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300 Winchester Magnum:
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.

300 Winchester Magnum Rifle Barrel Specifications:
Bore Twist Rate - 1 in 10".
Bore Groove Diameter - .308"

300 Winchester Magnum Cartridge Case Dimensions:
Neck Diameter - .339".
Shoulder Diameter - .489".
Base Diameter - .513".
Rim Diameter - .532".

300 Winchester Magnum Reloading Specifications:
Bullet Diameter = .308".
Maximum Case Length = 2.620".
Trimmed Case Length = 2.610".
Primer Size = Large Rifle, Type = Magnum.
Maximum Cartridge Overall Length = 3.340".

300 Winchester Magnum Reloading Data:
 For the Antelope, Hog, Blacktail, Whitetail or Mule Deer hunter hand-loading or reloading his or her own 300 Winchester Magnum ammunition, Western Powders, Ramshot Hunter rifle powder does an impressive job of launching 150 grain .308" diameter bullets at high velocity. Ramshots online reloading data shows that a 150 grain .308" diameter Hornady SST bullet using 69.9 grains of Ramshot Hunter powder can be driven to a velocity of 3,118 feet per second loaded at a maximum cartridge overall length of 3.340" in the 300 Winchester Magnum. This load does not top out until the 150 grain bullet is at 3,408 feet per second at a chamber pressure of 63,982 PSI. For the 150 grain bullet reload if you sighted your 300 Winchester Magnum hunting rifle in dead on at 245 yards it would only be 2 inches high at 150 yards and only 3.0 inches low at 300 yards which would be an excellent Antelope, Hog, Blacktail Deer, Whitetail Deer or Mule Deer load.
300 Winchester Magnum / Reloading

300 Winchester Magnum Factory Ammunition:
 The below table will give rifle cartridge manufacturer, bullet weight measured in grains, bullet velocity measured in feet per second, bullet energy measured in foot pounds and rifle recoil energy measured in foot pounds based on a fully loaded and scoped 8.5 pound, 24" barrel length rifle.

Centerfire Rifle Cartridge /
Cartridge Manufacturer;
CB=Cor-Bon, H=Hornady,
N1=Norma N2=Nosler,
R=Remington, W=Winchester
Bullet
Weight
Grains
Bullet
Ballistic
Coefficient
Bullet
Muzzle
Velocity
Fps.
Bullet
Muzzle
Energy
Ft. lbs.
Rifle
Recoil
Energy
Ft. lbs.
300 Win. Mag. / H 150 .415 3,400 3,850 29.22
300 Win. Mag. / W 150 .469 3,260 3,540 27.85
300 Win. Mag. / N1 155 .305 3,280 3,703 29.12
300 Win. Mag. / H 165 .447 3,260 3,893 31.10
300 Win. Mag. / CB 168 .404 3,125 3,643 30.22
300 Win. Mag. / H 178 .495 2,960 3,463 30.35
300 Win. Mag. / W 180 .527 3,000 3,597 31.24
300 Win. Mag. / R 190 .533 2,900 3,548 31.99
300 Win. Mag. / H 195 .550 2,930 3,717 33.42
300 Win. Mag. / N2 200 .588 2,800 3,482 32.62
300 Winchester Magnum / Hunting & Ballistics

300 Winchester Magnum And Moose Size Game Hunting:
Moose Size Animals Include: Grizzly Bear, Brown Bear And Moose. These animals are quite large and offer about an eight inch target zone, for a correct rifle sight-in, a four inch mid-range is required for minimum bullet trajectory effect.
For this size animal, I prefer 2,000 foot pounds of bullet energy.

300 Winchester Magnum Hunting Ammunition:
Ammuntion: Hornady 300 Win. Mag. Superformace 180 Grain.
Bullet Diameter: .308 Inch.
Bullet Weight: 180 Grains.
Bullet Ballistic Coeffecient: .480.
Rifle Barrel Length: 24 Inches.
Rifle scope mounted 1.8 inches above bore center-line.
Rifle bullet trajectory set at 4 inch mid-range rise.
Rifle true zero at 297 Yards.
Maximum point blank range is 350 yards.
Note: (FPS. = Feet Per Second.) (IN. = Inches.) (FT. LBS. = Foot Pounds.)
Range
Muzzle
100 yds.
200 yds.
300 yds.
400 yds.
500 yds.
Bullet Velocity / FPS.:
3,130
2,927
2,732
2,546
2,366
2,195
Bullet Trajectory / IN.:
- 1.8"
+ 3.0"
+ 3.7"
- 0.2"
- 9.5"
- 25.0"
Bullet Energy / FT. LBS.:
3,917
3,424
2,983
2,589
2,238
1,925
Moose Size Animals:
+
+
+
+
+
+

