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Warning: Bullet selections are specific, and loads are not valid with substitutions of different bullets of the same weight. Variations in bullet length will alter net case capacity,  pressure and velocity. Primer selection is specific and primer types are not interchangeable. These are maximum loads in my firearms and may easily be excessive in others. All loads should be reduced by 5%,  and developed following safe handloading practices as represented in established reloading manuals produced by component manufacturers. Presentation of these loads does not constitute a solicitation for their use, nor a recommendation.
 

Cartridge: 338 Winchester Magnum

  Firearm: Ruger M77 Hawkeye African   Max COL: 3.340″ Exceptions Noted
  Bullet Diameter: 0.338″   Primer: CCI 250
  Barrel: 23″   Reloading Dies: Lee FL & Factory crimp
  Max case length: 2.500″   Group: Distance 100 yards – Three shots
 

COL and Capacity   Load Data & Performance
Bullet Type Bullet
Weight
C.O.L.
Inches
Case
Grains
Water
  Powder Charge
Grains
Muzzle
Velocity
FPS
Muzzle
Energy Ft/Lbs
Group
Inches
Nosler AccuBond 180 3.280 76.1   Re17 73.5 3182 4046 0.9
Nosler AccuBond 180 3.280 76.1   H414 75.5 3150 3966 0.5
Nosler AccuBond 180 3.280 76.1   IMR4895 68.5 3167 4008 1.1
Nosler AccuBond 180 3.280 76.1   Win760 76.0 3128 3911 1.1
Nosler BallisticTip 200 3.340 75.2   Re17 71.0 3008 4019 1.0
Nosler BallisticTip 200 3.340 75.2   H414 73.0 3014 4033 0.9
Nosler BallisticTip 200 3.340 75.2   RS Big Game 70.5 3002 4003 1.4
Nosler BallisticTip 200 3.340 75.2   Win760 73.5 3034 4088 1.2
Speer Hot-Core SP 200 3.310 78.4   Re17 73.5 3081 4216 0.6
Speer Hot-Core SP 200 3.310 78.4   H414 75.5 3042 4111 0.9
Speer Hot-Core SP 200 3.310 78.4   RS Big Game 72.5 3013 4031 1.2
Speer Hot-Core SP 200 3.310 78.4   Win760 76.0 3062 4165 1.1
Sierra GameKing 215 3.340 77.1   H414 73.0 2926 4086 0.8
Sierra GameKing 215 3.340 77.1   IMR4350 72.5 2864 3916 1.0
Sierra GameKing 215 3.340 77.1   RS Hunter 75.0 2914 4053 1.1
Sierra GameKing 215 3.340 77.1   Win760 73.5 2945 4141 1.0
Speer SPBT 225 3.310 75.9   RS Hunter 74.0 2878 4139 1.3
Speer SPBT 225 3.310 75.9   Win760 72.0 2889 4169 1.1
Hornady SST 225 3.340 72.6   Re17 67.5 2846 4047 0.9
Hornady SST 225 3.340 72.6   H414 70.0 2857 4078 0.8
Hornady SST 225 3.340 72.6   RS Hunter 67.0 2816 3961 1.3
Hornady SST 225 3.340 72.6   Win760 69.5 2865 4101 1.1
Speer 250 3.300 73.9   Re17 66.5 2707 4068 0.7
Speer 250 3.300 73.9   H414 68.5 2708 4071 0.9
Speer 250 3.300 73.9   IMR4350 68.0 2648 3892 0.9
Speer 250 3.300 73.9   RS Hunter 71.0 2719 4105 1.2
Sierra 250 3.340 73.1   BL-C2 64.0 2663 3936 1.3
Sierra 250 3.340 73.1   H4350 67.5 2669 3956 1.0
Sierra 250 3.340 73.1   H414 68.0 2717 4097 0.6
Sierra 250 3.340 73.1   RS Hunter 71.0 2747 4187 0.9
Woodleigh 250 3.265 74.1   Re19 71.0 2701 4050 1.0
Woodleigh 250 3.265 74.1   H414 68.5 2719 4104 1.0
Woodleigh 250 3.265 74.1   RS Hunter 71.0 2748 4191 1.2
Swift 275 3.250 70.3   Re19 67.0 2580 4063 1.2
Swift 275 3.250 70.3   H414 64.0 2570 4034 0.7
Swift 275 3.250 70.3   IMR7828SC 69.0 2590 4096 1.3
Swift 275 3.250 70.3   RS Hunter 66.0 2569 4-30 1.2