Load Specifications
Load data in caliber .378 Weath. Mag. with .375 | 300gr | Nosler AccuBond bullet and 89 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 IMR 7828 SSC.
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>> | 84% | 54,998 psi | 86% | 2657 fps | 99.7% |
| Accurate 3100 | <<locked>> | 98% | 56,463 psi | 88% | 2756 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 57,261 psi | 90% | 2667 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 54,781 psi | 86% | 2743 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 55,709 psi | 87% | 2858 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 84% | 56,710 psi | 89% | 2703 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 55,477 psi | 87% | 2795 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 98% | 56,811 psi | 89% | 2854 fps | 99.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 44,309 psi | 69% | 2635 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,204 psi | 61% | 2598 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 54,418 psi | 85% | 2677 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 55,477 psi | 87% | 2792 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 56,739 psi | 89% | 2808 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 54,882 psi | 86% | 2782 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 98% | 56,333 psi | 88% | 2848 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 57,188 psi | 90% | 2815 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,400 psi | 77% | 2769 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 57,595 psi | 90% | 2910 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 55,535 psi | 87% | 2759 fps | 96.2% |
| Bofors RP15ᴾ | <<locked>> | 100% | 55,114 psi | 86% | 2831 fps | 99.6% |
| Bofors RP3 | <<locked>> | 82% | 55,245 psi | 87% | 2694 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 45,382 psi | 71% | 2707 fps | 97.8% |
| Bofors RP5 | <<locked>> | 98% | 56,333 psi | 88% | 2848 fps | 99.7% |
| Bofors RP7 | <<locked>> | 86% | 54,360 psi | 85% | 2690 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,498 psi | 71% | 2661 fps | 97.9% |
| Hodgdon H380 | <<locked>> | 82% | 55,463 psi | 87% | 2713 fps | 100% |
| Hodgdon H414 | <<locked>> | 84% | 54,099 psi | 85% | 2759 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 88% | 54,607 psi | 86% | 2730 fps | 99.6% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 56,028 psi | 88% | 2782 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 96% | 55,695 psi | 87% | 2776 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,941 psi | 88% | 2717 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,246 psi | 90% | 2746 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,341 psi | 76% | 2825 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 88% | 57,029 psi | 89% | 2835 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,796 psi | 58% | 1677 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,289 psi | 88% | 2690 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,738 psi | 87% | 2677 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 57,595 psi | 90% | 2713 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,593 psi | 87% | 2730 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,883 psi | 88% | 2713 fps | 99.9% |
| IMR 4831 | <<locked>> | 94% | 56,173 psi | 88% | 2746 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 54,679 psi | 86% | 2726 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 96% | 54,694 psi | 86% | 2835 fps | 98.9% |
| Lovex S062 | <<locked>> | 82% | 56,507 psi | 89% | 2674 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,289 psi | 88% | 2710 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 54,331 psi | 85% | 2707 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,401 psi | 79% | 2671 fps | 100% |
| Norma 203B | <<locked>> | 82% | 57,319 psi | 90% | 2733 fps | 100% |
| Norma 204 | <<locked>> | 90% | 56,449 psi | 88% | 2782 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 34,824 psi | 55% | 2530 fps | 96.7% |
| Norma MRP | <<locked>> | 96% | 55,927 psi | 88% | 2871 fps | 100% |
| Norma URP | <<locked>> | 90% | 56,971 psi | 89% | 2776 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 54,418 psi | 85% | 2838 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 90% | 55,666 psi | 87% | 2785 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 55,201 psi | 87% | 2818 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,579 psi | 59% | 1716 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,187 psi | 86% | 2703 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 56,231 psi | 88% | 2795 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 54,534 psi | 85% | 2762 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,637 psi | 89% | 2844 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 48,544 psi | 76% | 2825 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 84% | 55,419 psi | 87% | 2690 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,927 psi | 89% | 2762 fps | 99% |
| Rottweil R 905 | <<locked>> | 94% | 54,360 psi | 85% | 2772 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 86% | 54,360 psi | 85% | 2690 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,289 psi | 88% | 2710 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 56,507 psi | 89% | 2674 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 54,331 psi | 85% | 2707 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,956 psi | 89% | 2749 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,883 psi | 88% | 2569 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,695 psi | 87% | 2667 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 57,595 psi | 90% | 2822 fps | 99.7% |
| Somchem S355 | <<locked>> | 84% | 55,332 psi | 87% | 2687 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,853 psi | 86% | 2707 fps | 98.2% |
| Somchem S365 | <<locked>> | 92% | 56,869 psi | 89% | 2776 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 54,897 psi | 86% | 2746 fps | 99.8% |
| Unknown powder | <<locked>> | 88% | 57,334 psi | 90% | 2779 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 56,420 psi | 88% | 2657 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,288 psi | 87% | 2717 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 54,157 psi | 85% | 2723 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 82% | 57,203 psi | 90% | 2654 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 54,375 psi | 85% | 2726 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,086 psi | 88% | 2792 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,985 psi | 88% | 2864 fps | 98.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 51,605 psi | 81% | 2785 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 54,708 psi | 86% | 2680 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,099 psi | 85% | 2759 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 53,635 psi | 84% | 2894 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,521 psi | 89% | 2766 fps | 99.6% |
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% | 48,283 psi | 76% | 2556 fps | 99.1% |
| Accurate 3100 | <<locked>> | 80% | 30,966 psi | 49% | 2297 fps | 96.7% |
