Load Specifications
Bullet Manufacturer:Reichenberg
Bullet Weight:270 gr
Bullet Diameter:0.375"
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:1:16.5
Load data in caliber .378 Weath. Mag. with .375 | 270gr | Reichenberg HDB Universal bullet and 99 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate High Country 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% | 55,492 psi | 87% | 2756 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 57,261 psi | 90% | 2844 fps | 99.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,085 psi | 86% | 2887 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 56,014 psi | 88% | 2812 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 57,435 psi | 90% | 2936 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 56,739 psi | 89% | 3045 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 98% | 53,809 psi | 84% | 2982 fps | 97% |
| ADI AR 2208 | <<locked>> | 86% | 56,434 psi | 88% | 2854 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,737 psi | 86% | 2930 fps | 98.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,101 psi | 88% | 2989 fps | 98.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,057 psi | 88% | 2982 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,868 psi | 86% | 2927 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,868 psi | 86% | 2927 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 57,203 psi | 90% | 2874 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 57,479 psi | 90% | 2900 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,679 psi | 86% | 2940 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 55,941 psi | 88% | 2963 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,128 psi | 85% | 2920 fps | 98.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,071 psi | 86% | 2979 fps | 99.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,069 psi | 82% | 2904 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,005 psi | 71% | 2838 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 55,999 psi | 88% | 3048 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,473 psi | 79% | 2904 fps | 98.4% |
| Bofors RP3 | <<locked>> | 84% | 54,433 psi | 85% | 2841 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,071 psi | 86% | 2979 fps | 99.1% |
| Bofors RP7 | <<locked>> | 90% | 57,435 psi | 90% | 2887 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 44,788 psi | 70% | 2779 fps | 96.5% |
| Hodgdon H380 | <<locked>> | 84% | 54,911 psi | 86% | 2861 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 55,854 psi | 88% | 2936 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 88% | 55,695 psi | 87% | 2897 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 98% | 56,260 psi | 88% | 2930 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,056 psi | 86% | 2910 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,882 psi | 86% | 2861 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,318 psi | 88% | 2894 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,106 psi | 69% | 2877 fps | 97.9% |
| Hodgdon Superformance | <<locked>> | 90% | 56,362 psi | 88% | 2979 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,405 psi | 57% | 1772 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,811 psi | 89% | 2854 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,825 psi | 87% | 2835 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,940 psi | 86% | 2822 fps | 99.6% |
| IMR 4350 | <<locked>> | 92% | 55,071 psi | 86% | 2871 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,709 psi | 87% | 2861 fps | 99.7% |
| IMR 4831 | <<locked>> | 92% | 54,070 psi | 85% | 2874 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,317 psi | 87% | 2874 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,143 psi | 85% | 2861 fps | 97.4% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,447 psi | 84% | 2956 fps | 97.9% |
| Lovex S060 | <<locked>> | 82% | 57,319 psi | 90% | 2818 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,927 psi | 88% | 2825 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,695 psi | 87% | 2854 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 57,087 psi | 89% | 2900 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,585 psi | 71% | 2736 fps | 99.3% |
| Norma 201 | <<locked>> | 82% | 57,217 psi | 90% | 2835 fps | 100% |
| Norma 203B | <<locked>> | 84% | 56,768 psi | 89% | 2884 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,927 psi | 88% | 2927 fps | 98.9% |
| Norma MRP | <<locked>> | 98% | 54,766 psi | 86% | 3009 fps | 99.8% |
| Norma URP | <<locked>> | 92% | 56,072 psi | 88% | 2920 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 53,998 psi | 85% | 2861 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,925 psi | 85% | 2976 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 92% | 54,839 psi | 86% | 2927 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,921 psi | 75% | 2848 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,057 psi | 58% | 1814 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,882 psi | 86% | 2848 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,361 psi | 87% | 2949 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 57,348 psi | 90% | 2959 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 55,970 psi | 88% | 2995 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,063 psi | 69% | 2874 fps | 98.8% |
