Load Specifications
Load data in caliber .30-378 Weath. Mag. with .306 | 155gr | Fox Classic Hunter bullet and 67 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 IMR 7828 SSC.
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>> | 90% | 57,116 psi | 90% | 3245 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,377 psi | 90% | 3274 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 55,216 psi | 87% | 3353 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 88% | 56,173 psi | 88% | 3353 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 86% | 54,824 psi | 86% | 3284 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 90% | 57,232 psi | 90% | 3363 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 98% | 55,593 psi | 87% | 3327 fps | 99.6% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,257 psi | 82% | 3353 fps | 96.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,201 psi | 85% | 3346 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 55,158 psi | 86% | 3284 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,984 psi | 86% | 3281 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 54,549 psi | 85% | 3274 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,464 psi | 90% | 3356 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,288 psi | 87% | 3258 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,506 psi | 87% | 3330 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,898 psi | 88% | 3346 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 53,621 psi | 84% | 3340 fps | 96.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 54,273 psi | 85% | 3248 fps | 97.1% |
| Bofors RP15 | <<locked>> | 92% | 56,637 psi | 89% | 3337 fps | 99.8% |
| Bofors RP30 | <<locked>> | 96% | 55,245 psi | 87% | 3337 fps | 99.6% |
| Bofors RP5 | <<locked>> | 90% | 57,464 psi | 90% | 3356 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 96% | 57,232 psi | 90% | 3353 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 88% | 56,246 psi | 88% | 3287 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,230 psi | 87% | 3268 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,129 psi | 86% | 3196 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 54,375 psi | 85% | 3415 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,391 psi | 59% | 2139 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,290 psi | 90% | 3264 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,740 psi | 90% | 3264 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,811 psi | 89% | 3268 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 90% | 55,332 psi | 87% | 3340 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,284 psi | 77% | 3238 fps | 98.7% |
| Lovex S065 | <<locked>> | 82% | 57,305 psi | 90% | 3238 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,724 psi | 87% | 3238 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 54,868 psi | 86% | 3212 fps | 100% |
| Norma 204 | <<locked>> | 82% | 54,882 psi | 86% | 3264 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 50,241 psi | 79% | 3268 fps | 99.9% |
| Norma MRP | <<locked>> | 88% | 57,522 psi | 90% | 3373 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,695 psi | 87% | 3255 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,579 psi | 89% | 3363 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 82% | 54,795 psi | 86% | 3261 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,955 psi | 86% | 3281 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,247 psi | 60% | 2188 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,623 psi | 89% | 3330 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 55,506 psi | 87% | 3402 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 54,766 psi | 86% | 3350 fps | 98.7% |
| Rottweil R 904 | <<locked>> | 86% | 55,579 psi | 87% | 3251 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 86% | 54,027 psi | 85% | 3261 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,305 psi | 90% | 3238 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,724 psi | 87% | 3238 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,362 psi | 88% | 3189 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,551 psi | 90% | 3323 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 57,232 psi | 90% | 3241 fps | 99.1% |
| Somchem S365 | <<locked>> | 84% | 56,985 psi | 89% | 3258 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 54,433 psi | 85% | 3228 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 82% | 57,276 psi | 90% | 3245 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 54,505 psi | 85% | 3212 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 96% | 57,508 psi | 90% | 3284 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 82% | 56,536 psi | 89% | 3251 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,000 psi | 89% | 3287 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 57,014 psi | 89% | 3373 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 94% | 57,696 psi | 90% | 3353 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 96% | 55,434 psi | 87% | 3360 fps | 98.4% |
| Vihtavuori N570 | <<locked>> | 98% | 56,565 psi | 89% | 3422 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,029 psi | 89% | 3189 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 54,926 psi | 86% | 3346 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,447 psi | 85% | 3225 fps | 99.7% |
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% | 40,147 psi | 63% | 2927 fps | 99.1% |
| Accurate 4350 | <<locked>> | 80% | 53,388 psi | 84% | 3212 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 44,309 psi | 69% | 3130 fps | 97.2% |
