Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 165gr | RWS Speed Tip Professional 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% | 57,000 psi | 89% | 3159 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 56,130 psi | 88% | 3271 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 84% | 54,491 psi | 85% | 3196 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 88% | 56,724 psi | 89% | 3271 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 96% | 55,492 psi | 87% | 3241 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 56,101 psi | 88% | 3360 fps | 98.1% |
| ADI AR 2225 | <<locked>> | 98% | 54,447 psi | 85% | 3264 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,740 psi | 90% | 3241 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,174 psi | 90% | 3264 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,259 psi | 87% | 3169 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,506 psi | 87% | 3241 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,912 psi | 88% | 3258 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 53,737 psi | 84% | 3264 fps | 97.4% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 53,534 psi | 84% | 3251 fps | 96.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,203 psi | 90% | 3222 fps | 98.2% |
| Bofors RP15 | <<locked>> | 90% | 56,550 psi | 89% | 3251 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 55,390 psi | 87% | 3255 fps | 99.8% |
| Bofors RP5 | <<locked>> | 88% | 57,174 psi | 90% | 3264 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 57,116 psi | 90% | 3268 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 55,811 psi | 87% | 3196 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 86% | 54,650 psi | 86% | 3179 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 54,694 psi | 86% | 3100 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 54,723 psi | 86% | 3333 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,739 psi | 59% | 2083 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,579 psi | 89% | 3169 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,363 psi | 90% | 3173 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,173 psi | 88% | 3176 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 88% | 55,158 psi | 86% | 3251 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,476 psi | 84% | 3238 fps | 99.6% |
| Lovex S071 | <<locked>> | 92% | 55,158 psi | 86% | 3133 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,578 psi | 86% | 3264 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,406 psi | 90% | 3281 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,463 psi | 88% | 3274 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 90% | 54,824 psi | 86% | 3192 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,667 psi | 61% | 2133 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,521 psi | 87% | 3317 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,955 psi | 86% | 3274 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 84% | 54,926 psi | 86% | 3159 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 86% | 57,609 psi | 90% | 3238 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,203 psi | 90% | 3232 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,492 psi | 89% | 3150 fps | 99.3% |
| Somchem S365 | <<locked>> | 82% | 56,782 psi | 89% | 3163 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 54,259 psi | 85% | 3140 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 54,128 psi | 85% | 3123 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 57,159 psi | 90% | 3202 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 86% | 57,072 psi | 89% | 3196 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,782 psi | 89% | 3284 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 90% | 53,983 psi | 85% | 3209 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 94% | 55,521 psi | 87% | 3281 fps | 98.8% |
| Vihtavuori N570 | <<locked>> | 96% | 56,681 psi | 89% | 3343 fps | 97.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 55,245 psi | 87% | 3258 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 53,983 psi | 85% | 3133 fps | 99.8% |
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% | 43,540 psi | 68% | 2923 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 80% | 45,194 psi | 71% | 3058 fps | 96.9% |
| ADI AR 2209 | <<locked>> | 80% | 47,529 psi | 74% | 3068 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 80% | 42,830 psi | 67% | 2999 fps | 97.4% |
| ADI AR 2217 | <<locked>> | 84% | 36,535 psi | 57% | 2838 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 96% | 48,385 psi | 76% | 3199 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 29,298 psi | 46% | 2667 fps | 95.4% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,442 psi | 74% | 3058 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,584 psi | 68% | 3005 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,351 psi | 66% | 2943 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,593 psi | 57% | 2871 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,095 psi | 75% | 3123 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 46,108 psi | 72% | 3114 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 98% | 49,472 psi | 78% | 3169 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 47,166 psi | 74% | 3031 fps | 95.9% |
| Bofors RP15 | <<locked>> | 80% | 40,495 psi | 63% | 2933 fps | 97.8% |
| Bofors RP30 | <<locked>> | 82% | 36,608 psi | 57% | 2858 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 43,584 psi | 68% | 3005 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 80% | 34,708 psi | 54% | 2792 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 80% | 45,310 psi | 71% | 2999 fps | 97.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,628 psi | 70% | 2982 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,314 psi | 80% | 3048 fps | 100% |
| Hodgdon Retumbo | 89.9 gr | 80% | 35,766 psi | 56% | 2907 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,253 psi | 44% | 1867 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,127 psi | 83% | 3110 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,751 psi | 84% | 3117 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,311 psi | 73% | 2989 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 80% | 41,539 psi | 65% | 2976 fps | 97.1% |
| IMR 8133 Enduron | <<locked>> | 88% | 35,317 psi | 55% | 2841 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 37,434 psi | 59% | 2785 fps | 99% |
| Norma 217 | <<locked>> | 84% | 30,937 psi | 48% | 2733 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 46,369 psi | 73% | 3084 fps | 99.8% |
| Ramshot Grand | <<locked>> | 80% | 41,669 psi | 65% | 2992 fps | 97.5% |
| Ramshot Magnum | <<locked>> | 80% | 37,608 psi | 59% | 2854 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,008 psi | 45% | 1909 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 35,099 psi | 55% | 2877 fps | 98.2% |
| ReloadSwiss RS 80 | 104.2 gr | 86% | 40,408 psi | 63% | 2976 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 48,254 psi | 76% | 3035 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 80% | 47,021 psi | 74% | 3045 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,717 psi | 73% | 3041 fps | 99.2% |
| Somchem S361 | <<locked>> | 80% | 49,342 psi | 77% | 3022 fps | 98.3% |
| Somchem S365 | <<locked>> | 80% | 53,113 psi | 83% | 3110 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,543 psi | 75% | 3022 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 80% | 41,524 psi | 65% | 2884 fps | 98.6% |
| Vihtavuori N170 | <<locked>> | 92% | 53,447 psi | 84% | 3136 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 80% | 46,847 psi | 73% | 3025 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,992 psi | 72% | 3077 fps | 97.7% |
| Vihtavuori N565 | <<locked>> | 80% | 38,189 psi | 60% | 2874 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 86% | 41,553 psi | 65% | 2995 fps | 95.4% |
| Vihtavuori N570 | 107.3 gr | 92% | 49,110 psi | 77% | 3199 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,625 psi | 64% | 3002 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,758 psi | 69% | 2943 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 | RWS Speed Tip Professional. ADI AR 2218 delivers the highest muzzle velocity at 3,360 fps; across all powders the maximum-charge window runs from 2,083 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 1:12.0 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 | RWS Speed Tip Professional 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.