.50 Alaskan
Left to Right (line by line)
.44 Magnum, .445 Super Magnum, .45 Colt, .454 Casull,
.480 Ruger, .475 Maximum, .50 Action Express, .500 Linebaugh, .500 Maximum, .500 S&W Magnum, .50 Beowulf, .50 Alaskan
Type Rifle, Large game
Place of origin 22x20px United States
Production history
Designer Harold Johnson
Designed 1950s
Parent case .348 Winchester
Case type Rimmed
Bullet diameter .510 in (Bad rounding hereScript error mm)
Neck diameter .536 in (Bad rounding hereScript error mm)
Base diameter .553 in (Bad rounding hereScript error mm)
Rim diameter .610 in (Bad rounding hereScript error mm)
Rim thickness .070 in (Bad rounding hereScript error mm)
Case length 2.10 in (Bad rounding hereScript error mm)
Ballistic performance
Bullet weight/type Velocity Energy
450 gr (Bad rounding hereScript error g) BAR FP1,718 ft/s (Bad rounding hereScript error m/s)2,950 ft·lbf (Bad rounding hereScript error J)
500 gr (Bad rounding hereScript error g) JFP1,674 ft/s (Bad rounding hereScript error m/s)3,112 ft·lbf (Bad rounding hereScript error J)
525 gr (Bad rounding hereScript error g) LFN GC1,694 ft/s (Bad rounding hereScript error m/s)3,346 ft·lbf (Bad rounding hereScript error J)
Source(s): Hodgdon[1]

The .50 Alaskan is a wildcat cartridge developed by Harold Johnson and Harold Fuller of the Kenai Peninsula of Alaska in the 1950s. Johnson based the cartridge on the .348 Winchester in order to create a rifle capable of handling the large bears in Alaska.


Harold Johnson necked out the .348 Winchester case to accept a .510" diameter bullet,[2] and Harold Fuller developed the barrel, marrying a .50 caliber barrel to an old Winchester Model 1886 rifle.

Since the rifle was designed for use on Alaska’s great bears, Johnson cut 720-grain (Bad rounding hereScript error g) boat-tail .50 BMG bullets in half, seating the 450-grain (Bad rounding hereScript error g) rear half upside down in the fireformed .50-caliber case. It didn’t take Johnson long to find out that the 450-grain truncated shaped “solid” would shoot through a big brown bear from any direction, claiming in 1988, “I never recovered a slug from a bear or moose, no matter what angle the animal was shot at.”Script error[citation needed]


Harold’s favorite load in the .50 Alaskan was 51.5 grains (Bad rounding hereScript error g) of IMR-4198 with a Barnes 400-grain (Bad rounding hereScript error g) flatnose, jacketed bullet for about 2,100 ft/s (Bad rounding hereScript error m/s) and just under 4,000 ft·lbf (Bad rounding hereScript error J)of muzzle energy.Script error[citation needed].

The Alaskan is shorter than the .510 Kodiak Express and produces about 10% less energy.[3]


Rifles for .50 BMF Bullet are available from some specialty gunsmiths and also conversions from Marlin and Winchester lever-action rifles.[4][5][6] Reloading dies are available from Hornady.[7] Although it is considered a wildcat cartridge, loaded ammunition is available from Buffalo Bore.[8][9]

See alsoEdit


  1. The .50 Alaskan Built on a Marlin Levergun by Al Anderson
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