Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Norma PlastSpitz 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% | 54,186 psi | 85% | 3002 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,487 psi | 78% | 3022 fps | 96.8% |
| Accurate High Country | <<locked>> | 82% | 56,086 psi | 88% | 3169 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 84% | 57,188 psi | 90% | 3179 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 55,143 psi | 86% | 3094 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 57,725 psi | 90% | 3173 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 57,043 psi | 89% | 3156 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 53,461 psi | 84% | 3209 fps | 98.5% |
| ADI AR 2225 | <<locked>> | 96% | 56,521 psi | 89% | 3176 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,781 psi | 86% | 3081 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,462 psi | 85% | 3107 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,434 psi | 88% | 3064 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,101 psi | 89% | 3143 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 57,319 psi | 90% | 3156 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,593 psi | 87% | 3189 fps | 98.5% |
| Alliant Reloder-50 | <<locked>> | 98% | 55,724 psi | 87% | 3182 fps | 98.2% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,172 psi | 85% | 3068 fps | 98.4% |
| Bofors RP15 | <<locked>> | 88% | 57,566 psi | 90% | 3153 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 57,101 psi | 89% | 3169 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,462 psi | 85% | 3107 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,505 psi | 85% | 3114 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,347 psi | 88% | 3097 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,347 psi | 87% | 3081 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 90% | 56,637 psi | 89% | 3241 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,985 psi | 60% | 2014 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,434 psi | 88% | 3074 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 86% | 56,159 psi | 88% | 3156 fps | 99.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,535 psi | 87% | 3159 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 56,289 psi | 88% | 3038 fps | 100% |
| Norma 217 | <<locked>> | 98% | 56,956 psi | 89% | 3179 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,476 psi | 85% | 3120 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 57,696 psi | 90% | 3179 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 56,275 psi | 88% | 3104 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,943 psi | 61% | 2060 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 57,725 psi | 90% | 3225 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 56,753 psi | 89% | 3196 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 55,332 psi | 87% | 3061 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 54,650 psi | 86% | 3074 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,445 psi | 81% | 3038 fps | 96.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,273 psi | 85% | 3071 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,840 psi | 89% | 3051 fps | 99.8% |
| Somchem S385 | <<locked>> | 82% | 54,897 psi | 86% | 3041 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,926 psi | 86% | 3028 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,259 psi | 85% | 3054 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 82% | 54,476 psi | 85% | 3038 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 57,725 psi | 90% | 3186 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 55,230 psi | 87% | 3120 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 92% | 57,188 psi | 90% | 3199 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 92% | 54,621 psi | 86% | 3199 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 86% | 57,392 psi | 90% | 3159 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,549 psi | 85% | 3038 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 47,456 psi | 74% | 2890 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 45,890 psi | 72% | 2953 fps | 95.8% |
| Accurate High Country | <<locked>> | 80% | 52,228 psi | 82% | 3100 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 80% | 49,545 psi | 78% | 3041 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 80% | 51,517 psi | 81% | 3031 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 46,804 psi | 73% | 2979 fps | 99% |
| ADI AR 2217 | <<locked>> | 80% | 34,925 psi | 55% | 2703 fps | 96.3% |
| ADI AR 2218 | <<locked>> | 90% | 42,917 psi | 67% | 2979 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 32,285 psi | 51% | 2674 fps | 98.2% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,300 psi | 80% | 3022 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,558 psi | 75% | 2979 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,282 psi | 73% | 2904 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,495 psi | 63% | 2851 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 53,127 psi | 83% | 3091 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 44,353 psi | 70% | 2969 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 92% | 44,483 psi | 70% | 2963 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,483 psi | 70% | 2881 fps | 96.2% |
| Bofors RP15 | <<locked>> | 80% | 44,280 psi | 69% | 2910 fps | 99.3% |
| Bofors RP30 | <<locked>> | 80% | 37,826 psi | 59% | 2785 fps | 97.3% |
| Bofors RP5 | <<locked>> | 80% | 47,558 psi | 75% | 2979 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 80% | 38,072 psi | 60% | 2785 fps | 98% |
| Hodgdon H4831 | <<locked>> | 80% | 49,226 psi | 77% | 2972 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,356 psi | 76% | 2956 fps | 98.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 39,595 psi | 62% | 2910 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,514 psi | 45% | 1801 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,734 psi | 78% | 2956 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 80% | 45,600 psi | 71% | 2959 fps | 98.9% |
| IMR 8133 Enduron | <<locked>> | 84% | 34,389 psi | 54% | 2713 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 40,843 psi | 64% | 2762 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 30,168 psi | 47% | 2612 fps | 96.3% |
| Norma MRP | <<locked>> | 80% | 50,734 psi | 80% | 3054 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,238 psi | 72% | 2979 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 80% | 41,597 psi | 65% | 2841 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,312 psi | 46% | 1847 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,088 psi | 61% | 2881 fps | 99.7% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 35,984 psi | 56% | 2762 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 51,938 psi | 81% | 3002 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 51,068 psi | 80% | 3015 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 44,860 psi | 70% | 2907 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,720 psi | 79% | 3009 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 53,069 psi | 83% | 2989 fps | 99.5% |
| Somchem S385 | <<locked>> | 80% | 51,430 psi | 81% | 2982 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,078 psi | 71% | 2854 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 86% | 47,456 psi | 74% | 2927 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 80% | 51,082 psi | 80% | 2986 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,183 psi | 79% | 3054 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 80% | 42,076 psi | 66% | 2864 fps | 97.9% |
| Vihtavuori N568 | <<locked>> | 82% | 39,871 psi | 62% | 2854 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 86% | 43,976 psi | 69% | 2982 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,847 psi | 72% | 2979 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,601 psi | 75% | 2917 fps | 99.7% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 51 powders for .30-378 Weath. Mag. loaded with the .308 | 180gr | Norma PlastSpitz. Hodgdon Retumbo delivers the highest muzzle velocity at 3,241 fps; across all powders the maximum-charge window runs from 2,014 fps to 3,241 fps. Accurate 8700 gives the best case fill at 100 %, and 51 of the 51 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 180.0 gr projectile in 0.308" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, ReloadSwiss RS 14 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.