Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Swift Scirocco 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, ReloadSwiss RS 76 and ADI AR 2218.
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% | 55,767 psi | 87% | 3025 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 54,911 psi | 86% | 3140 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 84% | 56,768 psi | 89% | 3117 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,521 psi | 87% | 3136 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 54,462 psi | 85% | 3114 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 54,998 psi | 86% | 3238 fps | 98.6% |
| ADI AR 2225 | <<locked>> | 98% | 57,595 psi | 90% | 3199 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,347 psi | 88% | 3107 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,057 psi | 88% | 3133 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 54,302 psi | 85% | 3035 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 54,708 psi | 86% | 3114 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,766 psi | 86% | 3120 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,942 psi | 89% | 3219 fps | 98.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,768 psi | 89% | 3205 fps | 98.2% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,883 psi | 88% | 3094 fps | 98.6% |
| Bofors RP15 | <<locked>> | 88% | 55,434 psi | 87% | 3123 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 54,520 psi | 85% | 3130 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 56,057 psi | 88% | 3133 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 55,869 psi | 88% | 3136 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 54,462 psi | 85% | 3064 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,159 psi | 90% | 3110 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,116 psi | 90% | 3015 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 53,983 psi | 85% | 3205 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,782 psi | 59% | 1998 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 54,679 psi | 86% | 3041 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 86% | 54,070 psi | 85% | 3120 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,463 psi | 88% | 3176 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 57,653 psi | 90% | 3054 fps | 100% |
| Norma 217 | <<locked>> | 98% | 54,099 psi | 85% | 3140 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,202 psi | 88% | 3146 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,158 psi | 86% | 3140 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 88% | 53,708 psi | 84% | 3068 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,885 psi | 61% | 2047 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 54,737 psi | 86% | 3186 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 53,969 psi | 85% | 3150 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 84% | 57,159 psi | 90% | 3087 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 84% | 56,202 psi | 88% | 3100 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 49,023 psi | 77% | 2992 fps | 96.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,825 psi | 87% | 3094 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,882 psi | 86% | 3018 fps | 99.6% |
| Somchem S385 | <<locked>> | 84% | 56,478 psi | 89% | 3064 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,521 psi | 89% | 3051 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 55,840 psi | 88% | 3077 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 84% | 55,970 psi | 88% | 3061 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,579 psi | 87% | 3150 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 90% | 56,652 psi | 89% | 3146 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 92% | 54,549 psi | 85% | 3153 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 94% | 55,825 psi | 87% | 3222 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 86% | 54,563 psi | 86% | 3127 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,376 psi | 88% | 3064 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% | 45,614 psi | 71% | 2858 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 47,587 psi | 75% | 3002 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 80% | 49,748 psi | 78% | 2999 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 44,962 psi | 70% | 2943 fps | 98.6% |
| ADI AR 2217 | <<locked>> | 80% | 33,547 psi | 53% | 2664 fps | 95.4% |
| ADI AR 2218 | 107.7 gr | 92% | 43,961 psi | 69% | 3005 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 30,864 psi | 48% | 2635 fps | 97.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,472 psi | 78% | 2986 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,745 psi | 72% | 2946 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,440 psi | 70% | 2874 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,711 psi | 61% | 2818 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,763 psi | 80% | 3058 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 45,368 psi | 71% | 2999 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 94% | 45,382 psi | 71% | 2986 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,033 psi | 67% | 2844 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 42,569 psi | 67% | 2877 fps | 98.9% |
| Bofors RP30 | <<locked>> | 80% | 36,100 psi | 57% | 2746 fps | 96.6% |
| Bofors RP5 | <<locked>> | 80% | 45,745 psi | 72% | 2946 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 80% | 36,463 psi | 57% | 2746 fps | 97.3% |
| Hodgdon H4831 | <<locked>> | 80% | 47,485 psi | 74% | 2940 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,601 psi | 73% | 2920 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,563 psi | 84% | 2966 fps | 100% |
| Hodgdon Retumbo | 88.4 gr | 80% | 37,768 psi | 59% | 2864 fps | 98.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,384 psi | 44% | 1788 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,240 psi | 76% | 2923 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 80% | 43,714 psi | 69% | 2923 fps | 98.4% |
| IMR 8133 Enduron | <<locked>> | 86% | 35,056 psi | 55% | 2736 fps | 96.1% |
| Lovex S071 | <<locked>> | 80% | 39,407 psi | 62% | 2733 fps | 99.7% |
| Norma 217 | <<locked>> | 80% | 28,631 psi | 45% | 2572 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 48,805 psi | 76% | 3022 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 44,135 psi | 69% | 2940 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 80% | 39,755 psi | 62% | 2805 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,182 psi | 46% | 1831 fps | 100% |
| ReloadSwiss RS 76 | 94.6 gr | 80% | 37,159 psi | 58% | 2841 fps | 99.4% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 36,927 psi | 58% | 2792 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 50,299 psi | 79% | 2969 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 80% | 49,298 psi | 77% | 2979 fps | 99.8% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 45,803 psi | 72% | 2930 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,965 psi | 77% | 2976 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 51,416 psi | 81% | 2956 fps | 99.2% |
| Somchem S385 | <<locked>> | 80% | 49,617 psi | 78% | 2949 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 43,410 psi | 68% | 2822 fps | 99.4% |
| Vihtavuori N170 | <<locked>> | 88% | 48,762 psi | 76% | 2949 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 49,153 psi | 77% | 2953 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,341 psi | 76% | 3018 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 80% | 40,248 psi | 63% | 2825 fps | 97.2% |
| Vihtavuori N568 | <<locked>> | 82% | 38,101 psi | 60% | 2815 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 88% | 44,904 psi | 70% | 3005 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,424 psi | 68% | 2943 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,919 psi | 72% | 2884 fps | 99.5% |
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 58 powders for .30-378 Weath. Mag. loaded with the .308 | 180gr | Swift Scirocco. ADI AR 2218 delivers the highest muzzle velocity at 3,238 fps; across all powders the maximum-charge window runs from 1,998 fps to 3,238 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 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Alliant Reloder-50, Hodgdon TrailBoss 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, ReloadSwiss RS 76, ADI AR 2218 rank at the top here: for .30-378 Weath. Mag. with the .308 | 180gr | Swift Scirocco 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.