| Rottweil R 902 | <<locked>> | 82% | 54,375 psi | 85% | 2789 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,650 psi | 86% | 2838 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,405 psi | 88% | 2900 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 98% | 57,101 psi | 89% | 2963 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 90% | 57,435 psi | 90% | 2887 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,695 psi | 87% | 2854 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 55,927 psi | 88% | 2825 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,087 psi | 89% | 2900 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,391 psi | 88% | 2900 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,188 psi | 90% | 2871 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,651 psi | 87% | 2720 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,303 psi | 87% | 2808 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,608 psi | 89% | 2959 fps | 99.2% |
| Somchem S335 | <<locked>> | 82% | 57,667 psi | 90% | 2756 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 54,491 psi | 85% | 2831 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,520 psi | 85% | 2841 fps | 97.2% |
| Somchem S365 | <<locked>> | 94% | 55,564 psi | 87% | 2920 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 57,522 psi | 90% | 2933 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 82% | 54,911 psi | 86% | 2743 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,230 psi | 87% | 2762 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 55,941 psi | 88% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,549 psi | 85% | 2861 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,214 psi | 83% | 2854 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 84% | 56,898 psi | 89% | 2808 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 57,174 psi | 90% | 2920 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 54,433 psi | 85% | 2930 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,013 psi | 86% | 2999 fps | 97.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 46,746 psi | 73% | 2841 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,114 psi | 85% | 2825 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,028 psi | 88% | 2940 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,427 psi | 74% | 2972 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 57,537 psi | 90% | 2877 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,099 psi | 85% | 2874 fps | 98.8% |
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% | 51,967 psi | 81% | 2710 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,995 psi | 78% | 2730 fps | 98.7% |
| Accurate 3100 | <<locked>> | 84% | 31,575 psi | 49% | 2441 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 49,327 psi | 77% | 2720 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,753 psi | 59% | 2602 fps | 99% |
| Accurate High Country | 101.7 gr | 90% | 42,569 psi | 67% | 2789 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 94% | 46,557 psi | 73% | 2854 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 46,818 psi | 73% | 2703 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 39,334 psi | 62% | 2641 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 94% | 45,701 psi | 72% | 2802 fps | 95.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,141 psi | 82% | 2923 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 39,479 psi | 62% | 2644 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 39,479 psi | 62% | 2644 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,398 psi | 74% | 2726 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,618 psi | 79% | 2795 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,883 psi | 58% | 2612 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,974 psi | 66% | 2736 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 39,044 psi | 61% | 2638 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 90% | 39,218 psi | 61% | 2687 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,803 psi | 42% | 2365 fps | 97.3% |
| Alliant Reloder-25 | <<locked>> | 88% | 30,472 psi | 48% | 2487 fps | 95.7% |
| Alliant Reloder-26 | 93.2 gr | 80% | 28,616 psi | 45% | 2477 fps | 95.7% |
| Bofors RP15 | <<locked>> | 92% | 38,696 psi | 61% | 2674 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 47,572 psi | 75% | 2736 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 39,218 psi | 61% | 2687 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 41,843 psi | 66% | 2615 fps | 97.3% |
| Hodgdon H1000 | <<locked>> | 98% | 41,771 psi | 65% | 2713 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 47,921 psi | 75% | 2749 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 39,842 psi | 62% | 2651 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 80% | 42,844 psi | 67% | 2671 fps | 96.9% |
| Hodgdon H4831 | <<locked>> | 92% | 45,818 psi | 72% | 2753 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 44,817 psi | 70% | 2733 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,330 psi | 54% | 2503 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,576 psi | 82% | 2838 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 38,696 psi | 61% | 2749 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 38,827 psi | 61% | 2664 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,166 psi | 43% | 1585 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,374 psi | 84% | 2805 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,211 psi | 77% | 2733 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,517 psi | 81% | 2769 fps | 99.3% |
