Load Specifications
Load data in caliber .30-378 Weath. Mag. with .307 | 165gr | Rhino Penetrator 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% | 56,884 psi | 89% | 3156 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 55,854 psi | 88% | 3268 fps | 99% |
| ADI AR 2209 | <<locked>> | 84% | 54,230 psi | 85% | 3189 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 56,449 psi | 88% | 3264 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 96% | 55,230 psi | 87% | 3238 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,883 psi | 88% | 3356 fps | 98% |
| ADI AR 2225 | <<locked>> | 98% | 54,172 psi | 85% | 3261 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,493 psi | 90% | 3238 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,898 psi | 89% | 3261 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 54,969 psi | 86% | 3163 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,376 psi | 87% | 3241 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,593 psi | 87% | 3251 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,537 psi | 90% | 3333 fps | 98.1% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 53,127 psi | 83% | 3245 fps | 96.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,000 psi | 89% | 3219 fps | 98.1% |
| Bofors RP15 | <<locked>> | 90% | 56,260 psi | 88% | 3248 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 55,129 psi | 86% | 3248 fps | 99.8% |
| Bofors RP5 | <<locked>> | 88% | 56,898 psi | 89% | 3261 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 56,855 psi | 89% | 3264 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 55,550 psi | 87% | 3196 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 86% | 54,520 psi | 85% | 3176 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 54,549 psi | 85% | 3097 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 54,418 psi | 85% | 3330 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,652 psi | 59% | 2080 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,449 psi | 88% | 3166 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,217 psi | 90% | 3169 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,898 psi | 88% | 3169 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 88% | 54,868 psi | 86% | 3245 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,229 psi | 83% | 3232 fps | 99.6% |
| Lovex S071 | <<locked>> | 92% | 54,853 psi | 86% | 3127 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,259 psi | 85% | 3258 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,101 psi | 89% | 3278 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,144 psi | 88% | 3271 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 90% | 54,563 psi | 86% | 3189 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,580 psi | 60% | 2129 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,259 psi | 87% | 3314 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,665 psi | 86% | 3271 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 84% | 54,824 psi | 86% | 3156 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 86% | 57,290 psi | 90% | 3232 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,884 psi | 89% | 3225 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,246 psi | 88% | 3146 fps | 99.3% |
| Somchem S365 | <<locked>> | 82% | 56,623 psi | 89% | 3159 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,696 psi | 90% | 3196 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,682 psi | 90% | 3179 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,956 psi | 89% | 3199 fps | 96.4% |
| Vihtavuori N555 | <<locked>> | 86% | 56,942 psi | 89% | 3196 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,492 psi | 89% | 3278 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 92% | 57,537 psi | 90% | 3268 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 94% | 55,274 psi | 87% | 3278 fps | 98.8% |
| Vihtavuori N570 | <<locked>> | 96% | 56,449 psi | 88% | 3340 fps | 97.5% |
| Winchester StaBALL HD | <<locked>> | 88% | 55,085 psi | 86% | 3258 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,624 psi | 90% | 3192 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% | 43,410 psi | 68% | 2920 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 80% | 45,063 psi | 71% | 3054 fps | 96.9% |
| ADI AR 2209 | <<locked>> | 80% | 47,384 psi | 74% | 3061 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 80% | 42,569 psi | 67% | 2992 fps | 97.3% |
| ADI AR 2217 | <<locked>> | 84% | 36,419 psi | 57% | 2835 fps | 95.6% |
| ADI AR 2218 | <<locked>> | 96% | 48,051 psi | 75% | 3192 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 29,095 psi | 46% | 2661 fps | 95.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,311 psi | 74% | 3054 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,323 psi | 68% | 2999 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,076 psi | 66% | 2936 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,448 psi | 57% | 2867 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,805 psi | 75% | 3117 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 45,847 psi | 72% | 3107 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 98% | 49,269 psi | 77% | 3166 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 46,963 psi | 74% | 3025 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 40,350 psi | 63% | 2930 fps | 97.7% |
| Bofors RP30 | <<locked>> | 82% | 36,463 psi | 57% | 2854 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 43,323 psi | 68% | 2999 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 80% | 34,490 psi | 54% | 2785 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 80% | 45,179 psi | 71% | 2995 fps | 97.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,382 psi | 70% | 2979 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,995 psi | 80% | 3041 fps | 100% |
| Hodgdon Retumbo | 89.5 gr | 80% | 35,520 psi | 56% | 2904 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,253 psi | 44% | 1864 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,011 psi | 83% | 3107 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,650 psi | 84% | 3114 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,209 psi | 72% | 2986 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 80% | 41,278 psi | 65% | 2972 fps | 97% |
| IMR 8133 Enduron | <<locked>> | 88% | 35,099 psi | 55% | 2835 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 37,318 psi | 58% | 2785 fps | 99% |
| Norma 217 | <<locked>> | 84% | 30,806 psi | 48% | 2730 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 46,079 psi | 72% | 3077 fps | 99.7% |
| Ramshot Grand | <<locked>> | 80% | 41,379 psi | 65% | 2986 fps | 97.4% |
| Ramshot Magnum | <<locked>> | 80% | 37,376 psi | 59% | 2851 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,022 psi | 45% | 1909 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,882 psi | 55% | 2874 fps | 98.1% |
| ReloadSwiss RS 80 | 103.8 gr | 86% | 40,176 psi | 63% | 2969 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 48,124 psi | 75% | 3031 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 80% | 46,920 psi | 74% | 3045 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,572 psi | 73% | 3038 fps | 99.1% |
| Somchem S361 | <<locked>> | 80% | 49,240 psi | 77% | 3018 fps | 98.3% |
| Somchem S365 | <<locked>> | 80% | 52,968 psi | 83% | 3107 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,268 psi | 74% | 3015 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 80% | 41,394 psi | 65% | 2881 fps | 98.6% |
| Vihtavuori N170 | <<locked>> | 92% | 53,243 psi | 83% | 3133 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 46,673 psi | 73% | 3022 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,716 psi | 72% | 3071 fps | 97.6% |
| Vihtavuori N565 | <<locked>> | 80% | 38,087 psi | 60% | 2871 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 86% | 41,307 psi | 65% | 2989 fps | 95.3% |
| Vihtavuori N570 | 106.9 gr | 92% | 48,849 psi | 77% | 3192 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,408 psi | 63% | 2999 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,656 psi | 68% | 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 .307 | 165gr | Rhino Penetrator. ADI AR 2218 delivers the highest muzzle velocity at 3,356 fps; across all powders the maximum-charge window runs from 2,080 fps to 3,356 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 0.307" 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 .307 | 165gr | Rhino Penetrator 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.