Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:236 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:1:17.0
Load data in caliber .378 Weath. Mag. with .376 | 236gr | Peregrine VLR-5 bullet and 108 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-17 and ReloadSwiss RS 60.
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% | 54,563 psi | 86% | 2936 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,739 psi | 89% | 3015 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,835 psi | 78% | 2986 fps | 99% |
| Accurate 4064 | <<locked>> | 86% | 54,882 psi | 86% | 2992 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,811 psi | 87% | 3104 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 54,882 psi | 86% | 3196 fps | 97.1% |
| ADI AR 2206H | <<locked>> | 82% | 54,621 psi | 86% | 3031 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,811 psi | 87% | 3035 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 57,464 psi | 90% | 3153 fps | 98.2% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,884 psi | 89% | 3025 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 54,984 psi | 86% | 3163 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 57,377 psi | 90% | 3146 fps | 98.3% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 57,377 psi | 90% | 3146 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 56,362 psi | 88% | 3058 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,768 psi | 89% | 3084 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 56,913 psi | 89% | 3166 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 54,505 psi | 85% | 3140 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 56,521 psi | 89% | 3136 fps | 98.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 49,893 psi | 78% | 3071 fps | 97.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,949 psi | 74% | 3009 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,959 psi | 64% | 2913 fps | 98.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,027 psi | 85% | 3212 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 54,650 psi | 86% | 3048 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 45,672 psi | 72% | 2989 fps | 95.9% |
| Bofors RP3 | <<locked>> | 88% | 57,276 psi | 90% | 3074 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 49,893 psi | 78% | 3071 fps | 97.2% |
| Bofors RP7 | <<locked>> | 92% | 56,681 psi | 89% | 3054 fps | 98.8% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,855 psi | 89% | 3058 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 54,201 psi | 85% | 3038 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 54,781 psi | 86% | 3104 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 90% | 54,810 psi | 86% | 3061 fps | 98.1% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 55,201 psi | 87% | 3084 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 82% | 55,259 psi | 87% | 3041 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 57,043 psi | 89% | 3081 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 55,405 psi | 87% | 3077 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,129 psi | 86% | 3143 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,056 psi | 56% | 1896 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 56,449 psi | 88% | 3045 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,695 psi | 87% | 3015 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,274 psi | 87% | 3018 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 54,679 psi | 86% | 2999 fps | 98.9% |
| IMR 4350 | <<locked>> | 94% | 54,230 psi | 85% | 3035 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,071 psi | 86% | 3031 fps | 98.9% |
| IMR 4831 | <<locked>> | 96% | 56,449 psi | 88% | 3097 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 54,621 psi | 86% | 3058 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 56,942 psi | 89% | 3074 fps | 96.5% |
| IMR 8208 XBR | <<locked>> | 82% | 56,884 psi | 89% | 3025 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 54,679 psi | 86% | 2999 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,130 psi | 90% | 3005 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,274 psi | 87% | 3009 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,853 psi | 86% | 3025 fps | 99.6% |
| Lovex S070 | <<locked>> | 94% | 56,086 psi | 88% | 3068 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,133 psi | 64% | 2822 fps | 97.4% |
| Norma 201 | <<locked>> | 84% | 56,695 psi | 89% | 3022 fps | 100% |
| Norma 202 | <<locked>> | 84% | 57,551 psi | 90% | 3018 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,985 psi | 88% | 3068 fps | 100% |
| Norma 204 | <<locked>> | 94% | 54,897 psi | 86% | 3087 fps | 97.7% |
| Norma MRPᴾ | <<locked>> | 100% | 53,011 psi | 83% | 3163 fps | 98.9% |
| Norma URP | <<locked>> | 94% | 54,737 psi | 86% | 3091 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 57,014 psi | 89% | 3097 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 57,334 psi | 90% | 3146 fps | 99.7% |
| Ramshot TAC | <<locked>> | 82% | 57,145 psi | 90% | 3054 fps | 99.8% |
