Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 185gr | Lapua D46 bullet and 52 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Vihtavuori N570 and Hodgdon Retumbo.
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% | 54,752 psi | 86% | 2979 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 50,169 psi | 79% | 3005 fps | 97.3% |
| Accurate High Country | <<locked>> | 82% | 56,753 psi | 89% | 3146 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 57,725 psi | 90% | 3156 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 82% | 55,666 psi | 87% | 3068 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 54,462 psi | 85% | 3087 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 53,882 psi | 84% | 3074 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 54,273 psi | 85% | 3196 fps | 98.9% |
| ADI AR 2225 | <<locked>> | 96% | 57,261 psi | 90% | 3156 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 55,883 psi | 88% | 3064 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,332 psi | 87% | 3058 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 55,071 psi | 86% | 3081 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 57,072 psi | 89% | 3038 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 54,041 psi | 85% | 3064 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 56,246 psi | 88% | 3169 fps | 98.8% |
| Alliant Reloder-50 | <<locked>> | 98% | 56,492 psi | 89% | 3166 fps | 98.5% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,752 psi | 86% | 3045 fps | 98.7% |
| Bofors RP15 | <<locked>> | 86% | 54,650 psi | 86% | 3074 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 57,725 psi | 90% | 3146 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 55,071 psi | 86% | 3081 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 55,114 psi | 86% | 3087 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,942 psi | 89% | 3077 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,927 psi | 88% | 3061 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 90% | 57,551 psi | 90% | 3222 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,898 psi | 59% | 1985 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,956 psi | 89% | 3048 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 86% | 56,869 psi | 89% | 3133 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 55,622 psi | 87% | 2999 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 56,275 psi | 88% | 3136 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 56,898 psi | 89% | 3009 fps | 100% |
| Norma 217 | <<locked>> | 96% | 53,795 psi | 84% | 3100 fps | 100% |
| Norma MRP | <<locked>> | 82% | 55,143 psi | 86% | 3094 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 54,244 psi | 85% | 3094 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 56,913 psi | 89% | 3081 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,030 psi | 61% | 2034 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 54,085 psi | 85% | 3136 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 57,595 psi | 90% | 3176 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 82% | 55,985 psi | 88% | 3038 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 55,201 psi | 87% | 3051 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 52,185 psi | 82% | 3022 fps | 97.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,839 psi | 86% | 3045 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 57,232 psi | 90% | 3025 fps | 99.9% |
| Somchem S385 | <<locked>> | 82% | 55,419 psi | 87% | 3015 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,535 psi | 87% | 3005 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,853 psi | 86% | 3035 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 82% | 55,172 psi | 86% | 3015 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 54,462 psi | 85% | 3100 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 55,956 psi | 88% | 3100 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 53,911 psi | 84% | 3110 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 92% | 55,361 psi | 87% | 3179 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 84% | 54,041 psi | 85% | 3074 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 55,158 psi | 86% | 3012 fps | 100% |
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 3100 | <<locked>> | 80% | 47,906 psi | 75% | 2867 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 43,279 psi | 68% | 2871 fps | 95.2% |
| Accurate High Country | <<locked>> | 80% | 53,040 psi | 83% | 3084 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 50,154 psi | 79% | 3022 fps | 99% |
| ADI AR 2209 | <<locked>> | 80% | 51,982 psi | 81% | 3005 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 47,326 psi | 74% | 2959 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 80% | 35,331 psi | 55% | 2687 fps | 96.8% |
| ADI AR 2218 | 108.3 gr | 90% | 43,482 psi | 68% | 2969 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 32,692 psi | 51% | 2661 fps | 98.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 52,272 psi | 82% | 3005 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,779 psi | 81% | 2999 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 48,080 psi | 75% | 2959 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,876 psi | 73% | 2881 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,973 psi | 64% | 2831 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 41,655 psi | 65% | 2881 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 92% | 45,208 psi | 71% | 2953 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,933 psi | 70% | 2858 fps | 96.7% |
| Bofors RP15 | <<locked>> | 80% | 44,715 psi | 70% | 2890 fps | 99.5% |
| Bofors RP30 | <<locked>> | 80% | 38,290 psi | 60% | 2769 fps | 97.8% |
| Bofors RP5 | <<locked>> | 80% | 48,080 psi | 75% | 2959 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 38,508 psi | 60% | 2769 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 80% | 49,676 psi | 78% | 2949 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,834 psi | 77% | 2933 fps | 99.1% |
| Hodgdon Retumbo | 90.8 gr | 80% | 40,089 psi | 63% | 2894 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,485 psi | 45% | 1778 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,154 psi | 79% | 2933 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 80% | 46,122 psi | 72% | 2940 fps | 99.1% |
| IMR 7977 Enduron | <<locked>> | 88% | 52,228 psi | 82% | 2940 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 82% | 32,532 psi | 51% | 2638 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 41,365 psi | 65% | 2743 fps | 100% |
| Norma 217 | <<locked>> | 80% | 30,690 psi | 48% | 2602 fps | 96.9% |
| Norma MRP | <<locked>> | 80% | 51,488 psi | 81% | 3035 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,862 psi | 73% | 2959 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 80% | 42,163 psi | 66% | 2825 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,298 psi | 46% | 1821 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,682 psi | 62% | 2867 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 36,579 psi | 57% | 2749 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 52,504 psi | 82% | 2979 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 51,547 psi | 81% | 2989 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 45,469 psi | 71% | 2894 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 51,198 psi | 80% | 2986 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 53,577 psi | 84% | 2966 fps | 99.6% |
| Somchem S385 | <<locked>> | 80% | 51,880 psi | 81% | 2959 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,527 psi | 71% | 2835 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 47,935 psi | 75% | 2907 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 80% | 51,735 psi | 81% | 2959 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,908 psi | 80% | 3035 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 80% | 42,598 psi | 67% | 2848 fps | 98.2% |
| Vihtavuori N568 | <<locked>> | 80% | 37,681 psi | 59% | 2769 fps | 95.4% |
| Vihtavuori N570 | 101.3 gr | 86% | 44,541 psi | 70% | 2966 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,572 psi | 73% | 2956 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 48,109 psi | 75% | 2894 fps | 99.8% |
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 52 powders for .30-378 Weath. Mag. loaded with the .308 | 185gr | Lapua D46. Hodgdon Retumbo delivers the highest muzzle velocity at 3,222 fps; across all powders the maximum-charge window runs from 1,985 fps to 3,222 fps. Accurate 8700 gives the best case fill at 100 %, and 52 of the 52 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 185.0 gr projectile in 0.308" calls for a 1:12.5 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. ADI AR 2218, Vihtavuori N570, Hodgdon Retumbo rank at the top here: for .30-378 Weath. Mag. with the .308 | 185gr | Lapua D46 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.