Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 165gr | Swift Scirocco bullet and 52 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 80 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>> | 88% | 56,811 psi | 89% | 3156 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 55,941 psi | 88% | 3271 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 84% | 54,288 psi | 85% | 3192 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 56,521 psi | 89% | 3268 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 96% | 55,317 psi | 87% | 3241 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,956 psi | 88% | 3360 fps | 98% |
| ADI AR 2225 | <<locked>> | 98% | 54,259 psi | 85% | 3261 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,537 psi | 90% | 3241 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,971 psi | 89% | 3261 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,071 psi | 86% | 3166 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,303 psi | 87% | 3238 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,695 psi | 87% | 3255 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,624 psi | 90% | 3333 fps | 98.1% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 53,200 psi | 83% | 3241 fps | 96.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,087 psi | 89% | 3219 fps | 98.1% |
| Bofors RP15 | <<locked>> | 90% | 56,347 psi | 88% | 3248 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 55,172 psi | 86% | 3251 fps | 99.8% |
| Bofors RP5 | <<locked>> | 88% | 56,971 psi | 89% | 3261 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 56,753 psi | 89% | 3261 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 55,622 psi | 87% | 3196 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 86% | 54,621 psi | 86% | 3176 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 54,607 psi | 86% | 3100 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 54,491 psi | 85% | 3330 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,608 psi | 59% | 2080 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,550 psi | 89% | 3166 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,319 psi | 90% | 3169 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,985 psi | 88% | 3173 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 88% | 54,955 psi | 86% | 3248 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,258 psi | 83% | 3232 fps | 99.6% |
| Lovex S071 | <<locked>> | 92% | 54,955 psi | 86% | 3130 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,360 psi | 85% | 3258 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,203 psi | 90% | 3281 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,028 psi | 88% | 3268 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 90% | 54,592 psi | 86% | 3192 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,667 psi | 61% | 2129 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,347 psi | 87% | 3317 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,766 psi | 86% | 3271 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 84% | 54,926 psi | 86% | 3159 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 86% | 57,392 psi | 90% | 3235 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,000 psi | 89% | 3228 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,333 psi | 88% | 3146 fps | 99.3% |
| Somchem S365 | <<locked>> | 82% | 56,710 psi | 89% | 3163 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 54,056 psi | 85% | 3136 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,740 psi | 90% | 3182 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 57,043 psi | 89% | 3202 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 86% | 56,840 psi | 89% | 3192 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,579 psi | 89% | 3281 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 92% | 57,595 psi | 90% | 3271 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 94% | 55,201 psi | 87% | 3274 fps | 98.8% |
| Vihtavuori N570 | <<locked>> | 96% | 56,536 psi | 89% | 3343 fps | 97.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 54,998 psi | 86% | 3255 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,711 psi | 90% | 3196 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% | 43,352 psi | 68% | 2920 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 80% | 45,020 psi | 71% | 3054 fps | 96.9% |
| ADI AR 2209 | <<locked>> | 80% | 47,326 psi | 74% | 3061 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 80% | 42,670 psi | 67% | 2995 fps | 97.3% |
| ADI AR 2217 | <<locked>> | 84% | 36,492 psi | 57% | 2841 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 96% | 48,109 psi | 75% | 3196 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 29,167 psi | 46% | 2664 fps | 95.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,268 psi | 74% | 3054 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,424 psi | 68% | 3002 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,163 psi | 66% | 2940 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,405 psi | 57% | 2867 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,877 psi | 75% | 3120 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 45,934 psi | 72% | 3107 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 98% | 49,342 psi | 77% | 3169 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 47,021 psi | 74% | 3028 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 40,437 psi | 63% | 2933 fps | 97.8% |
| Bofors RP30 | <<locked>> | 82% | 36,550 psi | 57% | 2854 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 43,424 psi | 68% | 3002 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 80% | 34,548 psi | 54% | 2789 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 80% | 45,266 psi | 71% | 2995 fps | 97.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,440 psi | 70% | 2979 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,111 psi | 80% | 3045 fps | 100% |
| Hodgdon Retumbo | 89.6 gr | 80% | 35,607 psi | 56% | 2904 fps | 97.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,239 psi | 44% | 1864 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,910 psi | 83% | 3104 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,563 psi | 84% | 3110 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,151 psi | 72% | 2986 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 80% | 41,365 psi | 65% | 2976 fps | 97% |
| IMR 8133 Enduron | <<locked>> | 88% | 35,186 psi | 55% | 2838 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 37,391 psi | 59% | 2785 fps | 99% |
| Norma 217 | <<locked>> | 84% | 30,893 psi | 48% | 2733 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 46,151 psi | 72% | 3081 fps | 99.7% |
| Ramshot Grand | <<locked>> | 80% | 41,452 psi | 65% | 2986 fps | 97.5% |
| Ramshot Magnum | <<locked>> | 80% | 37,420 psi | 59% | 2851 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,993 psi | 45% | 1909 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,954 psi | 55% | 2877 fps | 98.1% |
| ReloadSwiss RS 80 | 103.9 gr | 86% | 40,205 psi | 63% | 2969 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 48,225 psi | 76% | 3035 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 80% | 46,847 psi | 73% | 3041 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,499 psi | 73% | 3038 fps | 99.1% |
| Somchem S361 | <<locked>> | 80% | 49,182 psi | 77% | 3022 fps | 98.3% |
| Somchem S365 | <<locked>> | 80% | 52,866 psi | 83% | 3104 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,355 psi | 74% | 3015 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 80% | 41,336 psi | 65% | 2881 fps | 98.6% |
| Vihtavuori N170 | <<locked>> | 92% | 53,316 psi | 84% | 3133 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 46,760 psi | 73% | 3025 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,803 psi | 72% | 3071 fps | 97.7% |
| Vihtavuori N565 | <<locked>> | 80% | 38,043 psi | 60% | 2871 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 86% | 41,394 psi | 65% | 2992 fps | 95.3% |
| Vihtavuori N570 | 107 gr | 92% | 48,936 psi | 77% | 3196 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,364 psi | 63% | 2999 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,714 psi | 69% | 2940 fps | 98.6% |
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 52 powders for .30-378 Weath. Mag. loaded with the .308 | 165gr | Swift Scirocco. ADI AR 2218 delivers the highest muzzle velocity at 3,360 fps; across all powders the maximum-charge window runs from 2,080 fps to 3,360 fps. ADI AR 2218 gives the best case fill at 100 %, and 52 of the 52 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 165.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, 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 80, Vihtavuori N570 rank at the top here: for .30-378 Weath. Mag. with the .308 | 165gr | Swift Scirocco 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.