Load Specifications
Load data in caliber .378 Weath. Mag. with .375 | 235gr | Barnes XLC S bullet and 91 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, ReloadSwiss RS 70 and Accurate High Country.
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 2700 | <<locked>> | 82% | 54,375 psi | 85% | 2963 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,681 psi | 89% | 3077 fps | 99.7% |
| Accurate 4064 | <<locked>> | 82% | 55,114 psi | 86% | 2972 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,042 psi | 86% | 3077 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 56,956 psi | 89% | 3222 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 86% | 56,913 psi | 89% | 3041 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,984 psi | 86% | 3104 fps | 97.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,318 psi | 88% | 3153 fps | 96.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,072 psi | 88% | 3169 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 55,158 psi | 86% | 3104 fps | 97.9% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 55,158 psi | 86% | 3104 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,723 psi | 86% | 3018 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,824 psi | 86% | 3038 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,694 psi | 86% | 3123 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,115 psi | 88% | 3153 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,476 psi | 85% | 3094 fps | 97.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,347 psi | 87% | 3156 fps | 98.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,562 psi | 82% | 3091 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,050 psi | 72% | 3015 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 98% | 56,376 psi | 88% | 3238 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,039 psi | 80% | 3077 fps | 97.3% |
| Bofors RP3 | <<locked>> | 84% | 55,985 psi | 88% | 3041 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,347 psi | 87% | 3156 fps | 98.2% |
| Bofors RP7 | <<locked>> | 88% | 54,897 psi | 86% | 3015 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 84% | 55,927 psi | 88% | 3051 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 56,405 psi | 88% | 3120 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 88% | 55,941 psi | 88% | 3071 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 98% | 56,565 psi | 89% | 3097 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,303 psi | 87% | 3077 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,274 psi | 87% | 3045 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,724 psi | 89% | 3084 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,136 psi | 71% | 3045 fps | 96.5% |
| Hodgdon Superformance | <<locked>> | 90% | 56,289 psi | 88% | 3153 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,796 psi | 58% | 1909 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,217 psi | 90% | 3045 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,478 psi | 89% | 3025 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,448 psi | 87% | 3002 fps | 99% |
| IMR 4350 | <<locked>> | 92% | 55,521 psi | 87% | 3045 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,101 psi | 88% | 3038 fps | 99.1% |
| IMR 4831 | <<locked>> | 92% | 55,143 psi | 86% | 3061 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,246 psi | 88% | 3068 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,549 psi | 85% | 3028 fps | 96.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,882 psi | 84% | 3127 fps | 96.5% |
| Lovex S060 | <<locked>> | 82% | 57,740 psi | 90% | 3002 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 57,130 psi | 90% | 3022 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,724 psi | 89% | 3041 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 54,766 psi | 86% | 3031 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,572 psi | 75% | 2927 fps | 98.7% |
| Norma 203B | <<locked>> | 84% | 57,711 psi | 90% | 3081 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,202 psi | 88% | 3100 fps | 97.9% |
| Norma MRP | <<locked>> | 98% | 54,998 psi | 86% | 3186 fps | 99.2% |
| Norma URP | <<locked>> | 92% | 56,594 psi | 89% | 3107 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,563 psi | 86% | 3048 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,259 psi | 85% | 3143 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 92% | 55,303 psi | 87% | 3107 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,849 psi | 77% | 3015 fps | 97.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,521 psi | 59% | 1955 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,579 psi | 87% | 3028 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,521 psi | 87% | 3143 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,360 psi | 85% | 3094 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,159 psi | 88% | 3176 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,208 psi | 71% | 3038 fps | 97.6% |
| Rottweil R 902 | <<locked>> | 82% | 55,869 psi | 88% | 2982 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,130 psi | 88% | 3035 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,710 psi | 89% | 3071 fps | 97.1% |
| Rottweil R 905 | <<locked>> | 98% | 57,392 psi | 90% | 3136 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 54,897 psi | 86% | 3015 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,724 psi | 89% | 3041 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 57,130 psi | 90% | 3022 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,766 psi | 86% | 3031 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,826 psi | 89% | 3087 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,275 psi | 88% | 2904 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,391 psi | 88% | 2989 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,884 psi | 89% | 3133 fps | 98.3% |
| Somchem S355 | <<locked>> | 86% | 55,695 psi | 87% | 3025 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,085 psi | 86% | 3005 fps | 95.9% |
| Somchem S365 | <<locked>> | 94% | 56,014 psi | 88% | 3114 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,868 psi | 86% | 3061 fps | 98.7% |
| Vihtavuori N135 | <<locked>> | 82% | 55,970 psi | 88% | 2936 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,941 psi | 88% | 2953 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,826 psi | 89% | 2995 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,158 psi | 86% | 3045 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,824 psi | 84% | 3025 fps | 98.2% |
| Vihtavuori N540 | <<locked>> | 84% | 57,682 psi | 90% | 2999 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,549 psi | 85% | 3054 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 98% | 55,506 psi | 87% | 3123 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,245 psi | 87% | 3169 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,549 psi | 85% | 3009 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,521 psi | 89% | 3123 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,834 psi | 75% | 3159 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,578 psi | 86% | 3048 fps | 97.8% |
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 2700 | <<locked>> | 80% | 51,126 psi | 80% | 2907 fps | 97.8% |
| Accurate 3100 | <<locked>> | 84% | 34,200 psi | 54% | 2638 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 51,938 psi | 81% | 2927 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,943 psi | 63% | 2795 fps | 98.5% |
