Load Specifications
Load data in caliber .30-378 Weath. Mag. with .307 | 165gr | Rhino Solid Shank bullet and 49 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>> | 86% | 55,114 psi | 86% | 3130 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 54,085 psi | 85% | 3235 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 84% | 56,144 psi | 88% | 3225 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 54,737 psi | 86% | 3235 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 96% | 57,667 psi | 90% | 3274 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 54,317 psi | 85% | 3327 fps | 97.9% |
| ADI AR 2225 | <<locked>> | 98% | 56,971 psi | 89% | 3301 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,724 psi | 87% | 3209 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,317 psi | 87% | 3232 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,130 psi | 90% | 3192 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 53,998 psi | 85% | 3212 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 53,983 psi | 85% | 3222 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,188 psi | 88% | 3307 fps | 98% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,072 psi | 88% | 3291 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,274 psi | 87% | 3189 fps | 98% |
| Bofors RP15 | <<locked>> | 88% | 54,694 psi | 86% | 3222 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 57,580 psi | 90% | 3287 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 55,317 psi | 87% | 3232 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 55,259 psi | 87% | 3235 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 57,624 psi | 90% | 3228 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,449 psi | 88% | 3209 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,318 psi | 88% | 3127 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,058 psi | 89% | 3366 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,753 psi | 59% | 2093 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,711 psi | 90% | 3202 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 88% | 57,145 psi | 90% | 3284 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,912 psi | 88% | 3278 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 57,072 psi | 89% | 3159 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,174 psi | 90% | 3301 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,361 psi | 87% | 3248 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,433 psi | 85% | 3241 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 90% | 57,174 psi | 90% | 3232 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,812 psi | 61% | 2146 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 53,838 psi | 84% | 3281 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,493 psi | 90% | 3314 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 84% | 56,652 psi | 89% | 3192 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 84% | 55,564 psi | 87% | 3202 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,187 psi | 86% | 3199 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,375 psi | 85% | 3117 fps | 99.2% |
| Somchem S385 | <<locked>> | 84% | 55,956 psi | 88% | 3169 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,883 psi | 88% | 3153 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 55,230 psi | 87% | 3169 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 84% | 55,245 psi | 87% | 3169 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,766 psi | 86% | 3248 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 90% | 56,072 psi | 88% | 3245 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 92% | 53,795 psi | 84% | 3248 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 94% | 55,216 psi | 87% | 3314 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 86% | 53,751 psi | 84% | 3228 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,738 psi | 87% | 3163 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% | 44,991 psi | 71% | 2953 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 46,876 psi | 73% | 3091 fps | 97.5% |
| ADI AR 2209 | <<locked>> | 80% | 49,008 psi | 77% | 3094 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 44,266 psi | 69% | 3028 fps | 97.9% |
| ADI AR 2217 | <<locked>> | 82% | 35,404 psi | 55% | 2808 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 94% | 46,804 psi | 73% | 3166 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 30,371 psi | 48% | 2703 fps | 96.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,892 psi | 77% | 3084 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,063 psi | 71% | 3038 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,787 psi | 69% | 2969 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,014 psi | 60% | 2900 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,024 psi | 78% | 3156 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 48,298 psi | 76% | 3153 fps | 96.1% |
| Alliant Reloder-50 | <<locked>> | 96% | 48,298 psi | 76% | 3140 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 45,484 psi | 71% | 2999 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 41,916 psi | 66% | 2963 fps | 98.2% |
| Bofors RP30 | <<locked>> | 80% | 35,520 psi | 56% | 2825 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 45,063 psi | 71% | 3038 fps | 99% |
| Hodgdon H1000 | <<locked>> | 80% | 35,897 psi | 56% | 2825 fps | 96.3% |
| Hodgdon H4831 | <<locked>> | 80% | 46,804 psi | 73% | 3031 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,992 psi | 72% | 3012 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,808 psi | 83% | 3071 fps | 100% |
| Hodgdon Retumbo | 92.6 gr | 80% | 37,130 psi | 58% | 2946 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,297 psi | 44% | 1877 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,616 psi | 75% | 3018 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 80% | 43,033 psi | 67% | 3012 fps | 97.6% |
| IMR 8133 Enduron | <<locked>> | 88% | 36,883 psi | 58% | 2874 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 38,754 psi | 61% | 2818 fps | 99.3% |
| Norma 217 | <<locked>> | 82% | 30,182 psi | 47% | 2703 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 48,037 psi | 75% | 3117 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 43,323 psi | 68% | 3025 fps | 98.1% |
| Ramshot Magnum | <<locked>> | 80% | 39,088 psi | 61% | 2887 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,051 psi | 46% | 1923 fps | 100% |
| ReloadSwiss RS 76 | 99.1 gr | 80% | 36,564 psi | 57% | 2917 fps | 98.7% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 39,189 psi | 61% | 2940 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 49,661 psi | 78% | 3064 fps | 99% |
| Rottweil R 905 | <<locked>> | 80% | 48,573 psi | 76% | 3077 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,225 psi | 76% | 3071 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 50,778 psi | 80% | 3051 fps | 98.7% |
| Somchem S385 | <<locked>> | 80% | 48,979 psi | 77% | 3048 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 42,844 psi | 67% | 2910 fps | 99% |
| Vihtavuori N170 | <<locked>> | 90% | 51,605 psi | 81% | 3104 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 48,457 psi | 76% | 3054 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,558 psi | 75% | 3110 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 80% | 39,653 psi | 62% | 2907 fps | 96.3% |
| Vihtavuori N568 | <<locked>> | 84% | 40,335 psi | 63% | 2963 fps | 95.1% |
| Vihtavuori N570 | 108.1 gr | 90% | 47,601 psi | 75% | 3163 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,569 psi | 67% | 3031 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,223 psi | 71% | 2972 fps | 99% |
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 49 powders for .30-378 Weath. Mag. loaded with the .307 | 165gr | Rhino Solid Shank. Hodgdon Retumbo delivers the highest muzzle velocity at 3,366 fps; across all powders the maximum-charge window runs from 2,093 fps to 3,366 fps. Alliant Reloder-50 gives the best case fill at 100 %, and 49 of the 49 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 0.307" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-50, Hodgdon TrailBoss, IMR 8133 Enduron 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 .307 | 165gr | Rhino Solid Shank 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.