Load Specifications
Load data in caliber .30-378 Weath. Mag. with .306 | 160gr | AERO SB,- smax:17.9 bullet and 61 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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% | 54,056 psi | 85% | 3156 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 56,173 psi | 88% | 3330 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 88% | 57,203 psi | 90% | 3333 fps | 99% |
| ADI AR 2209 | <<locked>> | 86% | 55,811 psi | 87% | 3258 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 54,128 psi | 85% | 3268 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 98% | 56,695 psi | 89% | 3304 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 53,243 psi | 83% | 3340 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,230 psi | 87% | 3320 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 55,941 psi | 88% | 3255 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,912 psi | 88% | 3251 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,332 psi | 87% | 3248 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 54,505 psi | 85% | 3261 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 56,217 psi | 88% | 3225 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,594 psi | 89% | 3301 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 57,014 psi | 89% | 3320 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 54,737 psi | 86% | 3323 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,085 psi | 86% | 3225 fps | 97.5% |
| Bofors RP15 | <<locked>> | 92% | 57,580 psi | 90% | 3314 fps | 99.9% |
| Bofors RP30 | <<locked>> | 96% | 56,304 psi | 88% | 3314 fps | 99.8% |
| Bofors RP5 | <<locked>> | 88% | 54,505 psi | 85% | 3261 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 94% | 54,317 psi | 85% | 3264 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 88% | 57,145 psi | 90% | 3261 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,101 psi | 88% | 3245 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,898 psi | 88% | 3163 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,550 psi | 87% | 3392 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,492 psi | 59% | 2110 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 54,549 psi | 85% | 3176 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 54,984 psi | 86% | 3179 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,566 psi | 90% | 3241 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 90% | 56,318 psi | 88% | 3314 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,386 psi | 79% | 3222 fps | 99.1% |
| Lovex S070 | <<locked>> | 82% | 56,579 psi | 89% | 3209 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 55,738 psi | 87% | 3186 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,622 psi | 87% | 3235 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 51,256 psi | 80% | 3248 fps | 100% |
| Norma MRP | <<locked>> | 86% | 54,549 psi | 85% | 3278 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,579 psi | 89% | 3225 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 57,725 psi | 90% | 3340 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 55,535 psi | 87% | 3232 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,115 psi | 88% | 3258 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,348 psi | 60% | 2156 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,551 psi | 90% | 3301 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 56,666 psi | 89% | 3379 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,869 psi | 88% | 3333 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 86% | 56,463 psi | 88% | 3228 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 86% | 55,013 psi | 86% | 3238 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 82% | 56,579 psi | 89% | 3209 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,971 psi | 89% | 3156 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 54,621 psi | 86% | 3232 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 54,215 psi | 85% | 3150 fps | 98.9% |
| Somchem S365 | <<locked>> | 82% | 54,230 psi | 85% | 3173 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,376 psi | 87% | 3202 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,405 psi | 87% | 3186 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 57,261 psi | 90% | 3219 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 54,186 psi | 85% | 3199 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 54,085 psi | 85% | 3281 fps | 99% |
| Vihtavuori N565 | <<locked>> | 92% | 54,795 psi | 86% | 3264 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 96% | 56,449 psi | 88% | 3337 fps | 98.8% |
| Vihtavuori N570 | <<locked>> | 98% | 57,653 psi | 90% | 3402 fps | 97.5% |
| Winchester StaBALL HD | <<locked>> | 90% | 55,985 psi | 88% | 3317 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,347 psi | 87% | 3199 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% | 40,915 psi | 64% | 2907 fps | 99.4% |
| Accurate High Country | <<locked>> | 80% | 45,194 psi | 71% | 3114 fps | 97.8% |