| Accurate High Country | 107.6 gr | 92% | 46,702 psi | 73% | 3031 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 47,587 psi | 75% | 2884 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 45,614 psi | 71% | 2927 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 96% | 49,574 psi | 78% | 3031 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,446 psi | 82% | 3110 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 43,105 psi | 68% | 2871 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 43,105 psi | 68% | 2871 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,530 psi | 76% | 2913 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,706 psi | 81% | 2986 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,043 psi | 60% | 2789 fps | 98.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,033 psi | 67% | 2923 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 88% | 42,641 psi | 67% | 2864 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 92% | 43,004 psi | 67% | 2917 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,877 psi | 45% | 2552 fps | 96.7% |
| Alliant Reloder-25 | <<locked>> | 90% | 34,229 psi | 54% | 2723 fps | 95.6% |
| Alliant Reloder-26 | 98.8 gr | 82% | 32,793 psi | 51% | 2730 fps | 96% |
| Bofors RP15 | <<locked>> | 96% | 45,078 psi | 71% | 2963 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 49,342 psi | 77% | 2933 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 43,004 psi | 67% | 2917 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 43,323 psi | 68% | 2795 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 80% | 49,327 psi | 77% | 2936 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 80% | 41,104 psi | 64% | 2828 fps | 96.4% |
| Hodgdon H4350 | <<locked>> | 80% | 43,743 psi | 69% | 2841 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 96% | 52,939 psi | 83% | 3038 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 96% | 51,895 psi | 81% | 3018 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,824 psi | 56% | 2684 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,301 psi | 84% | 3031 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 42,409 psi | 66% | 2976 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 40,045 psi | 63% | 2835 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,586 psi | 43% | 1706 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,896 psi | 84% | 2992 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,067 psi | 78% | 2917 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,272 psi | 82% | 2946 fps | 98.6% |
| IMR 4350 | <<locked>> | 82% | 41,162 psi | 65% | 2769 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,295 psi | 69% | 2822 fps | 97% |
| IMR 4831 | <<locked>> | 80% | 38,130 psi | 60% | 2740 fps | 98.2% |
| IMR 4895 | <<locked>> | 80% | 52,968 psi | 83% | 3015 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 51,445 psi | 81% | 2972 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 98% | 50,488 psi | 79% | 3064 fps | 95.6% |
| Lovex S060 | <<locked>> | 80% | 54,418 psi | 85% | 2953 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 50,778 psi | 80% | 2920 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,366 psi | 66% | 2779 fps | 97.9% |
| Lovex S070 | <<locked>> | 80% | 40,741 psi | 64% | 2759 fps | 96.4% |
| Lovex S071 | <<locked>> | 90% | 35,389 psi | 55% | 2667 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 51,097 psi | 80% | 2972 fps | 100% |
| Norma 204 | <<locked>> | 86% | 46,224 psi | 72% | 2917 fps | 95.8% |
| Norma MRP | <<locked>> | 88% | 39,740 psi | 62% | 2877 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 39,131 psi | 61% | 2779 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 80% | 51,111 psi | 80% | 2989 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 47,500 psi | 74% | 3012 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 37,884 psi | 59% | 2762 fps | 96.3% |
| Ramshot Magnum | <<locked>> | 96% | 42,685 psi | 67% | 2887 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,181 psi | 44% | 1749 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,168 psi | 77% | 2917 fps | 98.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,498 psi | 71% | 2976 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,262 psi | 62% | 2805 fps | 98.1% |
| ReloadSwiss RS 70 | 95.5 gr | 80% | 37,869 psi | 59% | 2805 fps | 97.4% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 39,653 psi | 62% | 2900 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 52,779 psi | 83% | 2936 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,644 psi | 73% | 2877 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 50,285 psi | 79% | 2959 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 88% | 41,945 psi | 66% | 2851 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 43,323 psi | 68% | 2795 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,366 psi | 66% | 2779 fps | 97.9% |
| Shooters World Precision | <<locked>> | 80% | 50,778 psi | 80% | 2920 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,741 psi | 64% | 2759 fps | 96.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,123 psi | 74% | 2927 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,108 psi | 74% | 2769 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,597 psi | 65% | 2720 fps | 96.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 44,208 psi | 69% | 2904 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 46,659 psi | 73% | 2874 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 51,866 psi | 81% | 2949 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 35,737 psi | 56% | 2740 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 40,219 psi | 63% | 2779 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 80% | 52,794 psi | 83% | 2894 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,707 psi | 83% | 2904 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,556 psi | 70% | 2799 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,437 psi | 63% | 2772 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 92% | 41,887 psi | 66% | 2805 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 51,097 psi | 80% | 2900 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,045 psi | 63% | 2779 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 80% | 31,836 psi | 50% | 2635 fps | 96.8% |
| Vihtavuori N560 | <<locked>> | 96% | 51,851 psi | 81% | 3107 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,407 psi | 62% | 2736 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 41,220 psi | 65% | 2831 fps | 96.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,947 psi | 41% | 2533 fps | 95.6% |
| Winchester Supreme 780 | <<locked>> | 92% | 44,744 psi | 70% | 2871 fps | 95.5% |
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 91 powders for .378 Weath. Mag. loaded with the .375 | 235gr | Barnes XLC S. Alliant Reloder-26 delivers the highest muzzle velocity at 3,238 fps; across all powders the maximum-charge window runs from 1,909 fps to 3,238 fps. Accurate 3100 gives the best case fill at 100 %, and 91 of the 91 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 235.0 gr projectile in 0.375" calls for a 1:6.0 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, ReloadSwiss RS 70, Accurate High Country rank at the top here: for .378 Weath. Mag. with the .375 | 235gr | Barnes XLC S 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.