Load Specifications
Load data in caliber .378 Weath. Mag. with .375 | 270gr | Nosler CT FailSafe bullet and 93 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Ramshot Grand 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.
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>> | 82% | 57,087 psi | 89% | 2766 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,825 psi | 87% | 2805 fps | 99.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,565 psi | 89% | 2900 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 57,479 psi | 90% | 2825 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,911 psi | 86% | 2894 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 55,622 psi | 87% | 2995 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 86% | 57,261 psi | 90% | 2858 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,724 psi | 87% | 2940 fps | 99% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,145 psi | 90% | 2999 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 36,753 psi | 58% | 2654 fps | 96.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,971 psi | 89% | 2989 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,766 psi | 86% | 2831 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,868 psi | 86% | 2854 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,637 psi | 87% | 2946 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,000 psi | 89% | 2969 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,158 psi | 86% | 2930 fps | 99% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,231 psi | 88% | 2992 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,069 psi | 83% | 2910 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,093 psi | 72% | 2851 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 57,363 psi | 90% | 3061 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,459 psi | 81% | 2913 fps | 98.5% |
| Bofors RP3 | <<locked>> | 84% | 55,666 psi | 87% | 2851 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,231 psi | 88% | 2992 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 54,998 psi | 86% | 2841 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 84% | 55,985 psi | 88% | 2871 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,433 psi | 85% | 2910 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 90% | 54,969 psi | 86% | 2881 fps | 99.1% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 52,518 psi | 82% | 2864 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,072 psi | 88% | 2920 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,941 psi | 88% | 2867 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,624 psi | 90% | 2904 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,165 psi | 71% | 2894 fps | 98.1% |
| Hodgdon Superformance | <<locked>> | 90% | 57,232 psi | 90% | 2986 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,608 psi | 57% | 1772 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 56,811 psi | 89% | 2848 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,492 psi | 89% | 2815 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,217 psi | 88% | 2835 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 54,940 psi | 86% | 2818 fps | 99.6% |
| IMR 4350 | <<locked>> | 92% | 55,999 psi | 88% | 2877 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,536 psi | 89% | 2867 fps | 99.7% |
| IMR 4831 | <<locked>> | 96% | 56,260 psi | 88% | 2897 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,333 psi | 88% | 2881 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,056 psi | 86% | 2867 fps | 97.5% |
| IMR 7828 SSC | <<locked>> | 98% | 54,882 psi | 86% | 2976 fps | 98.1% |
| Lovex S062 | <<locked>> | 84% | 56,985 psi | 89% | 2831 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,753 psi | 89% | 2864 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 54,636 psi | 86% | 2854 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,992 psi | 74% | 2753 fps | 99.4% |
| Norma 203B | <<locked>> | 82% | 54,201 psi | 85% | 2841 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,927 psi | 89% | 2933 fps | 99% |
| Norma MRP | <<locked>> | 98% | 55,840 psi | 88% | 3015 fps | 99.8% |
| Norma URP | <<locked>> | 92% | 57,174 psi | 90% | 2930 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,955 psi | 86% | 2867 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,563 psi | 86% | 2979 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 92% | 55,898 psi | 88% | 2933 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,317 psi | 87% | 2959 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,318 psi | 58% | 1814 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,840 psi | 88% | 2854 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,391 psi | 88% | 2956 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,650 psi | 86% | 2913 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,884 psi | 89% | 2999 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,150 psi | 71% | 2887 fps | 99% |
| Rottweil R 902 | <<locked>> | 82% | 55,622 psi | 87% | 2795 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,898 psi | 88% | 2848 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,334 psi | 90% | 2907 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 96% | 54,433 psi | 85% | 2917 fps | 99% |
| Rottweil R 907 | <<locked>> | 88% | 54,998 psi | 86% | 2841 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,753 psi | 89% | 2864 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 56,985 psi | 89% | 2831 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,636 psi | 86% | 2854 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,363 psi | 90% | 2907 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,507 psi | 89% | 2723 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,391 psi | 88% | 2815 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 57,537 psi | 90% | 2966 fps | 99.3% |
| Somchem S355 | <<locked>> | 86% | 55,579 psi | 87% | 2841 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,419 psi | 87% | 2844 fps | 97.3% |
| Somchem S365 | <<locked>> | 94% | 56,565 psi | 89% | 2927 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,013 psi | 86% | 2890 fps | 99.4% |
| Unknown powder | <<locked>> | 90% | 57,667 psi | 90% | 2933 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 55,970 psi | 88% | 2749 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,173 psi | 88% | 2766 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,000 psi | 89% | 2815 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,608 psi | 87% | 2867 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,360 psi | 85% | 2864 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 82% | 54,346 psi | 85% | 2766 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,665 psi | 86% | 2874 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,796 psi | 87% | 2940 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,985 psi | 88% | 3009 fps | 97.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 47,906 psi | 75% | 2858 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,143 psi | 86% | 2831 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,433 psi | 85% | 2910 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,559 psi | 76% | 2982 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,956 psi | 89% | 2910 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 2495 | <<locked>> | 80% | 53,577 psi | 84% | 2720 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,832 psi | 72% | 2641 fps | 98% |
