Performance
The .30-378 case holds as much as 120 grains (8 g) of powder without requiring a compressed load. This allows the cartridge to develop more energy than the .300 Remington Ultra Magnum and .300 Winchester Magnum, especially when handloads are used.
| Cartridge | Bullet Weight | Muzzle velocity | Muzzle energy | Notes | |||
|---|---|---|---|---|---|---|---|
| gr | g | ft/s | m/s | ft·lbf | J | ||
| .458 Win Mag | 500 | 32 | 2,240 | 680 | 5,570 | 7,550 | Winchester Safari Supreme loading |
| .338 Lapua | 300 | 19 | 2,800 | 850 | 5,224 | 7,083 | Black Hills Ammo loading |
| .375 H&H | 300 | 19 | 2,705 | 824 | 4,875 | 6,610 | Hornady Heavy Magnum loading |
| .30-378 Wby | 200 | 13 | 3,160 | 960 | 4,434 | 6,012 | Weatherby factory load |
| .300 RUM | 200 | 13 | 3,100 | 940 | 4,269 | 5,788 | Loading from Nosler custom |
| .300 Win Mag | 180 | 12 | 3,050 | 930 | 3,720 | 5,040 | Reference load by Doubletapammo |
Note: Using the bullet weight and muzzle velocity in each cartridge that provided the maximum muzzle energy. Data for the .30-378 is from. Loading data for all other cartridges can be found at
| Cartridge | Weight | Ballistic Coefficient |
Muzzle Velocity | Muzzle Energy | Velocity at 440 yd (400 m) | Energy at 440 yd (400 m) | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| gr | g | ft/s | m/s | ft·lbf | J | ft/s | m/s | ft·lbf | J | ||
| .30-06 | 165 | 11 | 0.475 | 2,938 | 896 | 3,165 | 4,291 | 2,110 | 640 | 1,633 | 2,214 |
| .30-378 | 165 | 11 | 0.475 | 3,500 | 1,100 | 4,448 | 6,031 | 2,576 | 785 | 2,428 | 3,292 |
| .30-06 | 180 | 12 | 0.507 | 2,798 | 853 | 3,130 | 4,240 | 2,044 | 623 | 1,668 | 2,262 |
| .30-378 | 180 | 12 | 0.507 | 3,420 | 1,040 | 4,676 | 6,340 | 2,559 | 780 | 2,619 | 3,551 |
| .30-06 | 200 | 13 | 0.481 | 2,586 | 788 | 2,972 | 4,029 | 1,841 | 561 | 1,502 | 2,036 |
| .30-378 | 200 | 13 | 0.481 | 3,160 | 960 | 4,434 | 6,012 | 2,300 | 700 | 2,351 | 3,188 |
Note: data for the .30-378 from Weatherby (which tracks closely to what handloaders can achieve based on loading data at. Data from the .30-06 is also from Hodgdon. The initial data used is included here for anyone who cares to run the calculations themselves.
Read more about this topic: .30-378 Weatherby Magnum
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