Load Specifications
Load data in caliber .30-378 Weath. Mag. with .307 | 150gr | Rhino Solid Shank bullet and 54 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% | 56,246 psi | 88% | 3271 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 55,216 psi | 87% | 3373 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 86% | 57,348 psi | 90% | 3366 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 55,825 psi | 87% | 3376 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 96% | 54,607 psi | 86% | 3343 fps | 99.5% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,405 psi | 87% | 3451 fps | 97.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 57,537 psi | 90% | 3432 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 57,638 psi | 90% | 3363 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,435 psi | 90% | 3363 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,000 psi | 89% | 3353 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,289 psi | 88% | 3373 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 88% | 54,476 psi | 85% | 3281 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 54,694 psi | 86% | 3350 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,998 psi | 86% | 3366 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,058 psi | 89% | 3435 fps | 97.4% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,637 psi | 89% | 3327 fps | 97.5% |
| Bofors RP15 | <<locked>> | 90% | 55,666 psi | 87% | 3360 fps | 99.7% |
| Bofors RP30 | <<locked>> | 94% | 54,520 psi | 85% | 3356 fps | 99.4% |
| Bofors RP5 | <<locked>> | 88% | 56,289 psi | 88% | 3373 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 94% | 56,144 psi | 88% | 3369 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 86% | 54,955 psi | 86% | 3304 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,711 psi | 90% | 3350 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,537 psi | 90% | 3271 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 57,609 psi | 90% | 3507 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,623 psi | 59% | 2188 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,782 psi | 87% | 3281 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,507 psi | 89% | 3284 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,390 psi | 87% | 3284 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 88% | 54,143 psi | 85% | 3353 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,634 psi | 82% | 3333 fps | 99.2% |
| Lovex S071 | <<locked>> | 92% | 54,317 psi | 85% | 3238 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,203 psi | 90% | 3343 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 53,766 psi | 84% | 3363 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,405 psi | 88% | 3389 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 55,405 psi | 87% | 3379 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 82% | 57,217 psi | 90% | 3340 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 54,056 psi | 85% | 3301 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,479 psi | 60% | 2238 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 54,665 psi | 86% | 3422 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,244 psi | 85% | 3369 fps | 98.5% |
| Rottweil R 904 | <<locked>> | 84% | 54,201 psi | 85% | 3268 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 86% | 56,695 psi | 89% | 3346 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,304 psi | 88% | 3340 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 55,724 psi | 87% | 3255 fps | 98.9% |
| Somchem S365 | <<locked>> | 82% | 55,840 psi | 88% | 3281 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,014 psi | 89% | 3310 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,043 psi | 89% | 3291 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 56,217 psi | 88% | 3310 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,840 psi | 88% | 3389 fps | 99% |
| Vihtavuori N565 | <<locked>> | 92% | 56,927 psi | 89% | 3376 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 94% | 54,650 psi | 86% | 3376 fps | 98.2% |
| Vihtavuori N570 | <<locked>> | 96% | 55,985 psi | 88% | 3445 fps | 96.7% |
| Winchester StaBALL HD | <<locked>> | 88% | 54,317 psi | 85% | 3369 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,956 psi | 89% | 3304 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% | 42,743 psi | 67% | 3018 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 80% | 44,396 psi | 70% | 3150 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 46,746 psi | 73% | 3166 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 80% | 41,989 psi | 66% | 3091 fps | 96.4% |
| ADI AR 2217 | <<locked>> | 86% | 38,551 psi | 60% | 2992 fps | 95.6% |
| ADI AR 2218 | <<locked>> | 98% | 51,401 psi | 81% | 3369 fps | 96% |
| ADI AR 2225 | <<locked>> | 82% | 30,748 psi | 48% | 2808 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 47,108 psi | 74% | 3166 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,708 psi | 84% | 3301 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,673 psi | 73% | 3156 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,728 psi | 67% | 3097 fps | 97.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,510 psi | 65% | 3041 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,853 psi | 56% | 2956 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,253 psi | 74% | 3225 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 49,052 psi | 77% | 3278 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 49,603 psi | 78% | 3192 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 39,784 psi | 62% | 3022 fps | 96.8% |
| Bofors RP30 | <<locked>> | 84% | 38,537 psi | 60% | 3009 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 42,728 psi | 67% | 3097 fps | 97.8% |
| Hodgdon H1000 | <<locked>> | 82% | 36,550 psi | 57% | 2943 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 80% | 44,701 psi | 70% | 3094 fps | 96.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,801 psi | 69% | 3074 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,502 psi | 79% | 3159 fps | 100% |
| Hodgdon Retumbo | 94.2 gr | 80% | 34,983 psi | 55% | 2986 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,210 psi | 44% | 1965 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,373 psi | 82% | 3219 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 52,924 psi | 83% | 3225 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,658 psi | 72% | 3091 fps | 97% |
| IMR 7828 SSC | <<locked>> | 80% | 40,698 psi | 64% | 3064 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 92% | 39,798 psi | 62% | 3054 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 36,738 psi | 58% | 2877 fps | 98.3% |
| Norma 204 | <<locked>> | 80% | 53,432 psi | 84% | 3274 fps | 99.5% |
| Norma 217 | <<locked>> | 86% | 32,489 psi | 51% | 2874 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 45,498 psi | 71% | 3179 fps | 99.3% |
| Ramshot Grand | <<locked>> | 80% | 40,828 psi | 64% | 3077 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 80% | 53,519 psi | 84% | 3278 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,782 psi | 58% | 2936 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,921 psi | 45% | 2011 fps | 100% |
| ReloadSwiss RS 76 | 100.9 gr | 80% | 34,461 psi | 54% | 2956 fps | 97% |
| ReloadSwiss RS 80 | 111.8 gr | 88% | 42,873 psi | 67% | 3133 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 47,572 psi | 75% | 3140 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 80% | 46,238 psi | 72% | 3143 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,905 psi | 72% | 3140 fps | 98.6% |
| Somchem S361 | <<locked>> | 80% | 48,660 psi | 76% | 3120 fps | 97.6% |
| Somchem S365 | <<locked>> | 80% | 52,199 psi | 82% | 3222 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,702 psi | 73% | 3120 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 80% | 40,770 psi | 64% | 2976 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 46,064 psi | 72% | 3130 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,179 psi | 71% | 3173 fps | 96.8% |
| Vihtavuori N565 | <<locked>> | 82% | 40,277 psi | 63% | 3028 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 88% | 43,830 psi | 69% | 3150 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 94% | 51,895 psi | 81% | 3363 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,668 psi | 62% | 3094 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,134 psi | 68% | 3038 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 54 powders for .30-378 Weath. Mag. loaded with the .307 | 150gr | Rhino Solid Shank. Hodgdon Retumbo delivers the highest muzzle velocity at 3,507 fps; across all powders the maximum-charge window runs from 2,188 fps to 3,507 fps. ADI AR 2218 gives the best case fill at 100 %, and 54 of the 54 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 1:16.5 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, ReloadSwiss RS 80 rank at the top here: for .30-378 Weath. Mag. with the .307 | 150gr | 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.