Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Speer TBBC 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>> | 86% | 57,261 psi | 90% | 3051 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 48,704 psi | 76% | 3009 fps | 96.6% |
| Accurate High Country | <<locked>> | 82% | 55,376 psi | 87% | 3156 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 84% | 56,362 psi | 88% | 3166 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 82% | 54,447 psi | 85% | 3084 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 57,043 psi | 89% | 3163 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 56,231 psi | 88% | 3143 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 56,797 psi | 89% | 3271 fps | 99% |
| ADI AR 2225 | <<locked>> | 96% | 55,521 psi | 87% | 3163 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,653 psi | 90% | 3130 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 57,537 psi | 90% | 3156 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,738 psi | 87% | 3054 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 56,434 psi | 88% | 3136 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 56,405 psi | 88% | 3143 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 54,679 psi | 86% | 3176 fps | 98.4% |
| Alliant Reloder-50 | <<locked>> | 98% | 54,665 psi | 86% | 3163 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 57,145 psi | 90% | 3117 fps | 98.8% |
| Bofors RP15 | <<locked>> | 88% | 56,927 psi | 89% | 3146 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 56,289 psi | 88% | 3156 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 57,537 psi | 90% | 3156 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 57,725 psi | 90% | 3163 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 55,724 psi | 87% | 3087 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 54,723 psi | 86% | 3071 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,883 psi | 88% | 3232 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,869 psi | 59% | 2008 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,854 psi | 88% | 3064 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 86% | 55,477 psi | 87% | 3143 fps | 99.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 54,592 psi | 86% | 3143 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 55,622 psi | 87% | 3025 fps | 100% |
| Norma 217 | <<locked>> | 98% | 55,927 psi | 88% | 3166 fps | 100% |
| Norma MRP | <<locked>> | 82% | 53,795 psi | 84% | 3107 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,956 psi | 89% | 3169 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 55,303 psi | 87% | 3091 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,972 psi | 61% | 2054 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 56,652 psi | 89% | 3212 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 55,825 psi | 87% | 3179 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 54,839 psi | 86% | 3048 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 57,595 psi | 90% | 3123 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 50,705 psi | 79% | 3022 fps | 96.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 57,217 psi | 90% | 3117 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,130 psi | 88% | 3038 fps | 99.7% |
| Somchem S385 | <<locked>> | 82% | 54,230 psi | 85% | 3031 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,331 psi | 85% | 3018 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 57,450 psi | 90% | 3107 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 84% | 57,464 psi | 90% | 3084 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 57,072 psi | 89% | 3176 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 54,447 psi | 85% | 3107 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 92% | 56,246 psi | 88% | 3182 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 94% | 57,740 psi | 90% | 3251 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 86% | 56,550 psi | 89% | 3150 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 53,954 psi | 85% | 3025 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 46,804 psi | 73% | 2881 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 45,165 psi | 71% | 2940 fps | 95.5% |
| Accurate High Country | <<locked>> | 80% | 51,735 psi | 81% | 3091 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 80% | 48,892 psi | 77% | 3028 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 80% | 50,966 psi | 80% | 3022 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 46,137 psi | 72% | 2966 fps | 98.9% |
| ADI AR 2217 | <<locked>> | 80% | 34,519 psi | 54% | 2690 fps | 96% |
| ADI AR 2218 | <<locked>> | 92% | 45,426 psi | 71% | 3041 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 31,763 psi | 50% | 2661 fps | 98% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,633 psi | 79% | 3009 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,920 psi | 74% | 2966 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,730 psi | 72% | 2894 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,929 psi | 63% | 2841 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 52,402 psi | 82% | 3081 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 43,540 psi | 68% | 2956 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 94% | 47,036 psi | 74% | 3018 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,976 psi | 69% | 2867 fps | 96% |
| Bofors RP15 | <<locked>> | 80% | 43,743 psi | 69% | 2904 fps | 99.2% |
| Bofors RP30 | <<locked>> | 80% | 37,217 psi | 58% | 2772 fps | 97.1% |
| Bofors RP5 | <<locked>> | 80% | 46,920 psi | 74% | 2966 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 80% | 37,478 psi | 59% | 2772 fps | 97.8% |
| Hodgdon H4831 | <<locked>> | 80% | 48,602 psi | 76% | 2959 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,732 psi | 75% | 2943 fps | 98.7% |
| Hodgdon Retumbo | <<locked>> | 80% | 38,914 psi | 61% | 2894 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,427 psi | 45% | 1798 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,269 psi | 77% | 2946 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 80% | 44,918 psi | 70% | 2946 fps | 98.7% |
| IMR 8133 Enduron | <<locked>> | 84% | 33,779 psi | 53% | 2700 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 40,466 psi | 63% | 2756 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 29,689 psi | 47% | 2598 fps | 96% |
| Norma MRP | <<locked>> | 80% | 50,183 psi | 79% | 3045 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 45,527 psi | 71% | 2966 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 80% | 40,973 psi | 64% | 2828 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,225 psi | 46% | 1841 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,479 psi | 60% | 2871 fps | 99.7% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 38,189 psi | 60% | 2822 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 51,459 psi | 81% | 2989 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 80% | 50,517 psi | 79% | 3002 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 47,268 psi | 74% | 2956 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,169 psi | 79% | 2999 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 52,518 psi | 82% | 2979 fps | 99.4% |
| Somchem S385 | <<locked>> | 80% | 50,778 psi | 80% | 2972 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,483 psi | 70% | 2844 fps | 99.6% |
| Vihtavuori N170 | <<locked>> | 88% | 50,198 psi | 79% | 2976 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 80% | 50,488 psi | 79% | 2976 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,661 psi | 78% | 3045 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 80% | 41,481 psi | 65% | 2851 fps | 97.7% |
| Vihtavuori N568 | <<locked>> | 82% | 39,291 psi | 62% | 2841 fps | 95.7% |
| Vihtavuori N570 | <<locked>> | 88% | 46,572 psi | 73% | 3041 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,078 psi | 71% | 2966 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,007 psi | 74% | 2904 fps | 99.6% |
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 | Speer TBBC. ADI AR 2218 delivers the highest muzzle velocity at 3,271 fps; across all powders the maximum-charge window runs from 2,008 fps to 3,271 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 1:13.0 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, 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.