Load Specifications
Load data in caliber .378 Weath. Mag. with .375 | 300gr | CutEdge DGBR bullet and 89 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate High Country, 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% | 57,609 psi | 90% | 2717 fps | 99.9% |
| Accurate 3100 | <<locked>> | 98% | 57,130 psi | 90% | 2776 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 57,174 psi | 90% | 2680 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 55,129 psi | 86% | 2759 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 54,781 psi | 86% | 2874 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 96% | 55,796 psi | 87% | 2881 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 84% | 57,029 psi | 89% | 2723 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,101 psi | 88% | 2818 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 98% | 57,551 psi | 90% | 2877 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 44,672 psi | 70% | 2657 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,465 psi | 62% | 2621 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 56,347 psi | 88% | 2815 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 56,347 psi | 88% | 2815 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 54,679 psi | 86% | 2694 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,231 psi | 88% | 2815 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,595 psi | 90% | 2831 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,564 psi | 87% | 2808 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,014 psi | 89% | 2871 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,201 psi | 85% | 2785 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,937 psi | 78% | 2792 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 54,462 psi | 85% | 2877 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 56,014 psi | 88% | 2785 fps | 96.6% |
| Bofors RP15ᴾ | <<locked>> | 100% | 55,825 psi | 87% | 2851 fps | 99.7% |
| Bofors RP3 | <<locked>> | 82% | 55,419 psi | 87% | 2710 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 45,788 psi | 72% | 2726 fps | 98.1% |
| Bofors RP5 | <<locked>> | 98% | 57,014 psi | 89% | 2871 fps | 99.8% |
| Bofors RP7 | <<locked>> | 86% | 54,737 psi | 86% | 2713 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,371 psi | 77% | 2746 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 82% | 55,695 psi | 87% | 2733 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,305 psi | 90% | 2818 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 56,550 psi | 89% | 2776 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 96% | 57,667 psi | 90% | 2818 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,434 psi | 88% | 2802 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,521 psi | 89% | 2736 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,950 psi | 77% | 2854 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 86% | 53,737 psi | 84% | 2802 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,724 psi | 58% | 1690 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,478 psi | 89% | 2703 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,086 psi | 88% | 2749 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,376 psi | 88% | 2736 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 55,550 psi | 87% | 2753 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,129 psi | 86% | 2749 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 98% | 55,085 psi | 86% | 2854 fps | 99.1% |
| Lovex S062 | <<locked>> | 82% | 56,724 psi | 89% | 2694 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,594 psi | 89% | 2730 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 54,563 psi | 86% | 2726 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,662 psi | 79% | 2687 fps | 100% |
| Norma 203B | <<locked>> | 82% | 57,711 psi | 90% | 2753 fps | 100% |
| Norma 204 | <<locked>> | 90% | 57,043 psi | 89% | 2805 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 34,911 psi | 55% | 2543 fps | 97% |
| Norma MRP | <<locked>> | 96% | 56,855 psi | 89% | 2894 fps | 100% |
| Norma URP | <<locked>> | 90% | 57,450 psi | 90% | 2795 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,811 psi | 87% | 2874 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 90% | 56,231 psi | 88% | 2805 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,780 psi | 84% | 2812 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,463 psi | 59% | 1729 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,405 psi | 87% | 2723 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,101 psi | 89% | 2818 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,216 psi | 87% | 2785 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 57,464 psi | 90% | 2867 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,182 psi | 77% | 2851 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 43,947 psi | 69% | 2726 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 84% | 55,608 psi | 87% | 2710 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 57,667 psi | 90% | 2789 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 94% | 54,911 psi | 86% | 2795 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 86% | 54,737 psi | 86% | 2713 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,594 psi | 89% | 2730 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 56,724 psi | 89% | 2694 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 54,563 psi | 86% | 2726 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,421 psi | 90% | 2769 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,246 psi | 88% | 2585 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,043 psi | 88% | 2690 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,462 psi | 85% | 2789 fps | 99.6% |
| Somchem S355 | <<locked>> | 84% | 55,448 psi | 87% | 2703 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,593 psi | 87% | 2733 fps | 98.5% |
| Somchem S365 | <<locked>> | 92% | 57,551 psi | 90% | 2795 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,361 psi | 87% | 2766 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 86% | 56,855 psi | 89% | 2677 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,854 psi | 88% | 2740 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 54,969 psi | 86% | 2749 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 82% | 57,493 psi | 90% | 2674 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 54,911 psi | 86% | 2746 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,492 psi | 89% | 2808 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 56,884 psi | 89% | 2890 fps | 99% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,301 psi | 82% | 2808 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,376 psi | 87% | 2700 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,450 psi | 90% | 2822 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 54,955 psi | 86% | 2917 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,564 psi | 87% | 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% | 54,041 psi | 85% | 2667 fps | 99.7% |
| Accurate 3100 | <<locked>> | 80% | 30,676 psi | 48% | 2303 fps | 96.7% |