| Accurate 3100 | <<locked>> | 82% | 30,690 psi | 48% | 2408 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 50,807 psi | 80% | 2730 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,030 psi | 61% | 2618 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 98% | 51,808 psi | 81% | 2933 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 47,616 psi | 75% | 2710 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 40,263 psi | 63% | 2657 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 92% | 43,656 psi | 68% | 2756 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 98% | 34,490 psi | 54% | 2592 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,069 psi | 83% | 2930 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,385 psi | 76% | 2736 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,619 psi | 81% | 2805 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,768 psi | 59% | 2625 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,975 psi | 67% | 2746 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 39,987 psi | 63% | 2651 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 88% | 37,681 psi | 59% | 2644 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,818 psi | 44% | 2388 fps | 97.7% |
| Alliant Reloder-25 | <<locked>> | 86% | 29,617 psi | 46% | 2454 fps | 95.1% |
| Alliant Reloder-26 | 92.9 gr | 80% | 29,747 psi | 47% | 2500 fps | 96.3% |
| Bofors RP15 | <<locked>> | 92% | 39,769 psi | 62% | 2690 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 48,805 psi | 76% | 2746 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 37,681 psi | 59% | 2644 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 42,830 psi | 67% | 2628 fps | 97.5% |
| Hodgdon H380 | <<locked>> | 80% | 49,139 psi | 77% | 2762 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 44,440 psi | 70% | 2736 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 80% | 40,234 psi | 63% | 2608 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 96% | 46,209 psi | 72% | 2753 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 45,803 psi | 72% | 2746 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,433 psi | 56% | 2516 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,604 psi | 79% | 2802 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 37,260 psi | 58% | 2703 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 39,827 psi | 62% | 2677 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,340 psi | 43% | 1581 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,343 psi | 79% | 2753 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,098 psi | 83% | 2769 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,905 psi | 74% | 2687 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,890 psi | 72% | 2661 fps | 98.6% |
| IMR 4350 | <<locked>> | 80% | 38,406 psi | 60% | 2556 fps | 96.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,237 psi | 69% | 2657 fps | 98.2% |
| IMR 4831 | <<locked>> | 80% | 33,968 psi | 53% | 2490 fps | 98.2% |
| IMR 4895 | <<locked>> | 80% | 52,953 psi | 83% | 2831 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 45,745 psi | 72% | 2707 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 92% | 44,657 psi | 70% | 2789 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 50,401 psi | 79% | 2736 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,756 psi | 65% | 2608 fps | 98.8% |
| Lovex S070 | <<locked>> | 80% | 39,929 psi | 63% | 2589 fps | 97.5% |
| Lovex S071 | <<locked>> | 86% | 30,037 psi | 47% | 2392 fps | 95% |
| Norma 203B | <<locked>> | 80% | 50,952 psi | 80% | 2789 fps | 100% |
| Norma 204 | <<locked>> | 82% | 40,524 psi | 64% | 2641 fps | 95.7% |
| Norma MRP | 94.6 gr | 84% | 34,330 psi | 54% | 2592 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 38,624 psi | 61% | 2608 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 80% | 51,387 psi | 81% | 2812 fps | 100% |
| Ramshot Grand | 104.6 gr | 90% | 43,787 psi | 69% | 2782 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 37,492 psi | 59% | 2598 fps | 97.6% |
| Ramshot Magnum | <<locked>> | 90% | 37,869 psi | 59% | 2635 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,920 psi | 44% | 1621 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,037 psi | 77% | 2746 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,614 psi | 71% | 2795 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,711 psi | 61% | 2635 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,449 psi | 59% | 2644 fps | 98.6% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,156 psi | 54% | 2615 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 52,286 psi | 82% | 2746 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,934 psi | 72% | 2694 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,483 psi | 70% | 2690 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 86% | 39,102 psi | 61% | 2631 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 42,830 psi | 67% | 2628 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,756 psi | 65% | 2608 fps | 98.8% |
| Shooters World Precision | <<locked>> | 80% | 50,401 psi | 79% | 2736 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,929 psi | 63% | 2589 fps | 97.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,108 psi | 74% | 2749 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,036 psi | 74% | 2592 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,886 psi | 64% | 2552 fps | 97.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 38,769 psi | 61% | 2628 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 46,166 psi | 72% | 2694 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 45,440 psi | 71% | 2677 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 35,172 psi | 55% | 2569 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 34,838 psi | 55% | 2507 fps | 95.1% |
| Unknown powder | <<locked>> | 80% | 41,611 psi | 65% | 2664 fps | 99.2% |
| Vihtavuori N135 | <<locked>> | 80% | 52,663 psi | 83% | 2707 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,678 psi | 83% | 2720 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,048 psi | 69% | 2621 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,089 psi | 63% | 2608 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 88% | 36,550 psi | 57% | 2539 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 51,010 psi | 80% | 2720 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,537 psi | 62% | 2612 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 80% | 30,835 psi | 48% | 2464 fps | 97.8% |
| Vihtavuori N560 | <<locked>> | 92% | 45,701 psi | 72% | 2825 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 98% | 44,773 psi | 70% | 2799 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,160 psi | 61% | 2575 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,440 psi | 70% | 2736 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,584 psi | 39% | 2369 fps | 96.9% |
| Winchester Supreme 780 | <<locked>> | 86% | 39,827 psi | 62% | 2615 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 93 powders for .378 Weath. Mag. loaded with the .375 | 270gr | Nosler CT FailSafe. Alliant Reloder-26 delivers the highest muzzle velocity at 3,061 fps; across all powders the maximum-charge window runs from 1,772 fps to 3,061 fps. Accurate 3100 gives the best case fill at 100 %, and 93 of the 93 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 270.0 gr projectile in 0.375" calls for a 1:16.5 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. Alliant Reloder-26, Ramshot Grand, Norma MRP rank at the top here: for .378 Weath. Mag. with the .375 | 270gr | Nosler CT FailSafe 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.