Load Specifications
Load data in caliber .378 Weath. Mag. with .375 | 270gr | Woodleigh PP SN bullet and 85 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Alliant Reloder-26 and Norma MRP.
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.
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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 2700 | <<locked>> | 82% | 57,392 psi | 90% | 2864 fps | 99.7% |
| Accurate 3100 | <<locked>> | 98% | 56,985 psi | 89% | 2923 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 57,435 psi | 90% | 2838 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 54,984 psi | 86% | 2910 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 55,506 psi | 87% | 3022 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 84% | 56,811 psi | 89% | 2874 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 55,695 psi | 87% | 2959 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 98% | 57,087 psi | 89% | 3022 fps | 98.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 44,686 psi | 70% | 2789 fps | 96.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,508 psi | 62% | 2746 fps | 98.1% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 55,956 psi | 88% | 2959 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 55,956 psi | 88% | 2959 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 54,549 psi | 85% | 2844 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 55,753 psi | 87% | 2966 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,145 psi | 90% | 2986 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,230 psi | 87% | 2949 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 98% | 56,637 psi | 89% | 3015 fps | 99.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 57,537 psi | 90% | 2982 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,777 psi | 78% | 2933 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 54,027 psi | 85% | 3022 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 55,622 psi | 87% | 2999 fps | 99.3% |
| Bofors RP3 | <<locked>> | 82% | 55,506 psi | 87% | 2864 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 45,687 psi | 72% | 2861 fps | 97.2% |
| Bofors RP5 | <<locked>> | 98% | 56,637 psi | 89% | 3015 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 54,563 psi | 86% | 2858 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,081 psi | 77% | 2877 fps | 98.1% |
| Hodgdon H380 | <<locked>> | 82% | 55,579 psi | 87% | 2881 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 56,971 psi | 89% | 2966 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 86% | 56,246 psi | 88% | 2923 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 96% | 57,261 psi | 90% | 2959 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,057 psi | 88% | 2940 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,159 psi | 88% | 2887 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,704 psi | 76% | 2986 fps | 99.2% |
| Hodgdon Superformance | <<locked>> | 88% | 57,363 psi | 90% | 3005 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,782 psi | 58% | 1801 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,318 psi | 88% | 2854 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,883 psi | 88% | 2897 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,985 psi | 88% | 2881 fps | 99.8% |
| IMR 4831 | <<locked>> | 90% | 55,506 psi | 87% | 2900 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 54,868 psi | 86% | 2887 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 98% | 54,723 psi | 86% | 2995 fps | 98.4% |
| Lovex S062 | <<locked>> | 82% | 56,695 psi | 89% | 2844 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,420 psi | 88% | 2881 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 54,505 psi | 85% | 2874 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,821 psi | 80% | 2831 fps | 99.9% |
| Norma 203B | <<locked>> | 82% | 57,377 psi | 90% | 2904 fps | 100% |
| Norma 204 | <<locked>> | 90% | 56,768 psi | 89% | 2953 fps | 99.2% |
| Norma MRP | <<locked>> | 96% | 56,492 psi | 89% | 3041 fps | 99.9% |
| Norma URP | <<locked>> | 90% | 57,174 psi | 90% | 2946 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,288 psi | 87% | 3015 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 90% | 55,970 psi | 88% | 2949 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,403 psi | 84% | 2949 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,608 psi | 59% | 1844 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,303 psi | 87% | 2867 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 56,652 psi | 89% | 2972 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 54,984 psi | 86% | 2933 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 57,101 psi | 89% | 3022 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,052 psi | 77% | 2986 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 84% | 55,695 psi | 87% | 2861 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 57,290 psi | 90% | 2930 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 94% | 54,621 psi | 86% | 2936 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 86% | 54,563 psi | 86% | 2858 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,420 psi | 88% | 2881 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 56,695 psi | 89% | 2844 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 54,505 psi | 85% | 2874 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,159 psi | 90% | 2920 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,970 psi | 88% | 2733 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,854 psi | 88% | 2831 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,172 psi | 85% | 2933 fps | 99.2% |
| Somchem S355 | <<locked>> | 84% | 55,361 psi | 87% | 2854 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,274 psi | 87% | 2867 fps | 97.7% |
| Somchem S365 | <<locked>> | 92% | 57,246 psi | 90% | 2946 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,274 psi | 87% | 2913 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 86% | 56,724 psi | 89% | 2828 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,492 psi | 87% | 2887 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 54,607 psi | 86% | 2887 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 82% | 57,334 psi | 90% | 2825 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 54,621 psi | 86% | 2890 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,478 psi | 89% | 2963 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 56,478 psi | 89% | 3035 fps | 98.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,098 psi | 82% | 2946 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 54,969 psi | 86% | 2844 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,159 psi | 90% | 2969 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 54,331 psi | 85% | 3071 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,158 psi | 86% | 2904 fps | 99.1% |
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 2700 | <<locked>> | 80% | 53,780 psi | 84% | 2808 fps | 99.4% |
