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257 Weatherby Magnum / History:
Centerfire Rifle Cartridges
Written by: Kim Lockhart, Copyright.

257 Weatherby Magnum:
 The 257 Weatherby Magnum was introduced to the public in the mid 1940's by Roy Weatherby as one of his original cartridges and his personal favorite as well. The 257 Weatherby Magnum cartridge case itself is the 300 H&H magnum case necked down to 25 caliber and blown out the full length of the case which then sports a double radius shoulder and shortened to 2.545" with a long neck.

 The 257 Weatherby Magnum is a extremely flat shooting dual purpose cartridge and is the fastest of all commercially available 25 caliber cartridges, sending a 80 grain bullet out the muzzle at 3,870 feet per second for varmints and able to send a 115 grain bullet out the muzzle at 3,400 feet per second for deer sized game.

 The 257 Weatherby Magnum with the power it offers down range will also recoil somewhat to the shooters shoulder but is still manageable to shoot. The 257 Weatherby Magnum definitely needs a 26" barrel length for a more complete powder burn as the muzzle blast and flash are fairly high for any barrel length shorter.

 To achieve maximum accuracy from your 257 Weatherby Magnum 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.


257 Weatherby Magnum / Hunting Applications:

 These are down range trajectory charts for the 257 Weatherby Magnum 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:
257 Wby. Mag. rifle cartridge manufacturer: Weatherby.
Bullet weight: 87 Grains.
Bullet ballistic coefficient: .322.
Bullet muzzle velocity: 3,825 Feet Per Second.
Bullet muzzle energy: 2,826 Foot Pounds.
Bullet trajectory is set at 1 inch mid-range rise.
Rifle true zero is 217 Yards.
Maximum point blank range is 248 yards.
87 Grain Bullet
Down Range
At 100
Yards
At 200
Yards
At 300
Yards
At 400
Yards
At 500
Yards
Trajectory in Inches: + 0.8 + 0.4 - 3.5 - 11.6 - 25.1
Energy in Foot Pounds: 2,328 1,913 1,565 1,271 1,022
Predator Effectiveness: + + + + +
Good Deer Hunting Load:
257 Wby. Mag. rifle cartridge manufacturer: Weatherby.
Bullet weight: 115 Grains.
Bullet ballistic coefficient: .453.
Bullet muzzle velocity: 3,400 Feet Per Second.
Bullet muzzle energy: 2,952 Foot Pounds.
Bullet trajectory is set at 2 inch mid-range rise.
Rifle true zero is 247 Yards.
Maximum point blank range is 285 yards.
115 Grain Bullet
Down Range
At 100
Yards
At 200
Yards
At 300
Yards
At 400
Yards
At 500
Yards
Trajectory in Inches: + 1.5 + 1.4 - 2.7 - 11.4 - 25.6
Energy in Foot Pounds: 2,566 2,227 1,926 1,659 1,422
Deer Effectiveness + + + + +

257 Weatherby Magnum / Specifications:
Rifle:
Barrel Length - 26".
Bore Twist Rate Early - 1 in 12" / Current - 1 in 10".
Bore Groove Diameter - .257".
Cartridge:
Bullet Diameter - .257".
Primer Size - Large Rifle.
Primer Type - Magnum.
Case Neck Diameter - .283".
Case Shoulder Diameter - .492".
Case Base Diameter - .512".
Case Rim Diameter - .531".
Trimmed Case Length - 2.540".
Maximum Case Length - 2.550".
Maximum Overall Length - 3.250".
257 Wby. Mag.
Rifle Cartridge
Manufacturer
Bullet
Weight
Grains
Bullet
Ballistic
Coefficient
Muzzle
Velocity
Fps.
Muzzle
Energy
Ft. lbs.
Recoil
Energy
Ft. lbs.
Weatherby 80 .378 3,870 2,660 14.79
Weatherby 87 .322 3,825 2,826 15.90
Weatherby 100 .357 3,602 2,881 17.14
Weatherby 110 .418 3,460 2,924 18.05
Weatherby 115 .453 3,400 2,952 18.47
Weatherby 117 .243 3,402 3,007 18.71
Weatherby 120 .391 3,305 2,910 18.50

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

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