Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Sellier & Bellot HPC bullet and 51 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% | 56,652 psi | 89% | 3041 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 47,964 psi | 75% | 2995 fps | 96.3% |
| Accurate MAGPRO | <<locked>> | 84% | 55,753 psi | 87% | 3156 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 84% | 57,682 psi | 90% | 3136 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 56,420 psi | 88% | 3153 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 55,492 psi | 87% | 3133 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 56,144 psi | 88% | 3261 fps | 98.9% |
| ADI AR 2225 | <<locked>> | 96% | 54,882 psi | 86% | 3156 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,232 psi | 90% | 3123 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,927 psi | 89% | 3146 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,259 psi | 87% | 3051 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,796 psi | 87% | 3130 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,738 psi | 87% | 3136 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 54,012 psi | 85% | 3166 fps | 98.2% |
| Alliant Reloder-50 | <<locked>> | 98% | 53,809 psi | 84% | 3153 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,681 psi | 89% | 3110 fps | 98.7% |
| Bofors RP15 | <<locked>> | 88% | 56,304 psi | 88% | 3136 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 55,521 psi | 87% | 3146 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 56,927 psi | 89% | 3146 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 56,956 psi | 89% | 3153 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 55,129 psi | 86% | 3077 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 84% | 54,157 psi | 85% | 3064 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,187 psi | 86% | 3222 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,884 psi | 59% | 2005 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,463 psi | 87% | 3058 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 86% | 54,984 psi | 86% | 3136 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 92% | 57,667 psi | 90% | 3061 fps | 96% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 57,609 psi | 90% | 3196 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 54,984 psi | 86% | 3018 fps | 100% |
| Norma 217 | <<locked>> | 98% | 55,347 psi | 87% | 3159 fps | 100% |
| Norma MRP | <<locked>> | 84% | 57,145 psi | 90% | 3163 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,289 psi | 88% | 3159 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 54,708 psi | 86% | 3081 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,856 psi | 61% | 2051 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,854 psi | 88% | 3202 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 55,085 psi | 86% | 3169 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 82% | 54,418 psi | 85% | 3045 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 57,116 psi | 90% | 3117 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 50,067 psi | 78% | 3012 fps | 96.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,724 psi | 89% | 3110 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 55,637 psi | 87% | 3031 fps | 99.7% |
| Somchem S385 | <<locked>> | 84% | 57,348 psi | 90% | 3081 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 57,508 psi | 90% | 3071 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,811 psi | 89% | 3097 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 84% | 56,985 psi | 89% | 3077 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 56,463 psi | 88% | 3166 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 90% | 57,638 psi | 90% | 3159 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 92% | 55,709 psi | 87% | 3176 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 94% | 56,985 psi | 89% | 3241 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 86% | 55,782 psi | 87% | 3143 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 57,217 psi | 90% | 3081 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% | 46,470 psi | 73% | 2874 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 44,570 psi | 70% | 2927 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 80% | 48,457 psi | 76% | 3022 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 80% | 50,488 psi | 79% | 3012 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 45,687 psi | 72% | 2959 fps | 98.8% |
| ADI AR 2217 | <<locked>> | 80% | 34,142 psi | 54% | 2684 fps | 95.8% |
| ADI AR 2218 | 109.3 gr | 92% | 44,831 psi | 70% | 3028 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 31,415 psi | 49% | 2651 fps | 97.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,343 psi | 79% | 3005 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,456 psi | 73% | 2959 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,223 psi | 71% | 2887 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,465 psi | 62% | 2835 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,735 psi | 81% | 3071 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 43,018 psi | 67% | 2946 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 94% | 46,354 psi | 73% | 3005 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,642 psi | 68% | 2861 fps | 95.9% |
| Bofors RP15 | <<locked>> | 80% | 43,294 psi | 68% | 2894 fps | 99.1% |
| Bofors RP30 | <<locked>> | 80% | 36,912 psi | 58% | 2766 fps | 97% |
| Bofors RP5 | <<locked>> | 80% | 46,456 psi | 73% | 2959 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 80% | 37,101 psi | 58% | 2762 fps | 97.6% |
| Hodgdon H4831 | <<locked>> | 80% | 48,153 psi | 75% | 2953 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,311 psi | 74% | 2936 fps | 98.6% |
| Hodgdon Retumbo | 89.7 gr | 80% | 38,464 psi | 60% | 2887 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,485 psi | 45% | 1798 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,892 psi | 77% | 2940 fps | 99% |
| IMR 7828 SSC | <<locked>> | 80% | 44,454 psi | 70% | 2940 fps | 98.6% |
| IMR 7977 Enduron | <<locked>> | 90% | 54,070 psi | 85% | 3002 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 84% | 33,402 psi | 52% | 2690 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 40,016 psi | 63% | 2746 fps | 99.8% |
| Norma 217 | <<locked>> | 80% | 29,269 psi | 46% | 2592 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 49,574 psi | 78% | 3035 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 45,049 psi | 71% | 2959 fps | 99% |
| Ramshot Magnum | <<locked>> | 80% | 40,567 psi | 64% | 2825 fps | 99.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,283 psi | 46% | 1841 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,927 psi | 59% | 2858 fps | 99.6% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 37,666 psi | 59% | 2812 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 51,010 psi | 80% | 2982 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 80% | 50,038 psi | 78% | 2995 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 46,688 psi | 73% | 2949 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,719 psi | 78% | 2992 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 52,141 psi | 82% | 2972 fps | 99.3% |
| Somchem S385 | <<locked>> | 80% | 50,314 psi | 79% | 2963 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,222 psi | 69% | 2838 fps | 99.6% |
| Vihtavuori N170 | <<locked>> | 88% | 49,574 psi | 78% | 2966 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 80% | 49,995 psi | 78% | 2969 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,066 psi | 77% | 3035 fps | 99% |
| Vihtavuori N565 | <<locked>> | 80% | 41,075 psi | 64% | 2844 fps | 97.6% |
| Vihtavuori N568 | <<locked>> | 82% | 38,870 psi | 61% | 2831 fps | 95.5% |
| Vihtavuori N570 | 102.4 gr | 88% | 45,861 psi | 72% | 3028 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 44,483 psi | 70% | 2959 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,601 psi | 73% | 2897 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 51 powders for .30-378 Weath. Mag. loaded with the .308 | 180gr | Sellier & Bellot HPC. ADI AR 2218 delivers the highest muzzle velocity at 3,261 fps; across all powders the maximum-charge window runs from 2,005 fps to 3,261 fps. Accurate 8700 gives the best case fill at 100 %, and 51 of the 51 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 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, IMR 8133 Enduron 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 | Sellier & Bellot HPC 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.