Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:256 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 | 256gr | Peregrine VLR-5 bullet and 106 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 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% | 56,927 psi | 89% | 2848 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,100 psi | 86% | 2877 fps | 99% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,431 psi | 82% | 2917 fps | 99.7% |
| Accurate 4064 | <<locked>> | 86% | 57,319 psi | 90% | 2907 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,839 psi | 86% | 2972 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 53,882 psi | 84% | 3068 fps | 97.7% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 54,969 psi | 86% | 3068 fps | 96.6% |
| ADI AR 2206H | <<locked>> | 82% | 56,695 psi | 89% | 2943 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 54,491 psi | 85% | 2897 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,159 psi | 88% | 3022 fps | 98.6% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,708 psi | 84% | 3012 fps | 97.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 57,609 psi | 90% | 3081 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 56,217 psi | 88% | 3018 fps | 98.7% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 56,217 psi | 88% | 3018 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,114 psi | 86% | 2920 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,405 psi | 87% | 2943 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,854 psi | 88% | 3035 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 57,348 psi | 90% | 3058 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,376 psi | 87% | 3009 fps | 98.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,417 psi | 82% | 3009 fps | 98.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,472 psi | 78% | 2940 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,917 psi | 67% | 2861 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 57,246 psi | 90% | 3143 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,884 psi | 89% | 2966 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,921 psi | 75% | 2927 fps | 97.3% |
| Bofors RP3 | <<locked>> | 86% | 55,941 psi | 88% | 2936 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,417 psi | 82% | 3009 fps | 98.3% |
| Bofors RP7 | <<locked>> | 90% | 55,405 psi | 87% | 2923 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 86% | 56,449 psi | 88% | 2956 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 57,363 psi | 90% | 3031 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 90% | 57,000 psi | 89% | 2989 fps | 99% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 57,711 psi | 90% | 3015 fps | 97.3% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 56,463 psi | 88% | 2999 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 82% | 57,319 psi | 90% | 2949 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,043 psi | 88% | 2949 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,114 psi | 85% | 2936 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,003 psi | 66% | 2887 fps | 96.5% |
| Hodgdon Superformance | <<locked>> | 90% | 53,722 psi | 84% | 3009 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,172 psi | 57% | 1814 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,868 psi | 86% | 2900 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,406 psi | 90% | 2930 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,681 psi | 89% | 2920 fps | 99.5% |
| IMR 4350 | <<locked>> | 94% | 56,507 psi | 89% | 2959 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,174 psi | 90% | 2953 fps | 99.5% |
| IMR 4831 | <<locked>> | 94% | 55,361 psi | 87% | 2963 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 56,884 psi | 89% | 2969 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,579 psi | 87% | 2946 fps | 97.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,068 psi | 80% | 2979 fps | 96.7% |
| Lovex D073.6 | <<locked>> | 82% | 57,072 psi | 89% | 2910 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,535 psi | 87% | 2864 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,450 psi | 90% | 2920 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,072 psi | 89% | 2946 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 54,911 psi | 86% | 2936 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,352 psi | 68% | 2762 fps | 98.5% |
| Norma 201 | <<locked>> | 82% | 55,245 psi | 87% | 2881 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,115 psi | 88% | 2877 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,694 psi | 86% | 2927 fps | 100% |
| Norma 204 | <<locked>> | 94% | 57,348 psi | 90% | 3015 fps | 98.7% |
| Norma MRPᴾ | <<locked>> | 100% | 55,753 psi | 87% | 3094 fps | 99.6% |
| Norma URP | <<locked>> | 94% | 57,261 psi | 90% | 3012 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,506 psi | 87% | 2956 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,329 psi | 80% | 2995 fps | 97.1% |
| Ramshot Hunter | <<locked>> | 94% | 56,072 psi | 88% | 3015 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,542 psi | 71% | 2864 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,782 psi | 58% | 1860 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,420 psi | 88% | 2940 fps | 99.8% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,478 psi | 89% | 3012 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 56,797 psi | 89% | 3048 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,723 psi | 86% | 2995 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 57,392 psi | 90% | 3087 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 41,916 psi | 66% | 2881 fps | 97.6% |
