Load Specifications
Load data in caliber .30-378 Weath. Mag. with .307 | 150gr | Rhino Penetrator bullet and 62 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 ReloadSwiss RS 80.
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% | 54,230 psi | 85% | 3238 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 55,956 psi | 88% | 3402 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 88% | 57,188 psi | 90% | 3412 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 86% | 55,448 psi | 87% | 3333 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 88% | 53,824 psi | 84% | 3340 fps | 98.9% |
| ADI AR 2217 | <<locked>> | 98% | 56,347 psi | 88% | 3373 fps | 99.6% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 53,069 psi | 83% | 3406 fps | 96.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,984 psi | 86% | 3396 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 55,811 psi | 87% | 3333 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,579 psi | 87% | 3333 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,230 psi | 87% | 3323 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 88% | 54,317 psi | 85% | 3337 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 90% | 56,057 psi | 88% | 3307 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,275 psi | 88% | 3383 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,840 psi | 89% | 3399 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 54,578 psi | 86% | 3392 fps | 96.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 54,897 psi | 86% | 3294 fps | 97% |
| Bofors RP15 | <<locked>> | 92% | 57,479 psi | 90% | 3392 fps | 99.8% |
| Bofors RP30 | <<locked>> | 96% | 56,086 psi | 88% | 3386 fps | 99.5% |
| Bofors RP5 | <<locked>> | 88% | 54,317 psi | 85% | 3337 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 94% | 53,983 psi | 85% | 3337 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 88% | 57,014 psi | 89% | 3340 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,854 psi | 88% | 3317 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,825 psi | 87% | 3245 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,274 psi | 87% | 3471 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,492 psi | 59% | 2178 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 54,302 psi | 85% | 3255 fps | 99.9% |
| IMR 4831 | <<locked>> | 82% | 54,853 psi | 86% | 3261 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,377 psi | 90% | 3317 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 90% | 56,086 psi | 88% | 3389 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,299 psi | 79% | 3291 fps | 98.7% |
| Lovex S070 | <<locked>> | 82% | 56,463 psi | 88% | 3287 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,043 psi | 88% | 3268 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,550 psi | 87% | 3314 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 51,285 psi | 80% | 3323 fps | 99.9% |
| Norma MRP | <<locked>> | 86% | 54,346 psi | 85% | 3356 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,391 psi | 88% | 3307 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 57,348 psi | 90% | 3415 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 82% | 55,535 psi | 87% | 3314 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 55,927 psi | 88% | 3333 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,479 psi | 60% | 2228 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,261 psi | 90% | 3383 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 56,347 psi | 88% | 3455 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,825 psi | 87% | 3409 fps | 98.7% |
| Rottweil R 904 | <<locked>> | 86% | 56,217 psi | 88% | 3301 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 86% | 54,795 psi | 86% | 3310 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 82% | 56,463 psi | 88% | 3287 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,014 psi | 89% | 3238 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 54,404 psi | 85% | 3307 fps | 99.6% |
| Somchem S361 | <<locked>> | 84% | 54,070 psi | 85% | 3222 fps | 98.5% |
| Somchem S365 | <<locked>> | 82% | 54,012 psi | 85% | 3255 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,259 psi | 87% | 3281 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 90% | 55,172 psi | 86% | 3261 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 82% | 57,363 psi | 90% | 3301 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 54,360 psi | 85% | 3284 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 53,867 psi | 84% | 3353 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 92% | 54,766 psi | 86% | 3340 fps | 98.9% |
| Vihtavuori N568 | <<locked>> | 96% | 56,333 psi | 88% | 3412 fps | 98.4% |
| Vihtavuori N570 | <<locked>> | 98% | 57,566 psi | 90% | 3478 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,638 psi | 90% | 3238 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 55,927 psi | 88% | 3402 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,129 psi | 86% | 3274 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% | 41,350 psi | 65% | 2989 fps | 99.2% |
| Accurate High Country | <<locked>> | 80% | 45,237 psi | 71% | 3186 fps | 97.3% |