| IMR 4350 | <<locked>> | 80% | 37,521 psi | 59% | 2546 fps | 96.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,308 psi | 68% | 2644 fps | 98% |
| IMR 4831 | <<locked>> | 80% | 36,289 psi | 57% | 2552 fps | 98.8% |
| IMR 4895 | <<locked>> | 80% | 51,938 psi | 81% | 2825 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 44,831 psi | 70% | 2694 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 94% | 43,642 psi | 68% | 2776 fps | 95.4% |
| Lovex S060 | <<locked>> | 80% | 53,911 psi | 84% | 2769 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,356 psi | 77% | 2730 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,698 psi | 64% | 2595 fps | 98.6% |
| Lovex S070 | <<locked>> | 80% | 38,899 psi | 61% | 2575 fps | 97.3% |
| Lovex S071 | <<locked>> | 88% | 30,661 psi | 48% | 2421 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 53,737 psi | 84% | 2785 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,980 psi | 78% | 2782 fps | 100% |
| Norma 204 | <<locked>> | 82% | 39,566 psi | 62% | 2628 fps | 95.4% |
| Norma MRP | 95 gr | 84% | 33,388 psi | 52% | 2575 fps | 95% |
| Norma URP | <<locked>> | 80% | 37,608 psi | 59% | 2595 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 80% | 50,415 psi | 79% | 2805 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 43,381 psi | 68% | 2782 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 36,492 psi | 57% | 2585 fps | 97.3% |
| Ramshot Magnum | <<locked>> | 92% | 35,708 psi | 56% | 2592 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,688 psi | 43% | 1624 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,950 psi | 75% | 2736 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,643 psi | 70% | 2785 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,594 psi | 59% | 2618 fps | 98.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,477 psi | 57% | 2628 fps | 98.4% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 35,520 psi | 56% | 2664 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 51,198 psi | 80% | 2740 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,730 psi | 70% | 2684 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 43,584 psi | 68% | 2680 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 86% | 38,043 psi | 60% | 2618 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 41,843 psi | 66% | 2615 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,698 psi | 64% | 2595 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 49,356 psi | 77% | 2730 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,899 psi | 61% | 2575 fps | 97.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,151 psi | 72% | 2740 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,635 psi | 84% | 2818 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,195 psi | 72% | 2585 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,856 psi | 62% | 2539 fps | 97.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 37,724 psi | 59% | 2612 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 54,288 psi | 85% | 2713 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 45,107 psi | 71% | 2684 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 47,703 psi | 75% | 2726 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 34,069 psi | 53% | 2552 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 36,085 psi | 57% | 2546 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 51,648 psi | 81% | 2700 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,735 psi | 81% | 2713 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,047 psi | 67% | 2612 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,102 psi | 61% | 2595 fps | 99.1% |
| Vihtavuori N165 | <<locked>> | 90% | 38,043 psi | 60% | 2582 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 80% | 49,922 psi | 78% | 2710 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,392 psi | 60% | 2595 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 80% | 29,631 psi | 46% | 2441 fps | 97.3% |
| Vihtavuori N560 | <<locked>> | 92% | 44,643 psi | 70% | 2812 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 98% | 43,482 psi | 68% | 2782 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,247 psi | 60% | 2566 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 39,958 psi | 63% | 2651 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,540 psi | 37% | 2336 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 53,780 psi | 84% | 2825 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 37,942 psi | 59% | 2582 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 99 powders for .378 Weath. Mag. loaded with the .375 | 270gr | Reichenberg HDB Universal. Alliant Reloder-26 delivers the highest muzzle velocity at 3,048 fps; across all powders the maximum-charge window runs from 1,772 fps to 3,048 fps. Accurate 3100 gives the best case fill at 100 %, and 99 of the 99 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, ADI AR 2213, Alliant Reloder-22 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, Accurate High Country, Norma MRP rank at the top here: for .378 Weath. Mag. with the .375 | 270gr | Reichenberg HDB Universal 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.