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1-d.gif - 1035 Bytes.270 Weatherby Magnum
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Ballistics
Gunsmithing
Reloading
Shooting
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270 Weatherby Magnum History and General Information:

 The 270 Weatherby Magnum was introduced to the shooting public in 1945 by Roy Weatherby. The cartridge case itself is a shortened 300 H&H Magnum case with the body blown out and necked down to accept a .27 caliber bullet.

 The 270 Weatherby Magnum is an excellent, accurate, and flat shooting cartridge that is capable of taking any big game in the lower 48 states and is one of the more powerful 27 caliber cartridges, when loaded with 130 grain bullets at 3300 feet per second it is a very adequate round for deer at 500 yards and when loaded with 150 grain bullets at 3200 feet per second it is a very adequate round for elk at 400 yards.

 The 270 Weatherby Magnum will recoil considerably with 150 grain bullets but if loaded down with 110 grain varmint bullets to a velocity of around 3,400 feet per second the recoil is quite tolerable.

  270 Weatherby Magnum Barrel Specifications.
Common Barrel Twist Rate - 1/10 - 1/12
Bore Groove Diameter - .277"

  270 Weatherby Magnum Reloading Specifications.
Bullet Diameter - .277"
Maximum Case Length - 2.550"
Trimmed Case Length - 2.540"
Primer Size - Large Rifle

270 Weatherby Magnum Loading Data Hints.
 The 270 Weatherby Magnum will come to life with slower burning powders IMR 4350 and 4831, when using 150 grain weight bullets the full devastating power potential of this cartridge will be realized.

270 Weatherby Magnum Reloading Data.
Hodgdon Reloading Data Center.

270 Weatherby Magnum Trajectory and Hunting Applications.

 This is a down range trajectory chart for the 270 Weatherby Magnum cartridge with the scope mounted 1.5 inches above the bore center line plus if you were using this load, its effective hunting bullet energy range with well placed shots on,
Varmint / Predator size game, such as Bobcat, Cougar, Coyote.
Deer size game, such as Antelope, Blacktail, Hogs, Javelina, Mule, Whitetail.
Elk size game, such as Caribou, Black Bear, Sheep.
Moose size game, such as Brown Bear.
Bullet diameter .264"
Bullet weight 140 grains
Bullet ballistic coeffecient .441
Bullet velocity 3,100 feet per second
Range
100 yds.
200 yds.
300 yds.
400 yds.
500 yds.
+
+ 1.4
0
- 6.5
- 18.8
- 38.1
2570
2199
1872
1588
1341
 Varmint
+
+
+
+
+
+
 Deer
+
+
+
+
+
+
 Elk
+
+
+
-
-
-
 Moose
+
+
-
-
-
-











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Reloading - Equipment - How To - Accuracy - Brass - Primers - Powder - Bullets - Load Testing - Run-Out.
Select Correct Barrel Twist Rate - Properly Mount Your Rifle Scope - Properly Break-In Your Rifle Barrel - Properly Sight-In Your Rifle.
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 Rem., 257 Wby. Mag., 6.5 x 55mm, 260 Rem., 6.5mm Rem. Mag., 264 Win. Mag., 6.8 Rem.SPC,
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 Government.