| Rottweil R 902 | <<locked>> | 84% | 55,898 psi | 88% | 2881 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,956 psi | 88% | 2930 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,201 psi | 85% | 2933 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 98% | 54,404 psi | 85% | 2989 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 90% | 55,405 psi | 87% | 2923 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,072 psi | 89% | 2946 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,072 psi | 89% | 2910 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,450 psi | 90% | 2920 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,911 psi | 86% | 2936 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,143 psi | 85% | 2940 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,187 psi | 86% | 2913 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,246 psi | 88% | 2808 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,130 psi | 90% | 2812 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,942 psi | 89% | 2900 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 53,925 psi | 85% | 2986 fps | 98.5% |
| Somchem S335 | <<locked>> | 82% | 55,869 psi | 88% | 2808 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,854 psi | 88% | 2927 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,028 psi | 88% | 2927 fps | 96.9% |
| Somchem S365 | <<locked>> | 96% | 56,536 psi | 89% | 3009 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,027 psi | 86% | 2966 fps | 99.2% |
| Vihtavuori N133 | <<locked>> | 82% | 56,811 psi | 89% | 2789 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,304 psi | 88% | 2838 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,739 psi | 89% | 2854 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,363 psi | 90% | 2897 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,927 psi | 88% | 2953 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,821 psi | 80% | 2884 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 84% | 54,926 psi | 86% | 2854 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,824 psi | 86% | 2956 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,288 psi | 87% | 3015 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,115 psi | 88% | 3084 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,564 psi | 87% | 2917 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,537 psi | 90% | 3031 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,556 psi | 70% | 2999 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,259 psi | 87% | 2920 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,448 psi | 87% | 2963 fps | 98.5% |
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% | 49,951 psi | 78% | 2753 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,254 psi | 76% | 2766 fps | 97.9% |
| Accurate 3100 | <<locked>> | 86% | 32,082 psi | 50% | 2516 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 47,355 psi | 74% | 2762 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,795 psi | 56% | 2621 fps | 98.2% |
| Accurate High Country | <<locked>> | 92% | 43,424 psi | 68% | 2874 fps | 95.1% |
| Accurate MAGPRO | <<locked>> | 98% | 51,082 psi | 80% | 3002 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 53,127 psi | 83% | 2890 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,165 psi | 71% | 2743 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 88% | 40,263 psi | 63% | 2723 fps | 95% |
| ADI AR 2213 | <<locked>> | 96% | 46,833 psi | 73% | 2887 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,922 psi | 78% | 2963 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 40,292 psi | 63% | 2723 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 40,292 psi | 63% | 2723 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,469 psi | 71% | 2766 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,602 psi | 76% | 2835 fps | 100% |
| Alliant Reloder-16 | 84.5 gr | 80% | 35,360 psi | 55% | 2638 fps | 98.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,074 psi | 63% | 2766 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 88% | 39,856 psi | 62% | 2717 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 92% | 39,885 psi | 63% | 2762 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,614 psi | 40% | 2382 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 90% | 31,111 psi | 49% | 2559 fps | 95.1% |
| Alliant Reloder-26 | 95.6 gr | 82% | 29,211 psi | 46% | 2549 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,069 psi | 83% | 2907 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 42,119 psi | 66% | 2812 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 45,658 psi | 72% | 2772 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 39,885 psi | 63% | 2762 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 40,219 psi | 63% | 2644 fps | 96.2% |
| Hodgdon H380 | <<locked>> | 80% | 46,093 psi | 72% | 2785 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 80% | 38,087 psi | 60% | 2674 fps | 96.3% |
| Hodgdon H4350 | <<locked>> | 80% | 41,162 psi | 65% | 2700 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 96% | 50,285 psi | 79% | 2897 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 49,197 psi | 77% | 2877 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 53,708 psi | 84% | 2897 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,750 psi | 51% | 2526 fps | 98.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,488 psi | 79% | 2881 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 39,334 psi | 62% | 2818 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 37,101 psi | 58% | 2684 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,963 psi | 42% | 1624 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,576 psi | 81% | 2851 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,514 psi | 74% | 2776 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,850 psi | 78% | 2805 fps | 98.8% |
