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243 WSSM / History:
Centerfire Rifle Cartridges
Written by: Kim Lockhart, Copyright.

243 Winchester Super Short Magnum:
The 243 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 2003. The 243 WSSM is a commercial cartridge based on the 404 jeffery cartridge case, shortening and necking down to .243" caliber and sharpening the shoulder angle to 28 degrees the new 243 WSSM cartridge has more than ample case capacity for its dual purpose use. The 243 WSSM cartridge achieves superior dual purpose performance at the factory level, providing varmint and deer hunters with a high level of .243" caliber performance. The 243 WSSM cartridge is the first dual purpose cartridge where you do not have to handload to cater your liking of this cartridge for varmint or deer, the factory offerings are good and work accurately.

 The 243 WSSM factory loadings show a velocity of 4,060 feet per second for a 55 grain bullet for varminting and this alone is an astounding velocity for any .243" caliber cartridge, thus making the bullet energy of this cartridge an easy 500 yard varminter. The 243 WSSM factory loadings show a velocity of 3,250 feet per second for a 95 grain bullet for medium sized deer hunting, thus making the bullet energy of this cartridge an easy 350 yard medium sized deer cartridge. For any deer hunter wanting a 1 rifle set-up for long range varminting and deer hunting, the 243 WSSM cartridge is highly recommended as it offers excellent down range trajectories with plenty of bullet energy for very effective distant kills.

 To achieve maximum accuracy from your 243 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.


243 WSSM / Hunting Applications:

 These are down range trajectory charts for the 243 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:
243 WSSM rifle cartridge manufacturer: Winchester.
Bullet weight: 55 Grains.
Bullet ballistic coefficient: .276.
Bullet muzzle velocity: 4,060 Feet Per Second.
Bullet muzzle energy: 2,013 Foot Pounds.
Bullet trajectory is set at 1 inch mid-range rise.
Rifle true zero is 225 Yards.
Maximum point blank range is 260 yards.
58 Grain Bullet
Down Range
At 100
Yards
At 200
Yards
At 300
Yards
At 400
Yards
At 500
Yards
Trajectory in Inches: + 0.7 + 0.5 - 3.0 - 10.7 - 23.8
Energy in Foot Pounds: 1,607 1,280 1,014 795 616
Predator Effectiveness: + + + + +
Good Deer Hunting Load:
243 WSSM rifle cartridge manufacturer: Winchester.
Bullet weight: 95 Grains.
Bullet ballistic coefficient: .400.
Bullet muzzle velocity: 3,250 Feet Per Second.
Bullet muzzle energy: 2,238 Foot Pounds.
Bullet trajectory is set at 2 inch mid-range rise.
Rifle true zero is 238 Yards.
Maximum point blank range is 280 yards.
95 Grain Bullet
Down Range
At 100
Yards
At 200
Yards
At 300
Yards
At 400
Yards
At 500
Yards
Trajectory in Inches: + 1.7 + 1.3 - 3.6 - 14.0 - 30.8
Energy in Foot Pounds: 1,898 1,611 1,361 1,142 952
Deer Effectiveness + + + - -

243 WSSM / Specifications:
Rifle:
Barrel Length - 24".
Bore Twist Rate - 1 in 10".
Bore Groove Diameter - .243".
Cartridge:
Bullet Diameter - .243".
Primer Size - Large Rifle.
Primer Type - Standard.
Case Neck Diameter - .291".
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".
243 WSSM
Rifle Cartridge
Manufacturer
Bullet
Weight
Grains
Bullet
Ballistic
Coefficient
Muzzle
Velocity
Fps.
Muzzle
Energy
Ft. lbs.
Recoil
Energy
Ft. lbs.
Winchester 55 .276 4,060 2,013 7.50
Winchester 95 .400 3,250 2,228 9.70
Winchester 95 .411 3,150 2,093 9.40
Winchester 100 .356 3,110 2,148 9.60

.24" Caliber
243 Win.
6mm Rem.
243 WSSM
240 Wby. Mag.

Short Magnums

243 WSSM / History / Hunting / Specifications.
.17 HM2, .17 HMR, .17 WSM, 5mm Rem. Mag., .22 BB Cap, .22 CB Cap, .22 Short, .22 Long, .22 LR, .22 WRF, .22 WMR.
17 Rem., 204 Ruger, 22 Hornet, 222 Rem., 223 Rem., 22-250 Rem., 220 Swift, 223 WSSM, 243 Win., 6mm Rem., 243 WSSM,
240 Wby. Mag., 250 Sav., 257 Roberts, 25 WSSM, 25-06 Rem., 257 Wby. Mag., 6.5 x 55mm Swedish Mauser, 260 Rem.,
6.5mm Rem. Mag., 264 Win. Mag., 6.8 Rem., 270 Win., 270 WSM, 270 Wby. Mag., 280 Rem., 7mm Rem. Mag., 7mm WSM,
30-30 Win., 308 Win., 30-06 Sprg., 300 Win. Mag., 300 WSM, 300 Wby. Mag., 325 WSM, 338 Win. Mag., 340 Wby. Mag.,
357 Mag., 44 Rem. Mag., 444 Marlin, 45-70 Government.