Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | Speer Soft Point bullet and 54 powders. The key underlying parameters are shown in the table above.
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% | 55,985 psi | 88% | 3264 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 53,954 psi | 85% | 3363 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 86% | 54,969 psi | 86% | 3369 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 86% | 57,130 psi | 90% | 3363 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 55,622 psi | 87% | 3373 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 96% | 54,389 psi | 85% | 3340 fps | 99.4% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,114 psi | 86% | 3448 fps | 97.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 57,145 psi | 90% | 3425 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,159 psi | 90% | 3360 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,652 psi | 89% | 3346 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,086 psi | 88% | 3366 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 88% | 54,041 psi | 85% | 3274 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 54,433 psi | 85% | 3346 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,737 psi | 86% | 3363 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,724 psi | 89% | 3428 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,347 psi | 88% | 3323 fps | 97.4% |
| Bofors RP15 | <<locked>> | 90% | 55,448 psi | 87% | 3353 fps | 99.7% |
| Bofors RP30 | <<locked>> | 94% | 54,317 psi | 85% | 3353 fps | 99.4% |
| Bofors RP5 | <<locked>> | 88% | 56,086 psi | 88% | 3366 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 94% | 55,796 psi | 87% | 3366 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 86% | 54,752 psi | 86% | 3297 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,522 psi | 90% | 3346 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,290 psi | 90% | 3268 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 57,363 psi | 90% | 3504 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,565 psi | 59% | 2188 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,564 psi | 87% | 3274 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,260 psi | 88% | 3281 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,201 psi | 87% | 3278 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 88% | 53,896 psi | 84% | 3350 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,257 psi | 82% | 3327 fps | 99.1% |
| Lovex S071 | <<locked>> | 94% | 57,638 psi | 90% | 3291 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,985 psi | 89% | 3340 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 53,388 psi | 84% | 3360 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,173 psi | 88% | 3386 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,984 psi | 86% | 3373 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 82% | 57,000 psi | 89% | 3337 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 53,650 psi | 84% | 3291 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,551 psi | 60% | 2238 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 54,288 psi | 85% | 3415 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 53,882 psi | 84% | 3366 fps | 98.5% |
| Rottweil R 904 | <<locked>> | 86% | 57,595 psi | 90% | 3327 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 86% | 56,478 psi | 89% | 3343 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,086 psi | 88% | 3337 fps | 99.8% |
| Somchem S361 | <<locked>> | 84% | 55,535 psi | 87% | 3251 fps | 98.8% |
| Somchem S365 | <<locked>> | 82% | 55,564 psi | 87% | 3274 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,768 psi | 89% | 3304 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,811 psi | 89% | 3287 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 55,970 psi | 88% | 3307 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,593 psi | 87% | 3383 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 92% | 56,739 psi | 89% | 3376 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 94% | 54,273 psi | 85% | 3369 fps | 98.1% |
| Vihtavuori N570 | <<locked>> | 96% | 55,593 psi | 87% | 3438 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 53,853 psi | 84% | 3363 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,768 psi | 89% | 3301 fps | 99.8% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 42,511 psi | 67% | 3015 fps | 99.5% |
| Accurate High Country | <<locked>> | 80% | 46,731 psi | 73% | 3215 fps | 97.7% |
| Accurate MAGPRO | <<locked>> | 80% | 44,193 psi | 69% | 3143 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 46,499 psi | 73% | 3159 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 41,771 psi | 65% | 3084 fps | 96.3% |
| ADI AR 2217 | <<locked>> | 86% | 38,261 psi | 60% | 2986 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 98% | 51,068 psi | 80% | 3363 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 82% | 30,589 psi | 48% | 2802 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,417 psi | 84% | 3294 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,441 psi | 73% | 3153 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,511 psi | 67% | 3091 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,263 psi | 65% | 3038 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,650 psi | 56% | 2949 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,862 psi | 73% | 3219 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 48,718 psi | 76% | 3271 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 49,429 psi | 77% | 3189 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 39,566 psi | 62% | 3018 fps | 96.7% |
| Bofors RP30 | <<locked>> | 84% | 38,334 psi | 60% | 3002 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 42,511 psi | 67% | 3091 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 82% | 36,332 psi | 57% | 2936 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 80% | 44,498 psi | 70% | 3091 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,598 psi | 68% | 3071 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,227 psi | 79% | 3156 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 34,780 psi | 55% | 2979 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,123 psi | 44% | 1962 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,141 psi | 82% | 3215 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 52,721 psi | 83% | 3222 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,455 psi | 71% | 3084 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 40,480 psi | 63% | 3061 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 92% | 39,595 psi | 62% | 3051 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 36,637 psi | 57% | 2874 fps | 98.3% |
| Norma 204 | <<locked>> | 80% | 53,214 psi | 83% | 3271 fps | 99.4% |
| Norma 217 | <<locked>> | 86% | 32,300 psi | 51% | 2871 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 45,266 psi | 71% | 3176 fps | 99.3% |
| Ramshot Grand | <<locked>> | 80% | 40,596 psi | 64% | 3071 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 80% | 53,301 psi | 84% | 3274 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,564 psi | 57% | 2930 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,950 psi | 45% | 2011 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,171 psi | 54% | 2949 fps | 96.8% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 42,656 psi | 67% | 3130 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 47,340 psi | 74% | 3133 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 80% | 46,050 psi | 72% | 3140 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,701 psi | 72% | 3136 fps | 98.5% |
| Somchem S361 | <<locked>> | 80% | 48,486 psi | 76% | 3117 fps | 97.5% |
| Somchem S365 | <<locked>> | 80% | 51,924 psi | 81% | 3219 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,485 psi | 73% | 3114 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 80% | 40,567 psi | 64% | 2972 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 80% | 45,818 psi | 72% | 3127 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,962 psi | 70% | 3163 fps | 96.7% |
| Vihtavuori N565 | <<locked>> | 82% | 40,089 psi | 63% | 3025 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 88% | 43,642 psi | 68% | 3150 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 94% | 51,547 psi | 81% | 3356 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,407 psi | 62% | 3091 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,931 psi | 67% | 3031 fps | 97.8% |
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 .308 | 150gr | Speer Soft Point. Hodgdon Retumbo delivers the highest muzzle velocity at 3,504 fps; across all powders the maximum-charge window runs from 2,188 fps to 3,504 fps. Accurate 8700 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 150.0 gr projectile in 0.308" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, ADI AR 2225 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. As outliers, Accurate 8700, IMR 7977 Enduron, Lovex D100 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.