300 Weatherby Magnum History and General Information.  The 300 Weatherby Magnum was introduced to the public in 1948 by Roy Weatherby. The 300 Weatherby Magnum cartridge case itself is nothing more than an improved version of the 300 H&H magnum made by blowing out the full length of the case which then sports a double radius shoulder and a long neck.  The 300 Weatherby Magnum is a very powerful cartridge, loaded with a 220 grain bullet and delivering 2 tons of energy at the muzzle you can safely hunt all of the north american game animals and most african game animals.  The 300 Weatherby Magnum when loaded with 165 - 180 grain boat tail bullets becomes a very effective long range mountain rifle when going after goats and sheep.  The 300 Weatherby Magnum is well known for heavy recoil and will make most average rifleman flinch badly anticipating the recoil, a good idea to keep shooting this rifle accurately is to load down into the 130 grain bullet weight range and do some target practice or varminting as this reduces the recoil tremendously on the 300 Weatherby Magnum.   300 Weatherby Magnum Barrel Specifications. Common Barrel Twist Rate - 1/10 - 1/12 Bore Groove Diameter - .3075"   300 Weatherby Magnum Reloading Specifications. Bullet Diameter - .308" Maximum Case Length - 2.825" Trimmed Case Length - 2.815" Primer Size - Large Rifle   300 Weatherby Magnum Loading Data Hints.  The 300 Weatherby Magnum when loaded with 130 grain bullets backed up with a charge of i.m.r. 4831 powder will deliver exceptional accuracy at high velocity, around 3,500 feet per second. 300 Weatherby Magnum Reloading Data. Hodgdon Reloading Data Center.   300 Weatherby Magnum Trajectory and Hunting Applications.  This is a down range trajectory chart for the 300 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 .308" Bullet weight 180 grains Bullet ballistic coeffecient .482 Bullet velocity 3,200 feet per second Range 100 yds. 200 yds. 300 yds. 400 yds. 500 yds. + + 1.2 0 - 5.7 - 17.0 - 34.4 3574 3107 2689 2319 1993  Varmint + + + + + +  Deer + + + + + +  Elk + + + + + +  Moose + + + + + - Copyright 2001 - 2010