300 Winchester Magnum And Elk Size Game Hunting:
Elk Size Animals Include: Caribou, Black Bear, Sheep And Elk. These animals can be quite large and offer about an six inch target zone, for a correct rifle sight-in, a three inch mid-range is required for minimum bullet trajectory effect.
For this size animal, I prefer 1,800 foot pounds of bullet energy.

300 Winchester Magnum Hunting Ammunition:
Ammuntion: Hornady 300 Win. Mag. Superformace 165 Grain.
Bullet Diameter: .308 Inch.
Bullet Weight: 165 Grains.
Bullet Ballistic Coeffecient: .447.
Rifle Barrel Length: 24 Inches.
Rifle scope mounted 1.8 inches above bore center-line.
Rifle bullet trajectory set at 3 inch mid-range rise.
Rifle true zero at 275 Yards.
Maximum point blank range is 315 yards.
Note: (FPS. = Feet Per Second.) (IN. = Inches.) (FT. LBS. = Foot Pounds.)
Range
Muzzle
100 yds.
200 yds.
300 yds.
400 yds.
500 yds.
Bullet Velocity / FPS.:
3,260
3,035
2,822
2,618
2,424
2,237
Bullet Trajectory / IN.:
- 1.8"
+ 2.3"
+ 2.6"
- 1.4"
- 10.6"
- 25.7"
Bullet Energy / FT. LBS.:
3,893
3,374
2,917
2,511
2,148
1,834
Elk Size Animals:
+
+
+
+
+
+

300 Winchester Magnum And Deer Size Game Hunting:
Deer Size Animals Include: Antelope, Blacktail Deer, Hogs, Javelina, Mule Deer And Whitetail Deer. These animals can be somewhat small at times and offer about an four inch target zone, for a correct rifle sight-in, a two inch mid-range is required for minimum bullet trajectory effect.
For this size animal, I prefer 1,200 foot pounds of bullet energy.

300 Winchester Magnum Hunting Ammunition:
Ammuntion: Hornady 300 Win. Mag. Superformace 150 Grain.
Bullet Diameter: .308 Inch.
Bullet Weight: 150 Grains.
Bullet Ballistic Coeffecient: .415.
Rifle Barrel Length: 24 Inches.
Rifle scope mounted 1.8 inches above bore center-line.
Rifle bullet trajectory set at 2 inch mid-range rise.
Rifle true zero at 247 Yards.
Maximum point blank range is 290 yards.
Note: (FPS. = Feet Per Second.) (IN. = Inches.) (FT. LBS. = Foot Pounds.)
Range
Muzzle
100 yds.
200 yds.
300 yds.
400 yds.
500 yds.
Bullet Velocity / FPS.:
3,400
3,150
2,914
2,691
2,479
2,276
Bullet Trajectory / IN.:
- 1.8"
+ 1.6"
+ 1.4"
- 2.8"
- 11.9"
- 26.6"
Bullet Energy / FT. LBS.:
3,850
3,304
2,829
2,412
2,046
1,725
Deer Size Animals:
+
+
+
+
+
+

Directory:
Rifles
Rifle Ammunition
Rifle Dies
Rifle Brass
Rifle Bullets
Winchester, Model 70, 243 Winchester, 264 Winchester Magnum, 270 Winchester, 30-30 Winchester, 308 Winchester, 300 Winchester Magnum.
Short Magnums, 223 Winchester Super Short Magnum, 243 Winchester Super Short Magnum, 25 Winchester Super Short Magnum,
270 Winchester Short Magnum, 7mm Winchester Short Magnum, 300 Winchester Short Magnum, 325 Winchester Short Magnum.
Centerfire Rifle Cartridges, 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, 257 Wby. Mag., 6.5 x 55mm, 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, 300 Win. Mag., 300 WSM, 300 Wby. Mag., 325 WSM,
340 Wby. Mag., 357 Mag., 44 Mag., 45-70.