Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Alaska Bullet Works Kodiak SP SPBC 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% | 57,116 psi | 90% | 3048 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 48,457 psi | 76% | 3002 fps | 96.5% |
| Accurate High Country | <<locked>> | 82% | 55,230 psi | 87% | 3156 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 84% | 56,231 psi | 88% | 3163 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 82% | 54,302 psi | 85% | 3077 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 56,913 psi | 89% | 3159 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 55,941 psi | 88% | 3140 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 56,681 psi | 89% | 3271 fps | 99% |
| ADI AR 2225 | <<locked>> | 96% | 55,376 psi | 87% | 3159 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,725 psi | 90% | 3127 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 57,435 psi | 90% | 3153 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,593 psi | 87% | 3051 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 56,304 psi | 88% | 3133 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 56,260 psi | 88% | 3140 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 54,418 psi | 85% | 3173 fps | 98.3% |
| Alliant Reloder-50 | <<locked>> | 98% | 54,534 psi | 85% | 3163 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 57,058 psi | 89% | 3117 fps | 98.8% |
| Bofors RP15 | <<locked>> | 88% | 56,797 psi | 89% | 3143 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 55,999 psi | 88% | 3150 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 57,435 psi | 90% | 3153 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 57,595 psi | 90% | 3159 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 55,593 psi | 87% | 3084 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 54,592 psi | 86% | 3068 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,506 psi | 87% | 3225 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,956 psi | 59% | 2008 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,738 psi | 87% | 3061 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 86% | 55,332 psi | 87% | 3140 fps | 99.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 54,476 psi | 85% | 3143 fps | 99.9% |
| Lovex S071 | <<locked>> | 90% | 55,477 psi | 87% | 3025 fps | 100% |
| Norma 217 | <<locked>> | 98% | 55,811 psi | 87% | 3166 fps | 100% |
| Norma MRP | <<locked>> | 84% | 57,609 psi | 90% | 3169 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,811 psi | 89% | 3166 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 55,172 psi | 86% | 3087 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,943 psi | 61% | 2054 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 56,536 psi | 89% | 3212 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 55,695 psi | 87% | 3179 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 54,708 psi | 86% | 3048 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 57,450 psi | 90% | 3120 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 50,575 psi | 79% | 3018 fps | 96.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 57,072 psi | 89% | 3117 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,014 psi | 88% | 3035 fps | 99.7% |
| Somchem S385 | <<locked>> | 82% | 54,143 psi | 85% | 3028 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,201 psi | 85% | 3018 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 57,203 psi | 90% | 3100 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 84% | 57,305 psi | 90% | 3081 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 56,927 psi | 89% | 3176 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 54,331 psi | 85% | 3104 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 92% | 56,144 psi | 88% | 3182 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 94% | 57,624 psi | 90% | 3248 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 86% | 56,420 psi | 88% | 3150 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 57,667 psi | 90% | 3084 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 46,775 psi | 73% | 2881 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 45,063 psi | 71% | 2936 fps | 95.5% |
| Accurate High Country | <<locked>> | 80% | 51,576 psi | 81% | 3091 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 80% | 48,762 psi | 76% | 3025 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 80% | 50,850 psi | 80% | 3018 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 46,021 psi | 72% | 2963 fps | 98.9% |
| ADI AR 2217 | <<locked>> | 80% | 34,403 psi | 54% | 2690 fps | 96% |
| ADI AR 2218 | <<locked>> | 92% | 45,295 psi | 71% | 3035 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 31,778 psi | 50% | 2661 fps | 98% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,662 psi | 79% | 3009 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,789 psi | 73% | 2966 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,571 psi | 71% | 2890 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,784 psi | 62% | 2838 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 52,257 psi | 82% | 3077 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 43,424 psi | 68% | 2953 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 94% | 46,905 psi | 74% | 3015 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,019 psi | 69% | 2867 fps | 96% |
| Bofors RP15 | <<locked>> | 80% | 43,613 psi | 68% | 2900 fps | 99.1% |
| Bofors RP30 | <<locked>> | 80% | 37,202 psi | 58% | 2772 fps | 97.1% |
| Bofors RP5 | <<locked>> | 80% | 46,789 psi | 73% | 2966 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 80% | 37,362 psi | 59% | 2769 fps | 97.7% |
| Hodgdon H4831 | <<locked>> | 80% | 48,472 psi | 76% | 2959 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,601 psi | 75% | 2943 fps | 98.7% |
| Hodgdon Retumbo | <<locked>> | 80% | 38,914 psi | 61% | 2894 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,485 psi | 45% | 1798 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,168 psi | 77% | 2943 fps | 99% |
| IMR 7828 SSC | <<locked>> | 80% | 44,947 psi | 70% | 2946 fps | 98.7% |
| IMR 8133 Enduron | <<locked>> | 84% | 33,692 psi | 53% | 2697 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 40,350 psi | 63% | 2753 fps | 99.8% |
| Norma 217 | <<locked>> | 80% | 29,573 psi | 46% | 2598 fps | 96% |
| Norma MRP | <<locked>> | 80% | 50,038 psi | 78% | 3041 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 45,382 psi | 71% | 2963 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 80% | 40,843 psi | 64% | 2828 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,298 psi | 46% | 1841 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,348 psi | 60% | 2864 fps | 99.6% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 38,087 psi | 60% | 2818 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 51,314 psi | 80% | 2989 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 80% | 50,386 psi | 79% | 3002 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 47,195 psi | 74% | 2956 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,053 psi | 78% | 2995 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 52,402 psi | 82% | 2976 fps | 99.4% |
| Somchem S385 | <<locked>> | 80% | 50,647 psi | 79% | 2969 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,498 psi | 70% | 2844 fps | 99.6% |
| Vihtavuori N170 | <<locked>> | 88% | 50,096 psi | 79% | 2976 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 80% | 50,343 psi | 79% | 2972 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,530 psi | 78% | 3041 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 80% | 41,365 psi | 65% | 2851 fps | 97.6% |
| Vihtavuori N568 | <<locked>> | 82% | 39,175 psi | 61% | 2838 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 88% | 46,456 psi | 73% | 3038 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 44,904 psi | 70% | 2966 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,876 psi | 73% | 2900 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 | Alaska Bullet Works Kodiak SP SPBC. 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.