| Ramshot Wild Boar | <<locked>> | 82% | 57,203 psi | 90% | 3071 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,608 psi | 57% | 1939 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 54,201 psi | 85% | 3018 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 53,940 psi | 85% | 3097 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,070 psi | 85% | 3133 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,869 psi | 88% | 3130 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 54,679 psi | 86% | 3163 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 57,145 psi | 90% | 2992 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 57,305 psi | 90% | 3022 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 57,145 psi | 90% | 3068 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 55,419 psi | 87% | 3061 fps | 96.8% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 55,477 psi | 87% | 3120 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 92% | 56,681 psi | 89% | 3054 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,853 psi | 86% | 3025 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,679 psi | 86% | 2999 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,274 psi | 87% | 3009 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,086 psi | 88% | 3068 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 55,434 psi | 87% | 3077 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,840 psi | 88% | 3035 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,666 psi | 89% | 3054 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 57,711 psi | 90% | 2949 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,114 psi | 86% | 2900 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,679 psi | 86% | 2972 fps | 98.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,984 psi | 86% | 3114 fps | 98% |
| Somchem S335 | <<locked>> | 84% | 57,334 psi | 90% | 2946 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,593 psi | 87% | 3022 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 57,261 psi | 90% | 3064 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 57,421 psi | 90% | 3051 fps | 96.4% |
| Somchem S365 | <<locked>> | 98% | 57,566 psi | 90% | 3143 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 56,260 psi | 88% | 3094 fps | 98.8% |
| Vihtavuori N133 | <<locked>> | 82% | 54,752 psi | 86% | 2881 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 57,551 psi | 90% | 2976 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 54,636 psi | 86% | 2946 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,056 psi | 86% | 2986 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 57,014 psi | 89% | 3084 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,486 psi | 76% | 2946 fps | 97.2% |
| Vihtavuori N530 | <<locked>> | 82% | 57,435 psi | 90% | 3025 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 56,362 psi | 88% | 2992 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 56,072 psi | 88% | 3091 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,446 psi | 82% | 3091 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 53,534 psi | 84% | 3146 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 57,000 psi | 89% | 3051 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,940 psi | 86% | 3107 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,250 psi | 66% | 3058 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,797 psi | 89% | 3061 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 52,866 psi | 83% | 3028 fps | 97.4% |
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% | 47,659 psi | 75% | 2838 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,427 psi | 73% | 2835 fps | 96.8% |
| Accurate 3100 | <<locked>> | 90% | 34,940 psi | 55% | 2680 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 45,165 psi | 71% | 2841 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,026 psi | 53% | 2677 fps | 96.9% |
| Accurate High Country | <<locked>> | 96% | 47,485 psi | 74% | 3061 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 51,271 psi | 80% | 2976 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,511 psi | 68% | 2818 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 92% | 44,019 psi | 69% | 2907 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 53,388 psi | 84% | 2972 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,601 psi | 75% | 3035 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 43,947 psi | 69% | 2904 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 43,947 psi | 69% | 2904 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,598 psi | 68% | 2841 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,746 psi | 73% | 2913 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,837 psi | 53% | 2697 fps | 97.1% |
| Alliant Reloder-17 | 92.8 gr | 80% | 38,174 psi | 60% | 2831 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 92% | 43,366 psi | 68% | 2894 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 96% | 43,497 psi | 68% | 2943 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,789 psi | 44% | 2543 fps | 96.1% |
| Alliant Reloder-25 | <<locked>> | 94% | 33,736 psi | 53% | 2726 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 86% | 31,981 psi | 50% | 2726 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,010 psi | 80% | 2986 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 42,757 psi | 67% | 2927 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 43,555 psi | 68% | 2848 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 43,497 psi | 68% | 2943 fps | 95.4% |
| Bofors RP7 | <<locked>> | 82% | 41,249 psi | 65% | 2769 fps | 95.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,997 psi | 83% | 2999 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,208 psi | 69% | 2858 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 82% | 38,870 psi | 61% | 2795 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 82% | 42,192 psi | 66% | 2822 fps | 95.1% |
| Hodgdon H4831 | <<locked>> | 98% | 51,430 psi | 81% | 3018 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 51,808 psi | 81% | 2986 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,198 psi | 49% | 2585 fps | 97.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,312 psi | 76% | 2963 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 41,002 psi | 64% | 2871 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,803 psi | 42% | 1693 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,617 psi | 78% | 2933 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,185 psi | 82% | 2966 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,730 psi | 72% | 2854 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,022 psi | 75% | 2881 fps | 97.9% |
