Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:250 gr
Bullet Diameter:0.376"
Bullet Length:<<locked>>
Caliber:.378 Weath. Mag. load data
Case Length (l3):2.913"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:137 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:26"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:16.0
Load data in caliber .378 Weath. Mag. with .376 | 250gr | Peregrine Plainsmaster (VLR-4) bullet and 105 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, ReloadSwiss RS 70 and Alliant Reloder-16.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 84% | 55,883 psi | 88% | 2867 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,215 psi | 85% | 2894 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,242 psi | 80% | 2930 fps | 99.5% |
| Accurate 4064 | <<locked>> | 86% | 56,275 psi | 88% | 2927 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 57,406 psi | 90% | 3041 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 53,679 psi | 84% | 3074 fps | 96% |
| ADI AR 2206H | <<locked>> | 82% | 55,782 psi | 87% | 2963 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 57,072 psi | 89% | 2966 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,085 psi | 86% | 3035 fps | 98.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 52,649 psi | 83% | 3022 fps | 96.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,463 psi | 88% | 3097 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,157 psi | 85% | 2940 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,462 psi | 85% | 2963 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,766 psi | 86% | 3048 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 56,115 psi | 88% | 3074 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,288 psi | 85% | 3022 fps | 98.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,256 psi | 80% | 3018 fps | 97.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,341 psi | 76% | 2953 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,018 psi | 66% | 2867 fps | 98.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,782 psi | 87% | 3156 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,912 psi | 88% | 2982 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,876 psi | 73% | 2936 fps | 96.8% |
| Bofors RP3 | <<locked>> | 86% | 54,897 psi | 86% | 2953 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,256 psi | 80% | 3018 fps | 97.9% |
| Bofors RP7 | <<locked>> | 90% | 54,491 psi | 85% | 2940 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 86% | 55,448 psi | 87% | 2972 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 56,260 psi | 88% | 3045 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 90% | 55,999 psi | 88% | 3002 fps | 98.6% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 56,579 psi | 89% | 3028 fps | 96.8% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 55,347 psi | 87% | 3009 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 82% | 56,391 psi | 88% | 2969 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,897 psi | 86% | 2966 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,739 psi | 89% | 3009 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 56,681 psi | 89% | 3084 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,085 psi | 57% | 1834 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,653 psi | 90% | 2972 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 57,058 psi | 89% | 2943 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,492 psi | 89% | 2949 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,840 psi | 88% | 2936 fps | 99.3% |
| IMR 4350 | <<locked>> | 94% | 55,506 psi | 87% | 2972 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,260 psi | 88% | 2969 fps | 99.3% |
| IMR 4831 | <<locked>> | 94% | 54,259 psi | 85% | 2979 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,898 psi | 88% | 2992 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,607 psi | 86% | 2959 fps | 96.6% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 50,038 psi | 78% | 2989 fps | 96.1% |
| Lovex D073.6 | <<locked>> | 82% | 56,057 psi | 88% | 2930 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,723 psi | 86% | 2884 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,507 psi | 89% | 2940 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,101 psi | 88% | 2963 fps | 99.9% |
| Lovex S070 | <<locked>> | 94% | 57,392 psi | 90% | 3005 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,337 psi | 66% | 2772 fps | 98.1% |
| Norma 201 | <<locked>> | 82% | 54,360 psi | 85% | 2900 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,201 psi | 87% | 2900 fps | 100% |
| Norma 203B | <<locked>> | 86% | 57,217 psi | 90% | 2999 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,246 psi | 88% | 3028 fps | 98.3% |
| Norma MRPᴾ | <<locked>> | 100% | 54,462 psi | 85% | 3107 fps | 99.4% |
| Norma URP | <<locked>> | 94% | 56,159 psi | 88% | 3028 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,476 psi | 85% | 2972 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 50,212 psi | 79% | 3002 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 94% | 54,955 psi | 86% | 3028 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,512 psi | 70% | 2871 fps | 97% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,680 psi | 57% | 1880 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,477 psi | 87% | 2956 fps | 99.6% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,405 psi | 87% | 3031 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,593 psi | 87% | 3068 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 57,479 psi | 90% | 3068 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 56,202 psi | 88% | 3104 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 40,988 psi | 64% | 2884 fps | 96.9% |
