-224
isbn =
id ]

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.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 = 43
isbn = 0-89689-297-2]

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. cite book
last = Ackley
first = P.O.
title = Handbook for Shooters & Reloaders
edition = 12th Printing
series = vol I
origyear = 1962
year = 1927
publisher = Plaza Publishing
location = Salt Lake City, Utah
pages = 384,385
isbn = 978-9992948811] 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.

ee also

* List of rifle cartridges
* 7 mm caliber

References