| IMR 4350 | <<locked>> | 84% | 39,349 psi | 62% | 2746 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,205 psi | 63% | 2746 fps | 95.8% |
| IMR 4831 | <<locked>> | 80% | 32,938 psi | 52% | 2635 fps | 96.6% |
| IMR 4895 | <<locked>> | 80% | 47,964 psi | 75% | 2943 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 50,082 psi | 78% | 2959 fps | 95% |
| IMR 8208 XBR | <<locked>> | 80% | 53,388 psi | 84% | 2972 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 51,169 psi | 80% | 2946 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,517 psi | 79% | 2900 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,759 psi | 72% | 2851 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,507 psi | 59% | 2687 fps | 96.6% |
| Lovex S070 | <<locked>> | 82% | 38,159 psi | 60% | 2723 fps | 95.6% |
| Lovex S071 | <<locked>> | 96% | 35,984 psi | 56% | 2707 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 49,850 psi | 78% | 2913 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,560 psi | 79% | 2913 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,079 psi | 72% | 2900 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 44,614 psi | 70% | 2897 fps | 95.3% |
| Norma MRP | <<locked>> | 92% | 39,813 psi | 62% | 2894 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 34,214 psi | 54% | 2680 fps | 96.8% |
| Ramshot Big Game | <<locked>> | 80% | 46,238 psi | 72% | 2920 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 35,549 psi | 56% | 2720 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 53,432 psi | 84% | 2995 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 53,374 psi | 84% | 3012 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,238 psi | 43% | 1736 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,382 psi | 70% | 2838 fps | 97.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,241 psi | 79% | 3035 fps | 100% |
| ReloadSwiss RS 60 | 92.8 gr | 80% | 40,640 psi | 64% | 2894 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,852 psi | 53% | 2694 fps | 96.5% |
| ReloadSwiss RS 70 | 94.2 gr | 80% | 33,286 psi | 52% | 2700 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 53,795 psi | 84% | 2943 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,485 psi | 74% | 2864 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,959 psi | 64% | 2789 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 94% | 48,718 psi | 76% | 2943 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 92% | 42,337 psi | 66% | 2877 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 82% | 41,249 psi | 65% | 2769 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,507 psi | 59% | 2687 fps | 96.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,169 psi | 80% | 2946 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,759 psi | 72% | 2851 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 38,159 psi | 60% | 2723 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,221 psi | 66% | 2848 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,025 psi | 82% | 2972 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,661 psi | 78% | 2943 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,053 psi | 80% | 2851 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,917 psi | 67% | 2713 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,305 psi | 62% | 2687 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 44,788 psi | 70% | 2930 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 50,589 psi | 79% | 2848 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,880 psi | 81% | 2963 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,452 psi | 65% | 2792 fps | 99.7% |
| Somchem S361 | <<locked>> | 96% | 53,722 psi | 84% | 2992 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 30,676 psi | 48% | 2631 fps | 98.8% |
| Somchem S385 | <<locked>> | 90% | 40,132 psi | 63% | 2795 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 51,605 psi | 81% | 2838 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,659 psi | 75% | 2831 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,993 psi | 75% | 2844 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,624 psi | 62% | 2720 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 35,650 psi | 56% | 2684 fps | 97.2% |
| Vihtavuori N165 | <<locked>> | 96% | 42,206 psi | 66% | 2828 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 53,664 psi | 84% | 2972 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 46,311 psi | 73% | 2838 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,085 psi | 55% | 2680 fps | 96.8% |
| Vihtavuori N555 | <<locked>> | 82% | 28,297 psi | 44% | 2559 fps | 95.1% |
| Vihtavuori N560 | <<locked>> | 98% | 49,937 psi | 78% | 3084 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,041 psi | 55% | 2654 fps | 99% |
| Winchester 760 | <<locked>> | 82% | 38,986 psi | 61% | 2795 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,107 psi | 41% | 2566 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,661 psi | 78% | 2949 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 45,818 psi | 72% | 2904 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 108 powders for .378 Weath. Mag. loaded with the .376 | 236gr | Peregrine VLR-5. Alliant Reloder-26 delivers the highest muzzle velocity at 3,212 fps; across all powders the maximum-charge window runs from 1,896 fps to 3,212 fps. Accurate 3100 gives the best case fill at 100 %, and 108 of the 108 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 236.0 gr projectile in 0.376" calls for a 1:17.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, ADI AR 2209 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-17, ReloadSwiss RS 60 rank at the top here: for .378 Weath. Mag. with the .376 | 236gr | 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.