Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 165gr | Remington PSP Core-Lokt bullet and 50 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>> | 86% | 56,260 psi | 88% | 3146 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 54,346 psi | 85% | 3248 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 84% | 55,201 psi | 87% | 3255 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 84% | 57,159 psi | 90% | 3241 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,927 psi | 88% | 3258 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 94% | 55,071 psi | 86% | 3235 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 98% | 55,637 psi | 87% | 3353 fps | 98.2% |
| ADI AR 2225 | <<locked>> | 96% | 54,375 psi | 85% | 3255 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,695 psi | 89% | 3225 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,434 psi | 88% | 3251 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 54,650 psi | 86% | 3153 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,201 psi | 87% | 3228 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,259 psi | 87% | 3241 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 57,682 psi | 90% | 3330 fps | 98.3% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 57,696 psi | 90% | 3317 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,275 psi | 88% | 3209 fps | 98.2% |
| Bofors RP15 | <<locked>> | 88% | 55,796 psi | 87% | 3238 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 55,056 psi | 86% | 3245 fps | 99.8% |
| Bofors RP5 | <<locked>> | 86% | 56,434 psi | 88% | 3251 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 56,536 psi | 89% | 3258 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 54,636 psi | 86% | 3179 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,508 psi | 90% | 3228 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,421 psi | 90% | 3143 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 54,375 psi | 85% | 3320 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,826 psi | 59% | 2103 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,027 psi | 86% | 3159 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 86% | 54,346 psi | 85% | 3235 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 57,145 psi | 90% | 3294 fps | 99.9% |
| Lovex S071 | <<locked>> | 90% | 54,520 psi | 85% | 3120 fps | 100% |
| Norma 217 | <<locked>> | 98% | 54,766 psi | 86% | 3255 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,550 psi | 89% | 3268 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,724 psi | 87% | 3261 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 88% | 54,186 psi | 85% | 3182 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,870 psi | 61% | 2152 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,419 psi | 87% | 3304 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 54,781 psi | 86% | 3264 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 84% | 57,421 psi | 90% | 3205 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 56,608 psi | 89% | 3219 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,217 psi | 88% | 3219 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 55,332 psi | 87% | 3133 fps | 99.4% |
| Somchem S385 | <<locked>> | 84% | 56,898 psi | 89% | 3186 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,942 psi | 89% | 3173 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,405 psi | 88% | 3192 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 84% | 56,347 psi | 88% | 3182 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,869 psi | 88% | 3268 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 90% | 57,159 psi | 90% | 3261 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 92% | 55,172 psi | 86% | 3271 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 94% | 56,478 psi | 89% | 3337 fps | 97.8% |
| Winchester StaBALL HD | <<locked>> | 86% | 55,216 psi | 87% | 3245 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,826 psi | 89% | 3182 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 45,861 psi | 72% | 2969 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 50,546 psi | 79% | 3176 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 80% | 47,979 psi | 75% | 3114 fps | 97.8% |
| ADI AR 2209 | <<locked>> | 80% | 49,893 psi | 78% | 3110 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 45,252 psi | 71% | 3051 fps | 98.2% |
| ADI AR 2217 | <<locked>> | 82% | 36,071 psi | 57% | 2825 fps | 95.8% |
| ADI AR 2218 | <<locked>> | 94% | 47,877 psi | 75% | 3189 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 31,096 psi | 49% | 2726 fps | 96.7% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,705 psi | 78% | 3104 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,021 psi | 72% | 3058 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,701 psi | 70% | 2982 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,870 psi | 61% | 2920 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,300 psi | 80% | 3173 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 45,948 psi | 72% | 3100 fps | 95.4% |
| Alliant Reloder-50 | <<locked>> | 96% | 49,690 psi | 78% | 3166 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 46,224 psi | 72% | 3015 fps | 95.9% |
| Bofors RP15 | <<locked>> | 80% | 42,743 psi | 67% | 2982 fps | 98.5% |
| Bofors RP30 | <<locked>> | 80% | 36,318 psi | 57% | 2841 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 46,021 psi | 72% | 3058 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 80% | 36,709 psi | 58% | 2844 fps | 96.7% |
| Hodgdon H4831 | <<locked>> | 80% | 47,718 psi | 75% | 3048 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,905 psi | 74% | 3031 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,751 psi | 84% | 3084 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 38,043 psi | 60% | 2966 fps | 98.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,413 psi | 45% | 1883 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,356 psi | 76% | 3035 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 80% | 44,048 psi | 69% | 3031 fps | 98% |
| IMR 8133 Enduron | <<locked>> | 86% | 35,331 psi | 55% | 2831 fps | 95.3% |
| Lovex S071 | <<locked>> | 80% | 39,595 psi | 62% | 2835 fps | 99.5% |
| Norma 217 | <<locked>> | 82% | 30,937 psi | 48% | 2723 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 49,066 psi | 77% | 3133 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 44,411 psi | 70% | 3048 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 80% | 40,001 psi | 63% | 2907 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,167 psi | 46% | 1929 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,565 psi | 59% | 2940 fps | 99% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 40,306 psi | 63% | 2963 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 50,473 psi | 79% | 3081 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 49,443 psi | 77% | 3094 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,095 psi | 77% | 3087 fps | 99.6% |
| Somchem S361 | <<locked>> | 80% | 51,735 psi | 81% | 3071 fps | 98.9% |
| Somchem S385 | <<locked>> | 80% | 49,908 psi | 78% | 3068 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 43,613 psi | 68% | 2927 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 90% | 52,779 psi | 83% | 3127 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 49,414 psi | 77% | 3071 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,544 psi | 76% | 3127 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 80% | 40,567 psi | 64% | 2927 fps | 96.7% |
| Vihtavuori N568 | <<locked>> | 84% | 41,350 psi | 65% | 2982 fps | 95.5% |
| Vihtavuori N570 | <<locked>> | 90% | 48,950 psi | 77% | 3189 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,772 psi | 69% | 3051 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,137 psi | 72% | 2992 fps | 99.2% |
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 | 165gr | Remington PSP Core-Lokt. ADI AR 2218 delivers the highest muzzle velocity at 3,353 fps; across all powders the maximum-charge window runs from 2,103 fps to 3,353 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 165.0 gr projectile in 0.308" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Alliant Reloder-50, Hodgdon TrailBoss 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.