| Rottweil R 902 | <<locked>> | 84% | 54,998 psi | 86% | 2900 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,911 psi | 86% | 2949 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,855 psi | 89% | 3005 fps | 97.6% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 57,072 psi | 89% | 3064 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 90% | 54,491 psi | 85% | 2940 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,101 psi | 88% | 2963 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,057 psi | 88% | 2930 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,507 psi | 89% | 2940 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 57,392 psi | 90% | 3005 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,739 psi | 89% | 3012 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 57,101 psi | 89% | 2969 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,288 psi | 85% | 2933 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,434 psi | 87% | 2831 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,246 psi | 88% | 2831 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,985 psi | 88% | 2917 fps | 99.4% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,565 psi | 89% | 3058 fps | 98.7% |
| Somchem S335 | <<locked>> | 82% | 55,027 psi | 86% | 2828 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,855 psi | 89% | 2953 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,882 psi | 86% | 2943 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 54,998 psi | 86% | 2940 fps | 96.4% |
| Somchem S365 | <<locked>> | 96% | 55,259 psi | 87% | 3025 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 57,667 psi | 90% | 3035 fps | 99.3% |
| Vihtavuori N133 | <<locked>> | 82% | 55,970 psi | 88% | 2812 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,332 psi | 87% | 2858 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,811 psi | 87% | 2877 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,362 psi | 88% | 2920 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,868 psi | 86% | 2969 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,748 psi | 78% | 2894 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 86% | 57,566 psi | 90% | 2923 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 57,450 psi | 90% | 3025 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,041 psi | 85% | 3031 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 54,911 psi | 86% | 3094 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,491 psi | 85% | 2936 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,420 psi | 88% | 3048 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,511 psi | 68% | 3005 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,302 psi | 85% | 2940 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,288 psi | 85% | 2972 fps | 98.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 49,023 psi | 77% | 2772 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,456 psi | 74% | 2779 fps | 97.6% |
| Accurate 3100 | <<locked>> | 88% | 33,634 psi | 53% | 2579 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 46,456 psi | 73% | 2779 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,983 psi | 55% | 2631 fps | 97.7% |
| Accurate MAGPRO | <<locked>> | 98% | 49,879 psi | 78% | 3012 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 52,257 psi | 82% | 2907 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,440 psi | 70% | 2759 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 42,250 psi | 66% | 2795 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 98% | 49,182 psi | 77% | 2956 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,936 psi | 77% | 2976 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,657 psi | 70% | 2782 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,747 psi | 75% | 2851 fps | 100% |
| Alliant Reloder-16 | 84.5 gr | 80% | 34,679 psi | 54% | 2648 fps | 97.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,233 psi | 61% | 2779 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 41,771 psi | 65% | 2785 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 94% | 41,785 psi | 65% | 2835 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,077 psi | 39% | 2385 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 92% | 32,445 psi | 51% | 2625 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 84% | 30,661 psi | 48% | 2621 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,156 psi | 82% | 2923 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 41,205 psi | 65% | 2818 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 44,773 psi | 70% | 2792 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 41,785 psi | 65% | 2835 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 39,523 psi | 62% | 2654 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 45,266 psi | 71% | 2799 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 37,304 psi | 58% | 2684 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 80% | 40,422 psi | 63% | 2710 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 96% | 49,298 psi | 77% | 2907 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 98% | 51,677 psi | 81% | 2949 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 80% | 52,823 psi | 83% | 2917 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,053 psi | 50% | 2539 fps | 98.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,545 psi | 78% | 2900 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 39,131 psi | 61% | 2756 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,890 psi | 42% | 1640 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,734 psi | 80% | 2867 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,447 psi | 84% | 2894 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,731 psi | 73% | 2792 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,095 psi | 77% | 2822 fps | 98.5% |
