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 + + - - - - Copyright 2001 - 2010