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300 Winchester Magnum / History:
Centerfire Rifle Cartridges
Written by: Kim Lockhart, Copyright.

300 Winchester Magnum:
The 300 Winchester Magnum centerfire rifle cartridge is a .30" caliber, belted, bottle neck cartridge case design. This cartridge was developed by Winchester based entirely off of their own 338 Winchester Magnum cartridge by moving the shoulder area of the cartridge forward .156", lengthening the case .120" and necking it down to .308" diameter. Winchester introduced their new 300 Winchester Magnum cartridge to the public in 1963 chambered in their Model 70 bolt action rifle that featured a 1 in 10" rifling twist. Since its introduction the 300 Winchester Magnum cartridge has become quite popular with many long range rifle shooters as it has been used to win many 1,000 yard matches in competition shooting, hunters as well quickly found that it had enough power for all game animals in North America. Using 180 grain bullets it can drop moose size animals at 400 yards, loaded with 165 grain bullets it has enough power at 500 yards for elk size game and loaded with 150 grain bullets it has enough power at 700 yards for whitetail deer with bullet energy to spare at these ranges.

 The 300 Winchester Magnum is definately a long range rifle cartridge. It is one of the few cartridges that really make the case for free boring and a longer rifle action, with heavy bullets seated deeply in the cartridge case it's full potential can not be realized by the limited case capacity of deep seated bullets in the 200 grain to 220 grain weight range. However loaded with bullets that weigh 150 grains to 180 grains plenty of performance can be extracted from the 300 Winchester Magnum cartridge case capacity.

 The 300 Winchester Magnum has always given top performance to those that handload their own ammunition for the simple fact you can tweak loadings for top performance. Hornady has seen fit to address this issue with their superformance ammunition offering loadings to boost performance for non-reloaders. The ballistics on these rounds are impressive breathing more fire into an already great cartridge.

 To achieve maximum accuracy from your 300 Winchester 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.