| IMR 4350 | <<locked>> | 82% | 37,724 psi | 59% | 2638 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,104 psi | 64% | 2690 fps | 96.7% |
| IMR 4831 | <<locked>> | 80% | 33,924 psi | 53% | 2589 fps | 97.5% |
| IMR 4895 | <<locked>> | 80% | 48,979 psi | 77% | 2881 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 48,080 psi | 75% | 2848 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 98% | 46,731 psi | 73% | 2923 fps | 95.2% |
| Lovex D073.6 | <<locked>> | 80% | 52,431 psi | 82% | 2881 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,474 psi | 81% | 2835 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,789 psi | 73% | 2789 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,493 psi | 60% | 2638 fps | 97.4% |
| Lovex S070 | <<locked>> | 80% | 36,651 psi | 57% | 2615 fps | 95.7% |
| Lovex S071 | <<locked>> | 92% | 32,460 psi | 51% | 2549 fps | 95% |
| Norma 201 | <<locked>> | 80% | 51,068 psi | 80% | 2851 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,692 psi | 81% | 2848 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,094 psi | 74% | 2838 fps | 100% |
| Norma 204 | <<locked>> | 86% | 42,728 psi | 67% | 2785 fps | 95.4% |
| Norma MRP | <<locked>> | 90% | 38,232 psi | 60% | 2785 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 35,201 psi | 55% | 2631 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 80% | 47,485 psi | 74% | 2861 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 46,731 psi | 73% | 2936 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 34,185 psi | 54% | 2615 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 96% | 38,508 psi | 60% | 2740 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,369 psi | 43% | 1680 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,411 psi | 71% | 2785 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,692 psi | 81% | 2972 fps | 100% |
| ReloadSwiss RS 60 | 91 gr | 80% | 41,771 psi | 65% | 2838 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,925 psi | 55% | 2651 fps | 97.4% |
| ReloadSwiss RS 70 | 92.4 gr | 80% | 34,229 psi | 54% | 2657 fps | 96.7% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 38,058 psi | 60% | 2808 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 48,501 psi | 76% | 2799 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,061 psi | 66% | 2733 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 46,673 psi | 73% | 2831 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 90% | 40,582 psi | 64% | 2762 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 39,523 psi | 62% | 2654 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,493 psi | 60% | 2638 fps | 97.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,431 psi | 82% | 2881 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,789 psi | 73% | 2789 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 36,651 psi | 57% | 2615 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,439 psi | 68% | 2792 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,330 psi | 84% | 2910 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,908 psi | 80% | 2881 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,953 psi | 81% | 2782 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,772 psi | 69% | 2648 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,594 psi | 59% | 2579 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 40,190 psi | 63% | 2759 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 51,750 psi | 81% | 2782 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,011 psi | 83% | 2897 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,627 psi | 67% | 2736 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 51,387 psi | 81% | 2877 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 31,633 psi | 50% | 2585 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 38,624 psi | 61% | 2690 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 52,547 psi | 82% | 2766 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,689 psi | 76% | 2766 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,095 psi | 77% | 2779 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,625 psi | 64% | 2664 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,579 psi | 57% | 2631 fps | 98% |
| Vihtavuori N165 | <<locked>> | 94% | 40,625 psi | 64% | 2723 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 47,326 psi | 74% | 2772 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,013 psi | 56% | 2631 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 80% | 27,253 psi | 43% | 2461 fps | 95.3% |
| Vihtavuori N560 | <<locked>> | 96% | 47,834 psi | 75% | 2966 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,868 psi | 56% | 2602 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 37,449 psi | 59% | 2687 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 84% | 25,092 psi | 39% | 2467 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,879 psi | 80% | 2887 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,743 psi | 69% | 2789 fps | 95.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 105 powders for .378 Weath. Mag. loaded with the .376 | 250gr | Peregrine Plainsmaster (VLR-4). Alliant Reloder-26 delivers the highest muzzle velocity at 3,156 fps; across all powders the maximum-charge window runs from 1,834 fps to 3,156 fps. Accurate 3100 gives the best case fill at 100 %, and 105 of the 105 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.376" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. ReloadSwiss RS 60, ReloadSwiss RS 70, Alliant Reloder-16 rank at the top here: for .378 Weath. Mag. with the .376 | 250gr | Peregrine Plainsmaster (VLR-4) they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.