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25 WSSM / History:
Centerfire Rifle Cartridges - Short Magnums
Written by: Kim Lockhart, Copyright.

25 Winchester Super Short Magnum:
The 25 WSSM is a new centerfire rifle cartridge developed in partnership with Browning Arms Company and Winchester ammunition, making its debut and introduced to the shooting public in 2004. The 25 WSSM is a commercial cartridge based on the 404 jeffery cartridge case, shortening and necking down to .257" caliber and sharpening the shoulder angle to 30 degrees the new 25 WSSM cartridge has more than enough case capacity for its intended dual purpose use.
 The 25 WSSM cartridge achieves its useful purpose as a very flat shooting varmint cartridge and as an excellent deer cartridge, 25 caliber is a time proven caliber for deer size animals. The 25 WSSM factory loadings show a velocity of 3,470 feet per second for a 85 grain varmint round and 3,100 feet per second for a 110 grain bullet for deer hunting and this translates to very low recoil for the shooter with plenty of bullet energy at the 700 yard mark for varmints and predators and the 400 yard mark to harvest any white-tailed deer size animal.

 The 25 WSSM cartridge is a well thought out cartridge as Winchester is no stranger in 25 caliber cartridge development. Winchester has developed 4 cartridges in this caliber over a 111 year time span; (25-20 in 1893), (25-35 in 1895), (256 Winchester Magnum in 1960) and (25 Winchester Super Short Magnum in 2004). The 25 WSSM cartridge, chambered in a super short actioned light weight rifle may well be the ultimate combination for the 1 gun hunter of strictly varmints, predators and white-tailed deer size game.

 To achieve maximum accuracy from your 25 WSSM rifle there are several things you need to do correctly that will help increase your rifles overall accuracy capabilities.
First: Properly mount your riflescope.
Second: Properly break-in your rifle barrel.
Third: Properly sight-in your rifle.
Fourth: Properly clean your rifles bore.
 To accurately calculate ballistics for your rifle with ballistics programs you need to measure your rifles scope mounted height.


25 WSSM / Hunting Applications:

 These are down range trajectory charts for the 25 WSSM cartridge with the scope mounted 1.8 inches above the bore center line plus if you were using these loads, their effective hunting bullet energy range with well placed shots on;
Predators: Such As, Bobcat, Cougar And Coyote.
Deer Size Game: Such As, Antelope, Blacktail Deer, Hogs, Javelina, Mule Deer And Whitetail Deer.
Good Predator Hunting Load:
25 WSSM rifle cartridge manufacturer: Winchester.
Bullet weight: 85 Grains.
Bullet ballistic coefficient: .333.
Bullet muzzle velocity: 3,470 Feet Per Second.
Bullet muzzle energy: 2,272 Foot Pounds.
Bullet trajectory is set at 1 inch mid-range rise.
Rifle true zero is 218 Yards.
Maximum point blank range is 248 yards.
85 Grain Bullet
Down Range
At 100
Yards
At 200
Yards
At 300
Yards
At 400
Yards
At 500
Yards
Trajectory in Inches: + 0.9 0 - 5.1 - 15.4 - 32.2
Energy in Foot Pounds: 1,879 1,548 1,266 1,027 824
Predator Effectiveness: + + + + +
Good Deer Hunting Load:
25 WSSM rifle cartridge manufacturer: Winchester.
Bullet weight: 115 Grains.
Bullet ballistic coefficient: .446.
Bullet muzzle velocity: 3,060 Feet Per Second.
Bullet muzzle energy: 2,392 Foot Pounds.
Bullet trajectory is set at 2 inch mid-range rise.
Rifle true zero is 228 Yards.
Maximum point blank range is 262 yards.
95 Grain Bullet
Down Range
At 100
Yards
At 200
Yards
At 300
Yards
At 400
Yards
At 500
Yards
Trajectory in Inches: + 1.8 + 1.1 - 4.7 - 16.2 - 34.6
Energy in Foot Pounds: 2,066 1,779 1,525 1,300 1,102
Deer Effectiveness + + + + -

25 WSSM / Specifications:
Rifle:
Barrel Length - 24".
Bore Twist Rate - 1 in 10".
Bore Groove Diameter - .257".
Cartridge:
Bullet Diameter - .257".
Primer Size - Large Rifle.
Primer Type - Standard.
Case Neck Diameter - .305".
Case Shoulder Diameter - .544".
Case Base Diameter - .555".
Case Rim Diameter - .535".
Trimmed Case Length - 1.660".
Maximum Case Length - 1.670".
Maximum Overall Length - 2.360".
25 WSSM
Rifle Cartridge
Manufacturer
Bullet
Weight
Grains
Bullet
Ballistic
Coefficient
Muzzle
Velocity
Fps.
Muzzle
Energy
Ft. lbs.
Recoil
Energy
Ft. lbs.
Winchester 85 .333 3,470 2,272 9.60
Winchester 110 .420 3,100 2,347 11.20
Winchester 115 .446 3,060 2,392 11.50
Winchester 120 .344 2,990 2,382 11.70

Rifle Ballistics:
.25" Caliber
250 Savage
257 Roberts
25 WSSM
25-06 Remington
257 Wby. Mag.

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