| Accurate 4064 | <<locked>> | 80% | 53,766 psi | 84% | 2621 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,829 psi | 66% | 2536 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 92% | 45,049 psi | 71% | 2677 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 50,198 psi | 79% | 2608 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 35,128 psi | 55% | 2415 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 88% | 40,698 psi | 64% | 2569 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 96% | 38,885 psi | 61% | 2523 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 94% | 32,532 psi | 51% | 2431 fps | 96.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,111 psi | 80% | 2631 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,306 psi | 63% | 2546 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,050 psi | 72% | 2654 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 35,085 psi | 55% | 2415 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 84% | 35,302 psi | 55% | 2464 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,747 psi | 47% | 2326 fps | 99.3% |
| Alliant Reloder-25 | <<locked>> | 82% | 27,833 psi | 44% | 2287 fps | 95.7% |
| Alliant Reloder-26 | 90.7 gr | 80% | 32,039 psi | 50% | 2448 fps | 98.5% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 52,141 psi | 82% | 2703 fps | 95.4% |
| Bofors RP15 | <<locked>> | 86% | 35,070 psi | 55% | 2457 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 51,793 psi | 81% | 2644 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 37,115 psi | 58% | 2539 fps | 95.4% |
| Bofors RP5 | <<locked>> | 84% | 35,302 psi | 55% | 2464 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 45,136 psi | 71% | 2539 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 94% | 37,478 psi | 59% | 2493 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 51,909 psi | 81% | 2664 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 47,210 psi | 74% | 2648 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 80% | 42,554 psi | 67% | 2526 fps | 97.8% |
| Hodgdon H4831 | <<locked>> | 90% | 40,625 psi | 64% | 2516 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 88% | 42,685 psi | 67% | 2559 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,884 psi | 59% | 2438 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,577 psi | 84% | 2697 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 34,998 psi | 55% | 2526 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 42,453 psi | 67% | 2602 fps | 98.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,543 psi | 43% | 1496 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,866 psi | 83% | 2644 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,400 psi | 77% | 2585 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,196 psi | 76% | 2569 fps | 99.5% |
| IMR 4350 | <<locked>> | 80% | 40,683 psi | 64% | 2477 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,557 psi | 73% | 2566 fps | 99.3% |
| IMR 4831 | <<locked>> | 80% | 36,318 psi | 57% | 2415 fps | 99.4% |
| IMR 4955 Enduron | <<locked>> | 84% | 40,059 psi | 63% | 2467 fps | 95% |
| IMR 7828 SSC | 93.2 gr | 86% | 39,030 psi | 61% | 2543 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 53,200 psi | 83% | 2631 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,034 psi | 69% | 2520 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 42,279 psi | 66% | 2507 fps | 98.9% |
| Lovex S071 | <<locked>> | 82% | 28,500 psi | 45% | 2234 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 53,853 psi | 84% | 2684 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,292 psi | 63% | 2510 fps | 96.8% |
| Norma 217 | <<locked>> | 98% | 32,648 psi | 51% | 2470 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 32,155 psi | 50% | 2415 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 41,176 psi | 65% | 2526 fps | 99.9% |
| Ramshot Grand | 95.3 gr | 84% | 37,652 psi | 59% | 2526 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 40,001 psi | 63% | 2523 fps | 99% |
| Ramshot Magnum | <<locked>> | 84% | 32,735 psi | 51% | 2398 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,195 psi | 44% | 1535 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,721 psi | 81% | 2651 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,849 psi | 77% | 2697 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,553 psi | 65% | 2556 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,987 psi | 63% | 2569 fps | 99.7% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 31,952 psi | 50% | 2448 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 48,733 psi | 76% | 2595 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 39,001 psi | 61% | 2454 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 80% | 34,214 psi | 54% | 2395 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 45,136 psi | 71% | 2539 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,034 psi | 69% | 2520 fps | 99.7% |
| Shooters World Precision | <<locked>> | 80% | 53,200 psi | 83% | 2631 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,279 psi | 66% | 2507 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,922 psi | 78% | 2651 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,443 psi | 77% | 2487 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,047 psi | 67% | 2467 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 33,895 psi | 53% | 2392 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 48,791 psi | 76% | 2592 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 42,279 psi | 66% | 2493 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 37,913 psi | 59% | 2487 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,867 psi | 55% | 2385 fps | 96.4% |
| Unknown powder | <<locked>> | 80% | 44,295 psi | 69% | 2575 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 46,586 psi | 73% | 2523 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,699 psi | 67% | 2523 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 34,316 psi | 54% | 2369 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 53,664 psi | 84% | 2608 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,032 psi | 66% | 2526 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 33,257 psi | 52% | 2398 fps | 99.2% |
| Vihtavuori N560 | <<locked>> | 86% | 39,856 psi | 62% | 2575 fps | 95% |
| Vihtavuori N565 | <<locked>> | 92% | 39,479 psi | 62% | 2562 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,582 psi | 65% | 2487 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,210 psi | 74% | 2648 fps | 99.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,339 psi | 41% | 2333 fps | 99.3% |
| Winchester Supreme 780 | <<locked>> | 80% | 34,519 psi | 54% | 2375 fps | 95% |
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 89 powders for .378 Weath. Mag. loaded with the .375 | 300gr | Nosler AccuBond. Alliant Reloder-26 delivers the highest muzzle velocity at 2,910 fps; across all powders the maximum-charge window runs from 1,677 fps to 2,910 fps. ADI AR 2217 gives the best case fill at 100 %, and 89 of the 89 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.375" calls for a 1:16.0 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. Alliant Reloder-26, Ramshot Grand, IMR 7828 SSC rank at the top here: for .378 Weath. Mag. with the .375 | 300gr | Nosler AccuBond 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.