Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Winchester FailSafe bullet and 50 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ADI AR 2218 and Vihtavuori N570.
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% | 57,232 psi | 90% | 3051 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 48,530 psi | 76% | 3005 fps | 96.5% |
| Accurate MAGPRO | <<locked>> | 84% | 56,304 psi | 88% | 3166 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 82% | 54,404 psi | 85% | 3081 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 56,855 psi | 89% | 3159 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 56,043 psi | 88% | 3140 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 56,768 psi | 89% | 3274 fps | 99% |
| ADI AR 2225 | <<locked>> | 96% | 55,477 psi | 87% | 3163 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,624 psi | 90% | 3130 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 57,348 psi | 90% | 3153 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,680 psi | 87% | 3054 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 56,188 psi | 88% | 3130 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 56,376 psi | 88% | 3143 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 54,491 psi | 85% | 3173 fps | 98.3% |
| Alliant Reloder-50 | <<locked>> | 98% | 54,636 psi | 86% | 3166 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 57,116 psi | 90% | 3114 fps | 98.8% |
| Bofors RP15 | <<locked>> | 88% | 56,869 psi | 89% | 3146 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 56,057 psi | 88% | 3153 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 57,348 psi | 90% | 3153 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 57,522 psi | 90% | 3159 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 55,695 psi | 87% | 3087 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 54,694 psi | 86% | 3071 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,622 psi | 87% | 3228 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,927 psi | 59% | 2008 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,811 psi | 87% | 3064 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 86% | 55,419 psi | 87% | 3143 fps | 99.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 54,520 psi | 85% | 3143 fps | 99.9% |
| Lovex S071 | <<locked>> | 90% | 55,550 psi | 87% | 3025 fps | 100% |
| Norma 217 | <<locked>> | 98% | 55,883 psi | 88% | 3166 fps | 100% |
| Norma MRP | <<locked>> | 84% | 57,551 psi | 90% | 3169 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,753 psi | 89% | 3166 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 55,259 psi | 87% | 3091 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,899 psi | 61% | 2054 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 56,608 psi | 89% | 3212 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 55,796 psi | 87% | 3179 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 54,810 psi | 86% | 3048 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 57,522 psi | 90% | 3120 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 50,662 psi | 79% | 3022 fps | 96.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 57,159 psi | 90% | 3117 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,101 psi | 88% | 3038 fps | 99.7% |
| Somchem S385 | <<locked>> | 82% | 54,201 psi | 85% | 3031 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,302 psi | 85% | 3018 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 57,232 psi | 90% | 3104 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 84% | 57,421 psi | 90% | 3084 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 56,869 psi | 89% | 3173 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 54,404 psi | 85% | 3107 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 92% | 56,217 psi | 88% | 3182 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 94% | 57,725 psi | 90% | 3251 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 86% | 56,289 psi | 88% | 3146 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 57,725 psi | 90% | 3084 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% | 46,717 psi | 73% | 2877 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 45,136 psi | 71% | 2936 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 80% | 48,863 psi | 77% | 3028 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 80% | 50,763 psi | 80% | 3018 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 46,093 psi | 72% | 2966 fps | 98.9% |
| ADI AR 2217 | <<locked>> | 80% | 34,447 psi | 54% | 2690 fps | 96% |
| ADI AR 2218 | 110.2 gr | 92% | 45,382 psi | 71% | 3038 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 31,734 psi | 50% | 2657 fps | 97.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,604 psi | 79% | 3009 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,862 psi | 73% | 2966 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,687 psi | 72% | 2894 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,755 psi | 62% | 2838 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 52,373 psi | 82% | 3081 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 43,511 psi | 68% | 2953 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 94% | 46,992 psi | 74% | 3018 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,947 psi | 69% | 2864 fps | 96% |
| Bofors RP15 | <<locked>> | 80% | 43,714 psi | 69% | 2900 fps | 99.2% |
| Bofors RP30 | <<locked>> | 80% | 37,159 psi | 58% | 2772 fps | 97.1% |
| Bofors RP5 | <<locked>> | 80% | 46,862 psi | 73% | 2966 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 80% | 37,449 psi | 59% | 2772 fps | 97.8% |
| Hodgdon H4831 | <<locked>> | 80% | 48,530 psi | 76% | 2959 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,688 psi | 75% | 2943 fps | 98.7% |
| Hodgdon Retumbo | 90.4 gr | 80% | 38,870 psi | 61% | 2894 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,471 psi | 45% | 1798 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,110 psi | 77% | 2943 fps | 99% |
| IMR 7828 SSC | <<locked>> | 80% | 44,875 psi | 70% | 2946 fps | 98.7% |
| IMR 8133 Enduron | <<locked>> | 84% | 33,750 psi | 53% | 2700 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 40,306 psi | 63% | 2749 fps | 99.8% |
| Norma 217 | <<locked>> | 80% | 29,646 psi | 46% | 2598 fps | 96% |
| Norma MRP | <<locked>> | 80% | 49,995 psi | 78% | 3041 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 45,498 psi | 71% | 2966 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 80% | 40,944 psi | 64% | 2828 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,269 psi | 46% | 1841 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,450 psi | 60% | 2867 fps | 99.6% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 38,145 psi | 60% | 2822 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 51,401 psi | 81% | 2989 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 80% | 50,473 psi | 79% | 3002 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 47,282 psi | 74% | 2959 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,125 psi | 79% | 2999 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 52,460 psi | 82% | 2976 fps | 99.4% |
| Somchem S385 | <<locked>> | 80% | 50,705 psi | 79% | 2972 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,454 psi | 70% | 2844 fps | 99.6% |
| Vihtavuori N170 | <<locked>> | 88% | 49,995 psi | 78% | 2972 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 50,444 psi | 79% | 2972 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,472 psi | 78% | 3041 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 80% | 41,452 psi | 65% | 2851 fps | 97.7% |
| Vihtavuori N568 | <<locked>> | 82% | 39,247 psi | 62% | 2841 fps | 95.7% |
| Vihtavuori N570 | 103.2 gr | 88% | 46,398 psi | 73% | 3035 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 44,991 psi | 71% | 2966 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,978 psi | 74% | 2904 fps | 99.6% |
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 57 powders for .30-378 Weath. Mag. loaded with the .308 | 180gr | Winchester FailSafe. ADI AR 2218 delivers the highest muzzle velocity at 3,274 fps; across all powders the maximum-charge window runs from 2,008 fps to 3,274 fps. Accurate 8700 gives the best case fill at 100 %, and 57 of the 57 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. Hodgdon Retumbo, ADI AR 2218, Vihtavuori N570 rank at the top here: for .30-378 Weath. Mag. with the .308 | 180gr | Winchester FailSafe they combine a high case fill with complete burn and sit in the upper velocity band. 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.