| Accurate MAGPRO | <<locked>> | 80% | 41,916 psi | 66% | 3061 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 44,657 psi | 70% | 3084 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 80% | 39,885 psi | 63% | 3005 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 88% | 38,943 psi | 61% | 2972 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 98% | 48,385 psi | 76% | 3268 fps | 95% |
| ADI AR 2225 | <<locked>> | 84% | 30,792 psi | 48% | 2785 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,904 psi | 70% | 3081 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,343 psi | 80% | 3222 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,483 psi | 70% | 3074 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,437 psi | 63% | 3012 fps | 97.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,146 psi | 61% | 2956 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,736 psi | 53% | 2867 fps | 98.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,280 psi | 69% | 3133 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 49,414 psi | 77% | 3255 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,645 psi | 75% | 3114 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 37,594 psi | 59% | 2936 fps | 96.2% |
| Bofors RP30 | <<locked>> | 86% | 38,783 psi | 61% | 2986 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 40,437 psi | 63% | 3012 fps | 97.3% |
| Hodgdon H1000 | <<locked>> | 84% | 36,985 psi | 58% | 2927 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 80% | 42,511 psi | 67% | 3012 fps | 96% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,713 psi | 65% | 2995 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,124 psi | 75% | 3081 fps | 100% |
| Hodgdon Retumbo | 92.5 gr | 82% | 35,331 psi | 55% | 2966 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,949 psi | 44% | 1919 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,386 psi | 79% | 3143 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 50,618 psi | 79% | 3150 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,801 psi | 69% | 3012 fps | 96.6% |
| IMR 7828 SSC | 90.1 gr | 80% | 38,508 psi | 60% | 2979 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 92% | 37,144 psi | 58% | 2963 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 53,780 psi | 84% | 3182 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,257 psi | 82% | 3176 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,447 psi | 54% | 2789 fps | 97.8% |
| Norma 204 | <<locked>> | 80% | 51,184 psi | 80% | 3196 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 32,300 psi | 51% | 2844 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 42,859 psi | 67% | 3091 fps | 99% |
| Norma URP | <<locked>> | 80% | 52,098 psi | 82% | 3196 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,421 psi | 60% | 2989 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 51,184 psi | 80% | 3199 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,345 psi | 54% | 2844 fps | 96.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,645 psi | 45% | 1965 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,562 psi | 82% | 3261 fps | 100% |
| ReloadSwiss RS 76 | 96.6 gr | 80% | 32,155 psi | 50% | 2858 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 43,163 psi | 68% | 3114 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 45,571 psi | 71% | 3058 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 80% | 44,034 psi | 69% | 3064 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,780 psi | 84% | 3182 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,257 psi | 82% | 3176 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,605 psi | 82% | 3123 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,700 psi | 68% | 3054 fps | 98.2% |
| Somchem S361 | <<locked>> | 80% | 46,528 psi | 73% | 3041 fps | 97.2% |
| Somchem S365 | <<locked>> | 80% | 49,690 psi | 78% | 3143 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,396 psi | 70% | 3035 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 80% | 53,490 psi | 84% | 3186 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,609 psi | 61% | 2894 fps | 97.4% |
| Vihtavuori N170 | <<locked>> | 94% | 53,505 psi | 84% | 3212 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 52,866 psi | 83% | 3189 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,482 psi | 68% | 3045 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,699 psi | 67% | 3081 fps | 96.1% |
| Vihtavuori N565 | <<locked>> | 84% | 40,538 psi | 64% | 3005 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 90% | 44,309 psi | 69% | 3133 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 96% | 52,533 psi | 82% | 3346 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,171 psi | 83% | 3130 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,767 psi | 58% | 2999 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,901 psi | 64% | 2953 fps | 97.4% |
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 67 powders for .30-378 Weath. Mag. loaded with the .306 | 155gr | Fox Classic Hunter. Vihtavuori N570 delivers the highest muzzle velocity at 3,422 fps; across all powders the maximum-charge window runs from 2,139 fps to 3,422 fps. ADI AR 2218 gives the best case fill at 100 %, and 67 of the 67 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 155.0 gr projectile in 0.306" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, 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, IMR 7828 SSC rank at the top here: for .30-378 Weath. Mag. with the .306 | 155gr | Fox Classic Hunter 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.