| Accurate 3100 | <<locked>> | 80% | 30,995 psi | 49% | 2428 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 53,867 psi | 84% | 2789 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,872 psi | 66% | 2687 fps | 99.7% |
| Accurate MAGPRO | 109.9 gr | 90% | 44,788 psi | 70% | 2828 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 50,198 psi | 79% | 2772 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 37,579 psi | 59% | 2612 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 90% | 43,772 psi | 69% | 2779 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 98% | 41,785 psi | 65% | 2726 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 94% | 32,692 psi | 51% | 2562 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 37,826 psi | 59% | 2615 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 37,826 psi | 59% | 2615 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,155 psi | 80% | 2795 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,277 psi | 63% | 2694 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,151 psi | 72% | 2815 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 37,463 psi | 59% | 2608 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 86% | 37,913 psi | 59% | 2664 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,820 psi | 47% | 2461 fps | 98.8% |
| Alliant Reloder-25 | <<locked>> | 84% | 29,747 psi | 47% | 2474 fps | 95.8% |
| Alliant Reloder-26 | 98.8 gr | 80% | 32,155 psi | 50% | 2582 fps | 97.8% |
| Bofors RP15 | <<locked>> | 88% | 37,565 psi | 59% | 2654 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 51,866 psi | 81% | 2812 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 39,914 psi | 63% | 2743 fps | 95.5% |
| Bofors RP5 | <<locked>> | 86% | 37,913 psi | 59% | 2664 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 45,208 psi | 71% | 2694 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 94% | 40,147 psi | 63% | 2694 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 51,982 psi | 81% | 2828 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 43,642 psi | 68% | 2736 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 80% | 46,369 psi | 73% | 2753 fps | 98% |
| Hodgdon H4831 | <<locked>> | 88% | 43,743 psi | 69% | 2726 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 90% | 45,919 psi | 72% | 2766 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,913 psi | 59% | 2582 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 37,536 psi | 59% | 2733 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 42,699 psi | 67% | 2753 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,572 psi | 43% | 1611 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,837 psi | 83% | 2802 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,727 psi | 64% | 2625 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,543 psi | 73% | 2723 fps | 98.9% |
| IMR 4831 | <<locked>> | 80% | 40,016 psi | 63% | 2635 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 86% | 42,801 psi | 67% | 2667 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 90% | 41,916 psi | 66% | 2753 fps | 95.3% |
| Lovex S062 | <<locked>> | 80% | 53,214 psi | 83% | 2795 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,121 psi | 69% | 2671 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 42,409 psi | 66% | 2657 fps | 98.4% |
| Lovex S071 | <<locked>> | 84% | 30,472 psi | 48% | 2415 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 53,867 psi | 84% | 2851 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,393 psi | 63% | 2657 fps | 96.1% |
| Norma MRP | 98.3 gr | 82% | 34,577 psi | 54% | 2612 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 41,307 psi | 65% | 2677 fps | 99.6% |
| Ramshot Grand | <<locked>> | 90% | 41,582 psi | 65% | 2759 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 40,103 psi | 63% | 2671 fps | 98.5% |
| Ramshot Magnum | <<locked>> | 88% | 34,461 psi | 54% | 2572 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,152 psi | 44% | 1650 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,793 psi | 81% | 2815 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,008 psi | 77% | 2861 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,655 psi | 65% | 2707 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,074 psi | 63% | 2720 fps | 99.4% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 34,432 psi | 54% | 2648 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 48,878 psi | 77% | 2759 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 41,698 psi | 65% | 2654 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 82% | 36,680 psi | 57% | 2592 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 45,208 psi | 71% | 2694 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,121 psi | 69% | 2671 fps | 99.4% |
| Shooters World Precision | <<locked>> | 80% | 53,214 psi | 83% | 2795 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,409 psi | 66% | 2657 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,053 psi | 78% | 2815 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,458 psi | 78% | 2644 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,163 psi | 68% | 2618 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 36,347 psi | 57% | 2589 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 48,892 psi | 77% | 2756 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 45,368 psi | 71% | 2697 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 37,985 psi | 60% | 2635 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,925 psi | 55% | 2523 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 46,746 psi | 73% | 2680 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,714 psi | 67% | 2674 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 36,767 psi | 58% | 2559 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 53,737 psi | 84% | 2776 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,134 psi | 66% | 2677 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 33,359 psi | 52% | 2536 fps | 98.7% |
| Vihtavuori N560 | <<locked>> | 88% | 42,917 psi | 67% | 2785 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 94% | 42,569 psi | 67% | 2769 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,669 psi | 65% | 2638 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,758 psi | 69% | 2740 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,411 psi | 41% | 2454 fps | 98.6% |
| Winchester Supreme 780 | <<locked>> | 86% | 39,088 psi | 61% | 2615 fps | 95.9% |
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 85 powders for .378 Weath. Mag. loaded with the .375 | 270gr | Woodleigh PP SN. Winchester StaBALL HD delivers the highest muzzle velocity at 3,071 fps; across all powders the maximum-charge window runs from 1,801 fps to 3,071 fps. ADI AR 2217 gives the best case fill at 100 %, and 85 of the 85 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 270.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-23 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. Accurate MAGPRO, Alliant Reloder-26, Norma MRP rank at the top here: for .378 Weath. Mag. with the .375 | 270gr | Woodleigh PP SN 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.