Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 190gr | Speer Boat Tail Hollow Point bullet and 51 powders. The key underlying parameters are shown in the table above.
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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Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 84% | 54,984 psi | 86% | 2946 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 50,285 psi | 79% | 2976 fps | 97.5% |
| Accurate High Country | <<locked>> | 82% | 56,855 psi | 89% | 3110 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 53,998 psi | 85% | 3058 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 82% | 55,854 psi | 88% | 3035 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 54,578 psi | 86% | 3051 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 53,998 psi | 85% | 3038 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 54,360 psi | 85% | 3163 fps | 99% |
| ADI AR 2225 | <<locked>> | 96% | 57,392 psi | 90% | 3120 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,521 psi | 87% | 3022 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 55,172 psi | 86% | 3048 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 57,348 psi | 90% | 3005 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 54,230 psi | 85% | 3028 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 56,478 psi | 89% | 3143 fps | 99% |
| Alliant Reloder-50 | <<locked>> | 98% | 56,637 psi | 89% | 3136 fps | 98.7% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,868 psi | 86% | 3012 fps | 98.8% |
| Bofors RP15 | <<locked>> | 86% | 54,737 psi | 86% | 3038 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 54,172 psi | 85% | 3054 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 55,172 psi | 86% | 3048 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 55,434 psi | 87% | 3058 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 57,058 psi | 89% | 3041 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 84% | 56,043 psi | 88% | 3025 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 90% | 57,682 psi | 90% | 3186 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,029 psi | 60% | 1955 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 57,159 psi | 90% | 3018 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 86% | 57,014 psi | 89% | 3097 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 55,825 psi | 87% | 2966 fps | 96.2% |
| IMR 8133 Enduron | <<locked>> | 98% | 56,347 psi | 88% | 3104 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 57,000 psi | 89% | 2976 fps | 100% |
| Norma 217 | <<locked>> | 96% | 54,012 psi | 85% | 3068 fps | 100% |
| Norma MRP | <<locked>> | 82% | 55,245 psi | 87% | 3061 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 54,592 psi | 86% | 3061 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 57,101 psi | 89% | 3048 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,030 psi | 61% | 2001 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 54,346 psi | 85% | 3107 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 53,621 psi | 84% | 3077 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 56,115 psi | 88% | 3002 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 55,376 psi | 87% | 3015 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 52,272 psi | 82% | 2989 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 55,013 psi | 86% | 3012 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 57,377 psi | 90% | 2992 fps | 99.9% |
| Somchem S385 | <<locked>> | 82% | 55,637 psi | 87% | 2982 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,666 psi | 87% | 2972 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,969 psi | 86% | 3002 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 82% | 55,317 psi | 87% | 2979 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 54,607 psi | 86% | 3064 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 56,057 psi | 88% | 3064 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 54,128 psi | 85% | 3081 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 92% | 55,608 psi | 87% | 3150 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 84% | 54,418 psi | 85% | 3045 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 55,259 psi | 87% | 2979 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 48,182 psi | 76% | 2838 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 43,395 psi | 68% | 2844 fps | 95.5% |
| Accurate High Country | <<locked>> | 80% | 53,084 psi | 83% | 3048 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 50,415 psi | 79% | 2992 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 80% | 52,228 psi | 82% | 2976 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 47,471 psi | 74% | 2927 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 80% | 35,520 psi | 56% | 2664 fps | 97.1% |
| ADI AR 2218 | <<locked>> | 90% | 43,555 psi | 68% | 2940 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 32,808 psi | 51% | 2635 fps | 98.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,040 psi | 82% | 2966 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 48,254 psi | 76% | 2927 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,992 psi | 74% | 2844 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 41,220 psi | 65% | 2802 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 41,814 psi | 66% | 2854 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 90% | 41,959 psi | 66% | 2851 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,121 psi | 71% | 2831 fps | 96.9% |
| Bofors RP15 | <<locked>> | 80% | 44,947 psi | 70% | 2861 fps | 99.6% |
| Bofors RP30 | <<locked>> | 80% | 38,537 psi | 60% | 2743 fps | 98% |
| Bofors RP5 | <<locked>> | 80% | 48,254 psi | 76% | 2927 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 38,638 psi | 61% | 2740 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 80% | 49,835 psi | 78% | 2920 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,965 psi | 77% | 2904 fps | 99.2% |
| Hodgdon Retumbo | <<locked>> | 80% | 40,234 psi | 63% | 2861 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,587 psi | 45% | 1752 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,386 psi | 79% | 2904 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 80% | 46,282 psi | 73% | 2910 fps | 99.3% |
| IMR 7977 Enduron | <<locked>> | 88% | 52,359 psi | 82% | 2907 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 82% | 32,648 psi | 51% | 2612 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 41,510 psi | 65% | 2713 fps | 100% |
| Norma 217 | <<locked>> | 80% | 30,821 psi | 48% | 2579 fps | 97.2% |
| Norma MRP | <<locked>> | 80% | 51,576 psi | 81% | 2999 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 47,079 psi | 74% | 2930 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 80% | 42,409 psi | 66% | 2795 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,414 psi | 46% | 1795 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,827 psi | 62% | 2838 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 36,709 psi | 58% | 2726 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 52,605 psi | 82% | 2946 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 51,822 psi | 81% | 2959 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 45,600 psi | 71% | 2864 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 51,474 psi | 81% | 2953 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 53,795 psi | 84% | 2936 fps | 99.7% |
| Somchem S385 | <<locked>> | 80% | 52,069 psi | 82% | 2927 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,788 psi | 72% | 2805 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 84% | 45,005 psi | 71% | 2815 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 51,822 psi | 81% | 2927 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,952 psi | 80% | 3002 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 80% | 42,786 psi | 67% | 2818 fps | 98.4% |
| Vihtavuori N568 | <<locked>> | 80% | 37,782 psi | 59% | 2743 fps | 95.7% |
| Vihtavuori N570 | <<locked>> | 84% | 41,669 psi | 65% | 2871 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,775 psi | 73% | 2927 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 48,269 psi | 76% | 2864 fps | 99.9% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 57 powders for .30-378 Weath. Mag. loaded with the .308 | 190gr | Speer Boat Tail Hollow Point. Hodgdon Retumbo delivers the highest muzzle velocity at 3,186 fps; across all powders the maximum-charge window runs from 1,955 fps to 3,186 fps. Accurate 8700 gives the best case fill at 100 %, and 57 of the 57 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 190.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, Hodgdon US 869 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. As outliers, Hodgdon US 869, Ramshot LRT, Vihtavuori 20N29 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.