| Accurate 4064 | <<locked>> | 80% | 53,693 psi | 84% | 2638 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,800 psi | 66% | 2549 fps | 100% |
| Accurate High Country | 95.3 gr | 84% | 38,464 psi | 60% | 2575 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 88% | 41,829 psi | 66% | 2635 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 50,430 psi | 79% | 2628 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 35,172 psi | 55% | 2431 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 86% | 38,261 psi | 60% | 2530 fps | 95% |
| ADI AR 2217 | <<locked>> | 96% | 39,073 psi | 61% | 2543 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 92% | 30,487 psi | 48% | 2388 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 35,447 psi | 56% | 2434 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 35,447 psi | 56% | 2434 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,401 psi | 81% | 2648 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,437 psi | 63% | 2559 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,412 psi | 73% | 2674 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 35,128 psi | 55% | 2428 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 84% | 35,389 psi | 55% | 2477 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,689 psi | 47% | 2336 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 82% | 27,688 psi | 43% | 2300 fps | 95.9% |
| Alliant Reloder-26 | 93.5 gr | 80% | 31,981 psi | 50% | 2461 fps | 98.6% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 49,588 psi | 78% | 2677 fps | 95.1% |
| Bofors RP15 | <<locked>> | 86% | 35,157 psi | 55% | 2474 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 51,837 psi | 81% | 2661 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 37,318 psi | 58% | 2556 fps | 95.7% |
| Bofors RP5 | <<locked>> | 84% | 35,389 psi | 55% | 2477 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 45,266 psi | 71% | 2559 fps | 99% |
| Hodgdon H1000 | <<locked>> | 92% | 37,478 psi | 59% | 2513 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 52,156 psi | 82% | 2684 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 43,700 psi | 68% | 2598 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 80% | 46,543 psi | 73% | 2615 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 86% | 40,886 psi | 64% | 2536 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 86% | 40,161 psi | 63% | 2523 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,927 psi | 59% | 2448 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 32,880 psi | 52% | 2487 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 42,844 psi | 67% | 2621 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,470 psi | 43% | 1509 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,055 psi | 83% | 2657 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,814 psi | 64% | 2493 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,688 psi | 73% | 2582 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 39,972 psi | 63% | 2500 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 40,176 psi | 63% | 2484 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 88% | 39,247 psi | 62% | 2562 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 53,301 psi | 84% | 2644 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,150 psi | 69% | 2536 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 42,337 psi | 66% | 2523 fps | 99% |
| Lovex S071 | <<locked>> | 82% | 28,108 psi | 44% | 2238 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 54,114 psi | 85% | 2703 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,509 psi | 63% | 2526 fps | 97% |
| Norma 217 | <<locked>> | 98% | 32,605 psi | 51% | 2484 fps | 96% |
| Norma MRP | 90.8 gr | 80% | 32,184 psi | 50% | 2428 fps | 96% |
| Norma URP | <<locked>> | 80% | 41,336 psi | 65% | 2543 fps | 99.9% |
| Ramshot Grand | <<locked>> | 88% | 38,754 psi | 61% | 2569 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 40,205 psi | 63% | 2539 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 86% | 31,952 psi | 50% | 2392 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,065 psi | 44% | 1545 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,011 psi | 82% | 2671 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,327 psi | 77% | 2713 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,655 psi | 65% | 2572 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,248 psi | 63% | 2589 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 31,937 psi | 50% | 2464 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 40,857 psi | 64% | 2664 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 48,791 psi | 76% | 2612 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 39,102 psi | 61% | 2470 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 80% | 34,214 psi | 54% | 2411 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 45,266 psi | 71% | 2559 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,150 psi | 69% | 2536 fps | 99.7% |
| Shooters World Precision | <<locked>> | 80% | 53,301 psi | 84% | 2644 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,337 psi | 66% | 2523 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,285 psi | 79% | 2667 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,705 psi | 78% | 2503 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,163 psi | 68% | 2487 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 33,910 psi | 53% | 2405 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 48,950 psi | 77% | 2612 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 42,467 psi | 67% | 2513 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 38,043 psi | 60% | 2500 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,737 psi | 54% | 2395 fps | 96.5% |
| Vihtavuori N150 | <<locked>> | 80% | 46,746 psi | 73% | 2539 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,859 psi | 67% | 2539 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 32,140 psi | 50% | 2329 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 53,954 psi | 85% | 2628 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,163 psi | 66% | 2543 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 33,185 psi | 52% | 2408 fps | 99.3% |
| Vihtavuori N560 | <<locked>> | 86% | 40,190 psi | 63% | 2595 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 92% | 39,566 psi | 62% | 2579 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,829 psi | 66% | 2503 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,816 psi | 69% | 2602 fps | 99.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,107 psi | 41% | 2339 fps | 99.3% |
| Winchester Supreme 780 | <<locked>> | 82% | 33,953 psi | 53% | 2379 fps | 95.1% |
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 | CutEdge DGBR. Winchester StaBALL HD delivers the highest muzzle velocity at 2,917 fps; across all powders the maximum-charge window runs from 1,690 fps to 2,917 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 1:6.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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 High Country, Alliant Reloder-26, Norma MRP rank at the top here: for .378 Weath. Mag. with the .375 | 300gr | CutEdge DGBR 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.