| IMR 4350 | <<locked>> | 82% | 38,421 psi | 60% | 2625 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,785 psi | 65% | 2677 fps | 97.1% |
| IMR 4831 | <<locked>> | 80% | 34,664 psi | 54% | 2579 fps | 97.9% |
| IMR 4895 | <<locked>> | 80% | 49,850 psi | 78% | 2861 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 48,950 psi | 77% | 2835 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 98% | 47,688 psi | 75% | 2917 fps | 95.8% |
| Lovex D073.6 | <<locked>> | 80% | 53,403 psi | 84% | 2861 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,243 psi | 82% | 2815 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,601 psi | 75% | 2772 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,189 psi | 61% | 2628 fps | 97.8% |
| Lovex S070 | <<locked>> | 80% | 37,333 psi | 59% | 2605 fps | 96.2% |
| Lovex S071 | <<locked>> | 92% | 33,257 psi | 52% | 2543 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 51,895 psi | 81% | 2831 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,562 psi | 82% | 2828 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,950 psi | 75% | 2822 fps | 100% |
| Norma 204 | <<locked>> | 84% | 40,582 psi | 64% | 2710 fps | 95% |
| Norma MRP | <<locked>> | 88% | 36,550 psi | 57% | 2717 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 35,955 psi | 56% | 2621 fps | 98.1% |
| Ramshot Big Game | <<locked>> | 80% | 48,399 psi | 76% | 2844 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 44,353 psi | 70% | 2861 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 34,896 psi | 55% | 2608 fps | 96.1% |
| Ramshot Magnum | <<locked>> | 96% | 39,378 psi | 62% | 2736 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,470 psi | 43% | 1663 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,209 psi | 72% | 2769 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,721 psi | 83% | 2956 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,656 psi | 67% | 2822 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,737 psi | 56% | 2641 fps | 97.9% |
| ReloadSwiss RS 70 | 92.4 gr | 80% | 34,911 psi | 55% | 2648 fps | 97.3% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 36,274 psi | 57% | 2736 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 49,313 psi | 77% | 2782 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,888 psi | 67% | 2720 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 44,599 psi | 70% | 2759 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 90% | 41,466 psi | 65% | 2756 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 40,219 psi | 63% | 2644 fps | 96.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,189 psi | 61% | 2628 fps | 97.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,403 psi | 84% | 2861 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,601 psi | 75% | 2772 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,333 psi | 59% | 2605 fps | 96.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,280 psi | 69% | 2776 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,764 psi | 81% | 2861 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,736 psi | 83% | 2762 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,498 psi | 70% | 2628 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,276 psi | 60% | 2566 fps | 96.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 41,075 psi | 64% | 2749 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 52,533 psi | 82% | 2759 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,410 psi | 68% | 2720 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 48,979 psi | 77% | 2812 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 32,372 psi | 51% | 2575 fps | 99.6% |
| Somchem S385 | <<locked>> | 86% | 36,869 psi | 58% | 2625 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 53,345 psi | 84% | 2746 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,559 psi | 78% | 2743 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,922 psi | 78% | 2759 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,394 psi | 65% | 2648 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,318 psi | 58% | 2621 fps | 98.4% |
| Vihtavuori N165 | <<locked>> | 92% | 38,856 psi | 61% | 2657 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 48,138 psi | 75% | 2753 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,753 psi | 58% | 2621 fps | 98.1% |
| Vihtavuori N555 | <<locked>> | 80% | 27,963 psi | 44% | 2457 fps | 96% |
| Vihtavuori N560 | <<locked>> | 96% | 48,878 psi | 77% | 2956 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,550 psi | 57% | 2592 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 38,232 psi | 60% | 2677 fps | 96.3% |
| Winchester StaBALL HD | <<locked>> | 82% | 23,975 psi | 38% | 2398 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,779 psi | 81% | 2867 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 41,655 psi | 65% | 2723 fps | 95.6% |
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 106 powders for .378 Weath. Mag. loaded with the .376 | 256gr | Peregrine VLR-5. Alliant Reloder-26 delivers the highest muzzle velocity at 3,143 fps; across all powders the maximum-charge window runs from 1,814 fps to 3,143 fps. Accurate 3100 gives the best case fill at 100 %, and 106 of the 106 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 256.0 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 70, Alliant Reloder-26, Alliant Reloder-16 rank at the top here: for .378 Weath. Mag. with the .376 | 256gr | Peregrine VLR-5 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.