| Accurate MAGPRO | <<locked>> | 80% | 42,656 psi | 67% | 3038 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 45,310 psi | 71% | 3061 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 80% | 40,611 psi | 64% | 2989 fps | 96.4% |
| ADI AR 2217 | <<locked>> | 86% | 37,057 psi | 58% | 2890 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 98% | 49,313 psi | 77% | 3255 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 84% | 31,444 psi | 49% | 2776 fps | 96.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,672 psi | 72% | 3061 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,214 psi | 82% | 3192 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,252 psi | 71% | 3051 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,234 psi | 65% | 2992 fps | 97.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,900 psi | 63% | 2936 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,330 psi | 54% | 2848 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,165 psi | 71% | 3114 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 46,688 psi | 73% | 3163 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 48,283 psi | 76% | 3091 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 38,319 psi | 60% | 2920 fps | 96.8% |
| Bofors RP30 | <<locked>> | 84% | 36,811 psi | 58% | 2900 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 41,234 psi | 65% | 2992 fps | 97.8% |
| Hodgdon H1000 | <<locked>> | 82% | 35,041 psi | 55% | 2838 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 80% | 43,279 psi | 68% | 2992 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,467 psi | 67% | 2976 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,921 psi | 77% | 3051 fps | 100% |
| Hodgdon Retumbo | 89.7 gr | 80% | 33,533 psi | 53% | 2877 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,094 psi | 44% | 1893 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,010 psi | 80% | 3114 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 51,271 psi | 80% | 3117 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,353 psi | 70% | 2989 fps | 97.1% |
| IMR 7828 SSC | <<locked>> | 80% | 39,276 psi | 62% | 2963 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 92% | 37,956 psi | 59% | 2949 fps | 95.9% |
| Lovex S070 | <<locked>> | 80% | 53,040 psi | 83% | 3150 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,085 psi | 55% | 2769 fps | 98.2% |
| Norma 204 | <<locked>> | 80% | 51,880 psi | 81% | 3169 fps | 99.5% |
| Norma 217 | <<locked>> | 88% | 33,025 psi | 52% | 2831 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 43,787 psi | 69% | 3071 fps | 99.3% |
| Norma URP | <<locked>> | 80% | 52,953 psi | 83% | 3169 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,146 psi | 61% | 2969 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 80% | 51,895 psi | 81% | 3169 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,157 psi | 55% | 2831 fps | 96.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,674 psi | 45% | 1932 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,417 psi | 84% | 3235 fps | 100% |
| ReloadSwiss RS 76 | 96 gr | 80% | 32,764 psi | 51% | 2844 fps | 96.7% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 40,843 psi | 64% | 3022 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 46,296 psi | 73% | 3035 fps | 98% |
| Rottweil R 905 | <<locked>> | 80% | 44,686 psi | 70% | 3038 fps | 98.6% |
| Shooters World SW4350 | <<locked>> | 80% | 53,040 psi | 83% | 3150 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,374 psi | 84% | 3097 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,353 psi | 70% | 3031 fps | 98.5% |
| Somchem S361 | <<locked>> | 80% | 47,181 psi | 74% | 3018 fps | 97.6% |
| Somchem S365 | <<locked>> | 80% | 50,459 psi | 79% | 3110 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,150 psi | 71% | 3012 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 80% | 39,305 psi | 62% | 2874 fps | 97.8% |
| Vihtavuori N550 | <<locked>> | 80% | 53,693 psi | 84% | 3163 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,309 psi | 69% | 3022 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,540 psi | 68% | 3064 fps | 96.7% |
| Vihtavuori N565 | <<locked>> | 82% | 38,421 psi | 60% | 2917 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 88% | 41,916 psi | 66% | 3041 fps | 95.1% |
| Vihtavuori N570 | 109.4 gr | 94% | 49,734 psi | 78% | 3251 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,652 psi | 59% | 2979 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,626 psi | 65% | 2933 fps | 97.9% |
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 61 powders for .30-378 Weath. Mag. loaded with the .306 | 160gr | AERO SB,- smax:17.9. Vihtavuori N570 delivers the highest muzzle velocity at 3,402 fps; across all powders the maximum-charge window runs from 2,110 fps to 3,402 fps. ADI AR 2218 gives the best case fill at 100 %, and 61 of the 61 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 160.0 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .30-378 Weath. Mag. with the .306 | 160gr | AERO SB,- smax:17.9 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.