| Accurate MAGPRO | <<locked>> | 80% | 42,786 psi | 67% | 3114 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 45,310 psi | 71% | 3136 fps | 98.2% |
| ADI AR 2213 | <<locked>> | 80% | 40,553 psi | 64% | 3054 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 88% | 39,827 psi | 62% | 3028 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 98% | 49,255 psi | 77% | 3320 fps | 95% |
| ADI AR 2225 | <<locked>> | 84% | 31,647 psi | 50% | 2838 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,716 psi | 72% | 3133 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,011 psi | 82% | 3271 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,295 psi | 71% | 3127 fps | 98.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,220 psi | 65% | 3064 fps | 97.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,016 psi | 63% | 3015 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,563 psi | 54% | 2923 fps | 98.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,237 psi | 71% | 3192 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 50,459 psi | 79% | 3310 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 48,240 psi | 76% | 3159 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 38,421 psi | 60% | 2989 fps | 96.2% |
| Bofors RP30 | <<locked>> | 86% | 39,697 psi | 62% | 3041 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 41,220 psi | 65% | 3064 fps | 97.3% |
| Hodgdon H1000 | <<locked>> | 84% | 37,782 psi | 59% | 2979 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 80% | 43,178 psi | 68% | 3061 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,395 psi | 66% | 3045 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,907 psi | 77% | 3133 fps | 100% |
| Hodgdon Retumbo | 93.7 gr | 82% | 36,114 psi | 57% | 3022 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,050 psi | 44% | 1952 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,024 psi | 80% | 3192 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 51,430 psi | 81% | 3202 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,440 psi | 70% | 3061 fps | 96.5% |
| IMR 7828 SSC | <<locked>> | 80% | 39,233 psi | 61% | 3028 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 92% | 38,043 psi | 60% | 3015 fps | 95.2% |
| Lovex S070 | <<locked>> | 80% | 53,084 psi | 83% | 3232 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,476 psi | 56% | 2848 fps | 97.9% |
| Norma 204 | <<locked>> | 80% | 51,764 psi | 81% | 3245 fps | 99.2% |
| Norma 217 | <<locked>> | 88% | 33,301 psi | 52% | 2904 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 43,772 psi | 69% | 3146 fps | 99% |
| Norma URP | <<locked>> | 80% | 52,852 psi | 83% | 3248 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,189 psi | 61% | 3038 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 51,808 psi | 81% | 3248 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,288 psi | 55% | 2900 fps | 96.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,761 psi | 45% | 1998 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,287 psi | 84% | 3317 fps | 100% |
| ReloadSwiss RS 76 | 97.9 gr | 80% | 33,054 psi | 52% | 2913 fps | 96.1% |
| ReloadSwiss RS 80 | 111 gr | 90% | 44,251 psi | 69% | 3173 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 46,253 psi | 72% | 3110 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 80% | 44,817 psi | 70% | 3114 fps | 98.2% |
| Shooters World SW4350 | <<locked>> | 80% | 53,084 psi | 83% | 3232 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,534 psi | 84% | 3176 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,469 psi | 70% | 3110 fps | 98.2% |
| Somchem S361 | <<locked>> | 80% | 47,282 psi | 74% | 3091 fps | 97.1% |
| Somchem S365 | <<locked>> | 80% | 50,502 psi | 79% | 3196 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,223 psi | 71% | 3091 fps | 98.9% |
| Vihtavuori N165 | <<locked>> | 80% | 39,508 psi | 62% | 2946 fps | 97.4% |
| Vihtavuori N550 | <<locked>> | 80% | 53,577 psi | 84% | 3241 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,512 psi | 70% | 3100 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,526 psi | 68% | 3133 fps | 96.1% |
| Vihtavuori N565 | <<locked>> | 84% | 41,553 psi | 65% | 3061 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 90% | 45,194 psi | 71% | 3186 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 96% | 53,417 psi | 84% | 3399 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,824 psi | 84% | 3179 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,666 psi | 59% | 3058 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,640 psi | 65% | 3005 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 62 powders for .30-378 Weath. Mag. loaded with the .307 | 150gr | Rhino Penetrator. Vihtavuori N570 delivers the highest muzzle velocity at 3,478 fps; across all powders the maximum-charge window runs from 2,178 fps to 3,478 fps. ADI AR 2218 gives the best case fill at 100 %, and 62 of the 62 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 150.0 gr projectile in 0.307" calls for a 1:13.0 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, ReloadSwiss RS 80 rank at the top here: for .30-378 Weath. Mag. with the .307 | 150gr | 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.