300 Winchester Magnum / Hunting Applications:

243 Winchester vs. 260 Remington vs. 7mm-08 Remington vs. 308 Winchester.
25-06 Remington vs. 270 Winchester vs. 280 Remington vs. 30-06 Springfield.
264 Winchester Magnum vs. 7mm Remington Magnum vs. 300 Winchester Magnum.
 These are down range trajectory charts for the 300 Winchester 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.
Elk Size Game: Such As, Caribou, Black Bear, Sheep And Elk.
Moose Size Game: Such As, Brown Bear And Moose.
Good Predator Hunting Load:
300 Win. Mag. rifle cartridge manufacturer: Hornady.
Bullet weight: 150 Grains.
Bullet ballistic coefficient: .415.
Bullet muzzle velocity: 3,400 Feet Per Second.
Bullet muzzle energy: 3,850 Foot Pounds.
Bullet trajectory is set at 1 inch mid-range rise.
Rifle true zero is 200 Yards.
Maximum point blank range is 237 yards.
150 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 - 4.9 - 14.7 - 30.2
Energy in Foot Pounds: 3,304 2,829 2,412 2,046 1,725
Predator Effectiveness: + + + + +
Good Deer Hunting Reload:
300 Win. Mag. rifle cartridge manufacturer: Handload.
Bullet weight: 150 Grains.
Bullet ballistic coefficient: .415.
Bullet muzzle velocity: 3,408 Feet Per Second.
Bullet muzzle energy: 3,868 Foot Pounds.
Bullet trajectory is set at 2 inch mid-range rise.
Rifle true zero is 247 Yards.
Maximum point blank range is 287 yards.
150 Grain Bullet
Down Range
At 100
Yards
At 200
Yards
At 300
Yards
At 400
Yards
At 500
Yards
Trajectory in Inches: + 1.6 + 1.4 - 2.8 - 11.8 - 26.4
Energy in Foot Pounds: 3,320 2,843 2,424 2,057 1,735
Deer Effectiveness + + + + +
Good Deer Hunting Load:
300 Win. Mag. rifle cartridge manufacturer: Winchester.
Bullet weight: 150 Grains.
Bullet ballistic coefficient: .469.
Bullet muzzle velocity: 3,260 Feet Per Second.
Bullet muzzle energy: 3,540 Foot Pounds.
Bullet trajectory is set at 2 inch mid-range rise.
Rifle true zero is 240 Yards.
Maximum point blank range is 285 yards.
150 Grain Bullet
Down Range
At 100
Yards
At 200
Yards
At 300
Yards
At 400
Yards
At 500
Yards
Trajectory in Inches: + 1.6 + 1.3 - 3.3 - 12.9 - 28.3
Energy in Foot Pounds: 3,088 2,688 2,332 2,015 1,732
Deer Effectiveness + + + + +
Good Elk Hunting Load:
300 Win. Mag. rifle cartridge manufacturer: Hornady.
Bullet weight: 165 Grains.
Bullet ballistic coefficient: .447.
Bullet muzzle velocity: 3,260 Feet Per Second.
Bullet muzzle energy: 3,893 Foot Pounds.
Bullet trajectory is set at 3 inch mid-range rise.
Rifle true zero is 275 Yards.
Maximum point blank range is 315 yards.
165 Grain Bullet
Down Range
At 100
Yards
At 200
Yards
At 300
Yards
At 400
Yards
At 500
Yards
Trajectory in Inches: + 2.3 + 2.6 - 1.4 - 10.6 - 25.7
Energy in Foot Pounds: 3,374 2,917 2,511 2,148 1,834
Elk Effectiveness: + + + + +
Good Moose and Large Bear Hunting Load:
300 Win. Mag. rifle cartridge manufacturer: Hornady.
Bullet weight: 180 Grains.
Bullet ballistic coefficient: .480.
Bullet muzzle velocity: 3,130 Feet Per Second.
Bullet muzzle energy: 3,917 Foot Pounds.
Bullet trajectory is set at 4 inch mid-range rise.
Rifle true zero is 297 Yards.
Maximum point blank range is 350 yards.
180 Grain Bullet
Down Range
At 100
Yards
At 200
Yards
At 300
Yards
At 400
Yards
At 500
Yards
Trajectory in Inches: + 3.0 + 3.7 - 0.2 - 9.5 - 25.0
Energy in Foot Pounds: 3,424 2,983 2,589 2,238 1,925
Moose Effectiveness: + + + + -

300 Winchester Magnum / Specifications:
Rifle:
Barrel Length - 24".
Bore Twist Rate - 1 in 10".
Bore Groove Diameter - .308".
Cartridge:
Bullet Diameter - .308".
Primer Size - Large Rifle, Type - Magnum.
Case Neck Diameter - .339".
Case Shoulder Diameter - .489".
Case Base Diameter - .513".
Case Rim Diameter - .532".
Maximum Case Length - 2.620".
Trimmed Case Length - 2.610".
Maximum Overall Length - 3.340".
Ammunition:
300 Winchester
Magnum
Cartridge
Manufacturer
Bullet
Weight
Grains
Bullet
Ballistic
Coefficient
Bullet
Muzzle
Velocity
Fps.
Bullet
Muzzle
Energy
Ft. lbs.
8.5 lb. Rifle,
Recoil
Energy
Ft. lbs.
Hornady 150 .415 3,400 3,850 29.22
Winchester 150 .469 3,260 3,540 27.85
Norma 155 .305 3,280 3,703 29.12
Hornady 165 .447 3,260 3,893 31.10
Cor-Bon 168 .404 3,125 3,643 30.22
Hornady 178 .495 2,960 3,463 30.35
Winchester 180 .527 3,000 3,597 31.24
Remington 190 .533 2,900 3,548 31.99
Hornady 195 .550 2,930 3,717 33.42
Nosler 200 .588 2,800 3,482 32.62

Rifle Ballistics:
.30" Caliber
7.62x51mm NATO
30-30 Win.
308 Win.
30-06 Sprg.
300 Win. Mag.
300 WSM
300 Wby. Mag.

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