Winchester Magnum

The .256 Winchester Magnum was introduced in 1960 as a new handgun cartridge with no guns made for it. Soon after, however, the single-shot Ruger Hawkeye pistol was introduced. The anticipated Smith & Wesson and Ruger revolvers chambered for this cartridge never materialized due to technical problems associated with setback of the bottle-necked case when the cartridge is fired in a revolver.

The .256 Winchester Magnum is also listed as a rifle cartridge because Marlin produced the Model 62 lever action rifle in this chambering. The Thompson/Center Contender was also chambered for this round.

As a rifle cartridge, the .256 Winchester Magnum is somewhat more potent than the .25-20 and is considered an effective varmint cartridge out to about 150 yards.

The SAAMI Maximum Average Pressure for the .256 Winchester is 43,000 C.U.P.

.256 WINCHESTER MAGNUM

Gun

DOUGLAS

Max Length

1.281 "

Barrel Length

24"

Trim Length

1.261"

Primer

CCI 500

OAL Max

1.590"

Case

WW

OAL Min

1.540"

START LOADS

MAXIMUM LOADS

Cartridge

Bullet

Powder

Grains

Vel.

Powder

Grains

Vel.

C.U.P.

Length

Comment

65 (L) FNGC

1680

13.5

2034

1680

15.0

2311

29,300

1.585"

LY257420

2015

16.2

1952

2015

18.0

2218

27,000

HDY 60 FN

1680

16.2

2423

1680

18.0

2753

40,900

1.580"

2015

18.0

2138

2015

20.0

2430

30,600

Compressed

SPR 75 FN

1680

14.9

2120

1680

16.5

2409

37,400

1.575"

2015

18.0

2133

2015

20.0

2424

36,100

Compressed

.440 11,18mm

.381

9,68mm

9,35mm 7,24mm

.208

.257 6,53mm

9,35mm 7,24mm

.208

5,28mm

.257 6,53mm

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