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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 10%,  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: .358-378 Real Guns

  Rifle: Custom Ruger No.1   Max COL: 3.750″
  Barrel: 26″   Reloading Dies: CH4D
  Max case length: 2.913″   Group distance: 100 yards
 Note: This is a Real Guns project rifle based on the .378 Weatherby case necked down to a .358″ bore, retaining the double radius Weatherby shoulder.

Bullet Type Bullet
Weight
Bullet
Diameter
C.O.L. Net Water
Capacity
Powder
Type
Charge Primer
Type
Muzzle
Velocity
Muzzle
Energy
Group
Size
 Hornady Interlock 3510 200 .358″ 3.580″ 132.0 Reloder 19 116.5 CCI 250 3420 5190 1.5″
 Hornady Interlock 3510 200 358″ 3.580″ 132.0 IMR 7828 118.0 CCI 250 3360 5015 1.6″
 Sierra GameKing 2850 225 358″ 3.580″ 129.4 Reloder 22 118.0 CCI 250 3310 5475 1.9″
 Sierra GameKing 2850 225 358″ 3.580″ 129.4 IMR 7828 119.0 CCI 250 3330 5551 2.0″
Speer Grand Slam 250 .358 3.600 125.3 Reloder 22 114.4 CCI 250 3230 5793 1.0
Speer Grand Slam 250 .358 3.600 125.3 IMR 7828 115.3 CCI 250 3250 5865 0.7
Speer Grand Slam 250 .358 3.600 125.3 H1000 122.0 CCI 250 3235 5811 1.5
 Barnes X 35835 250 358″ 3.750″ 125.2 Reloder 22 111.6 CCI 250 3195 5668 1.3
 Barnes X 35835 250 358″ 3.750″ 125.2 IMR 7828 112.7 CCI 250 3220 5757 1.1
 Barnes X 35835 250 358″ 3.750″ 125.2 H1000 119.5 CCI 250 3210 5721 1.3
 Barnes X 35835 250 358″ 3.750″ 125.2 IMR 4831 107.5 CCI 250 3120 5405 1.4
Nosler Partition 250 .358″ 3.750″ 126.3 Re 22 106.0 Fed 215 3002 5004 0.7
Nosler Partition 250 .358″ 3.750″ 126.3 Re 25 110.0 Fed 215 3015 5047 0.5
Nosler Partition 250 .358″ 3.750″ 126.3 IMR 7828 107.0 Fed 215 3055 5182 0.9
 Swift A-Frame 280 .358″ 3.700″ 126.2 Reloder 22 111.5 CCI 250 3060 5823 1.0
 Swift A-Frame 280 .358″ 3.700″ 126.2 H1000 119.2 CCI 250 3070 5861 1.3
 Swift A-Frame 280 .358″ 3.700″ 126.2 Reloder 25 120.5 CCI 250 3105 5996 1.0
 Swift A-Frame 280 .358″ 3.700″ 126.2 IMR 7828 112.5 CCI 250 3085 5919 0.5
 Woodleigh SN W54 310 .358″ 3.655 123.5 H870 126.0 CCI 250 2995 6176 1.7
 Woodleigh SN W54 310 .358″ 3.655 123.5 H1000 114.5 CCI 250 2920 5871 1.2
 Woodleigh SN W54 310 .358″ 3.655 123.5 Reloder 22 107.0 CCI 250 2900 5790 0.7
 Woodleigh SN W54 310 .358″ 3.655 123.5 Reloder 25 115.6 CCI 250 2955 6012 1.6
 Woodleigh SN W54 310 .358″ 3.655 123.5 IMR 7828 107.7 CCI 250 2925 5891 1.1