300 Winchester Magnum Centerfire Rifle Cartridge:
The popular 300 Winchester Magnum centerfire rifle cartridge is a commercial, belted, bottleneck cartridge case design that is loaded commercially (factory produced ammunition) or reloaded by individual handloaders with various combinations of primer, powder and .308″ diameter bullets.
Handloaders can calculate the kinetic energies of their handloads with the use of these formulas.
300 Winchester Magnum Reloading Specifications:
Bullet Diameter – .308″.
Primer Diameter – .210″.
Primer Type – Large Rifle Magnum.
Case Neck Diameter – .339″.
Case Shoulder Diameter – .489″.
Case Base Diameter – .513″.
Case Rim Diameter – .532″.
Minimum Case Length – 2.610″ / Trimmed.
Maximum Case Length – 2.620″ / Stretched.
Minimum Cartridge Overall Loaded Length – 3.215″.
Maximum Cartridge Overall Loaded Length – 3.340″.
Maximum Average Pressure – 64,000 Pounds Per Square Inch.
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.
|Test Powder Used = Ramshot Hunter.|
Test Bullet Used = Hornady – SST – .308″ diameter.
Test Primer Used = Federal 215.
Test Case Used = Winchester – 300 Winchester Magnum.
Test Case Trimmed Length = 2.610″.
Loaded Cartridge Overall Length = 3.340″.
Test Barrel Length = 24″.
Test Barrel Twist Rate = 1 in 10″.
|Short Range Ballistics Table For Above Load:|
|Big Game||150||.415||3,408||3,868||0||– 2.0″||– 4.5″|
|Long Range Ballistics Table For Above Load:|
|Bullet||100 yds.||200 yds.||300 yds.||400 yds.||500 yds.||600 yds.||700 yds.|
|Trajectory||+ 1.0″||0||– 5.1″||– 15.0″||– 30.5″||– 52.7″||– 82.9″|
|Maximum Effective Range For Thin Skinned Big Game: 700 Yards.|
Maximum Effective Range For Thick Skinned Big Game: 500 Yards.
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