Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Norma Semi Soft 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% | 54,578 psi | 86% | 3012 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,806 psi | 78% | 3028 fps | 96.9% |
| Accurate High Country | <<locked>> | 82% | 56,304 psi | 88% | 3173 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 84% | 57,392 psi | 90% | 3182 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 55,376 psi | 87% | 3100 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 54,099 psi | 85% | 3114 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 94% | 57,276 psi | 90% | 3159 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 53,780 psi | 84% | 3219 fps | 98.6% |
| ADI AR 2225 | <<locked>> | 96% | 56,884 psi | 89% | 3182 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,013 psi | 86% | 3087 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,694 psi | 86% | 3110 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,695 psi | 89% | 3071 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,537 psi | 90% | 3150 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 57,595 psi | 90% | 3159 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,941 psi | 88% | 3199 fps | 98.6% |
| Alliant Reloder-50 | <<locked>> | 98% | 56,043 psi | 88% | 3189 fps | 98.2% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,447 psi | 85% | 3071 fps | 98.5% |
| Bofors RP15 | <<locked>> | 86% | 54,259 psi | 85% | 3100 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 57,305 psi | 90% | 3173 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,694 psi | 86% | 3110 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,723 psi | 86% | 3117 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,565 psi | 89% | 3104 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,593 psi | 87% | 3087 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 90% | 57,101 psi | 89% | 3248 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,898 psi | 59% | 2014 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,637 psi | 89% | 3081 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 86% | 56,579 psi | 89% | 3163 fps | 100% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,738 psi | 87% | 3163 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 56,492 psi | 89% | 3038 fps | 100% |
| Norma 217 | <<locked>> | 98% | 57,319 psi | 90% | 3186 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,708 psi | 86% | 3120 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 53,911 psi | 84% | 3120 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 88% | 56,492 psi | 89% | 3110 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,001 psi | 61% | 2060 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 53,766 psi | 84% | 3166 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 57,101 psi | 89% | 3202 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 55,550 psi | 87% | 3064 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 54,882 psi | 86% | 3081 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,750 psi | 81% | 3041 fps | 97% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,520 psi | 85% | 3074 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 57,000 psi | 89% | 3054 fps | 99.8% |
| Somchem S385 | <<locked>> | 82% | 55,114 psi | 86% | 3045 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,143 psi | 86% | 3035 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,578 psi | 86% | 3061 fps | 97% |
| Vihtavuori N555 | <<locked>> | 82% | 54,723 psi | 86% | 3045 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 54,085 psi | 85% | 3127 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 88% | 55,593 psi | 87% | 3127 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 92% | 57,363 psi | 90% | 3199 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 92% | 54,969 psi | 86% | 3205 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 86% | 57,667 psi | 90% | 3163 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,795 psi | 86% | 3041 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 47,688 psi | 75% | 2897 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 46,180 psi | 72% | 2959 fps | 95.9% |
| Accurate High Country | <<locked>> | 80% | 52,634 psi | 82% | 3107 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 80% | 49,777 psi | 78% | 3048 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 80% | 51,764 psi | 81% | 3035 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 47,036 psi | 74% | 2982 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 80% | 35,128 psi | 55% | 2710 fps | 96.4% |
| ADI AR 2218 | <<locked>> | 90% | 43,062 psi | 67% | 2982 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 32,474 psi | 51% | 2680 fps | 98.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,517 psi | 81% | 3028 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,790 psi | 75% | 2986 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,543 psi | 73% | 2907 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,741 psi | 64% | 2858 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 53,388 psi | 84% | 3097 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 44,701 psi | 70% | 2979 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 92% | 44,788 psi | 70% | 2969 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,802 psi | 70% | 2884 fps | 96.3% |
| Bofors RP15 | <<locked>> | 80% | 44,483 psi | 70% | 2920 fps | 99.3% |
| Bofors RP30 | <<locked>> | 80% | 38,043 psi | 60% | 2792 fps | 97.4% |
| Bofors RP5 | <<locked>> | 80% | 47,790 psi | 75% | 2986 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 38,276 psi | 60% | 2792 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 80% | 49,443 psi | 77% | 2979 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,559 psi | 76% | 2963 fps | 98.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 39,827 psi | 62% | 2917 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,485 psi | 45% | 1804 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,937 psi | 78% | 2963 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 80% | 45,847 psi | 72% | 2969 fps | 99% |
| IMR 8133 Enduron | <<locked>> | 84% | 34,577 psi | 54% | 2720 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 41,075 psi | 64% | 2769 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 30,371 psi | 48% | 2618 fps | 96.4% |
| Norma MRP | <<locked>> | 80% | 51,126 psi | 80% | 3061 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,514 psi | 73% | 2986 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 80% | 41,959 psi | 66% | 2851 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,283 psi | 46% | 1847 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,291 psi | 62% | 2887 fps | 99.8% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 36,187 psi | 57% | 2769 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 52,170 psi | 82% | 3005 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 51,314 psi | 80% | 3018 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 45,136 psi | 71% | 2913 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,966 psi | 80% | 3015 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 53,243 psi | 83% | 2992 fps | 99.5% |
| Somchem S385 | <<locked>> | 80% | 51,634 psi | 81% | 2989 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,295 psi | 71% | 2861 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 86% | 47,630 psi | 75% | 2930 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 51,329 psi | 80% | 2989 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,560 psi | 79% | 3061 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 80% | 42,293 psi | 66% | 2871 fps | 97.9% |
| Vihtavuori N568 | <<locked>> | 80% | 37,376 psi | 59% | 2792 fps | 95% |
| Vihtavuori N570 | <<locked>> | 86% | 44,208 psi | 69% | 2989 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,122 psi | 72% | 2986 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,819 psi | 75% | 2920 fps | 99.7% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 58 powders for .30-378 Weath. Mag. loaded with the .308 | 180gr | Norma Semi Soft Point. Hodgdon Retumbo delivers the highest muzzle velocity at 3,248 fps; across all powders the maximum-charge window runs from 2,014 fps to 3,248 fps. Accurate 8700 gives the best case fill at 100 %, and 58 of the 58 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:14.5 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, Lovex D100, Ramshot LRT 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.