Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 152gr | Remington SP Extended-Range 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% | 56,739 psi | 89% | 3261 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 54,708 psi | 86% | 3363 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 86% | 55,724 psi | 87% | 3366 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 84% | 54,099 psi | 85% | 3294 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 88% | 56,347 psi | 88% | 3366 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 96% | 55,288 psi | 87% | 3340 fps | 99.6% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 56,014 psi | 88% | 3451 fps | 97.5% |
| ADI AR 2225 | <<locked>> | 98% | 54,288 psi | 85% | 3363 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,479 psi | 90% | 3346 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,797 psi | 89% | 3363 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 54,969 psi | 86% | 3268 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,259 psi | 87% | 3340 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,564 psi | 87% | 3356 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 53,534 psi | 84% | 3353 fps | 96.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 53,330 psi | 84% | 3333 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,101 psi | 89% | 3320 fps | 97.7% |
| Bofors RP15 | <<locked>> | 90% | 56,144 psi | 88% | 3350 fps | 99.8% |
| Bofors RP30 | <<locked>> | 94% | 55,259 psi | 87% | 3353 fps | 99.6% |
| Bofors RP5 | <<locked>> | 88% | 56,797 psi | 89% | 3363 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 94% | 56,753 psi | 89% | 3366 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 55,405 psi | 87% | 3294 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 86% | 54,447 psi | 85% | 3274 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 54,433 psi | 85% | 3205 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 54,317 psi | 85% | 3428 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,637 psi | 59% | 2178 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,347 psi | 88% | 3271 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,116 psi | 90% | 3278 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,811 psi | 87% | 3274 fps | 99% |
| IMR 7828 SSC | <<locked>> | 88% | 54,795 psi | 86% | 3346 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,200 psi | 83% | 3330 fps | 99.3% |
| Lovex S071 | <<locked>> | 92% | 54,940 psi | 86% | 3232 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,682 psi | 90% | 3333 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 54,404 psi | 85% | 3360 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,087 psi | 89% | 3383 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 55,999 psi | 88% | 3373 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 82% | 57,682 psi | 90% | 3330 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 54,607 psi | 86% | 3291 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,624 psi | 61% | 2228 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,332 psi | 87% | 3415 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,868 psi | 86% | 3369 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 84% | 54,607 psi | 86% | 3258 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 86% | 57,188 psi | 90% | 3337 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,797 psi | 89% | 3333 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 56,260 psi | 88% | 3248 fps | 99% |
| Somchem S365 | <<locked>> | 82% | 56,478 psi | 89% | 3271 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,638 psi | 90% | 3304 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,653 psi | 90% | 3284 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 56,753 psi | 89% | 3301 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,507 psi | 89% | 3383 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 92% | 57,493 psi | 90% | 3369 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 94% | 55,230 psi | 87% | 3373 fps | 98.4% |
| Vihtavuori N570 | <<locked>> | 96% | 56,579 psi | 89% | 3438 fps | 97% |
| Winchester StaBALL HD | <<locked>> | 88% | 54,940 psi | 86% | 3360 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,638 psi | 90% | 3297 fps | 99.9% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 43,163 psi | 68% | 3012 fps | 99.6% |
| Accurate High Country | <<locked>> | 80% | 47,427 psi | 74% | 3215 fps | 98% |
| Accurate MAGPRO | <<locked>> | 80% | 44,976 psi | 70% | 3146 fps | 96.2% |
| ADI AR 2209 | <<locked>> | 80% | 47,152 psi | 74% | 3159 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 42,496 psi | 67% | 3087 fps | 96.7% |
| ADI AR 2217 | <<locked>> | 86% | 38,957 psi | 61% | 2992 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 96% | 48,153 psi | 75% | 3278 fps | 95% |
| ADI AR 2225 | <<locked>> | 82% | 31,082 psi | 49% | 2805 fps | 95.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,050 psi | 74% | 3146 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,250 psi | 68% | 3094 fps | 98.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,916 psi | 66% | 3031 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,230 psi | 57% | 2949 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,805 psi | 75% | 3219 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 49,603 psi | 78% | 3274 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 98% | 49,429 psi | 77% | 3255 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 46,920 psi | 74% | 3120 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 40,161 psi | 63% | 3018 fps | 97.1% |
| Bofors RP30 | <<locked>> | 84% | 38,943 psi | 61% | 3005 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 43,250 psi | 68% | 3094 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 82% | 36,898 psi | 58% | 2940 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 80% | 45,107 psi | 71% | 3091 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,324 psi | 69% | 3071 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,908 psi | 80% | 3150 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 35,462 psi | 56% | 2986 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,239 psi | 44% | 1955 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,750 psi | 83% | 3212 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 53,388 psi | 84% | 3215 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,992 psi | 72% | 3081 fps | 97.2% |
| IMR 7828 SSC | <<locked>> | 80% | 41,249 psi | 65% | 3064 fps | 96.3% |
| IMR 8133 Enduron | <<locked>> | 90% | 37,652 psi | 59% | 2986 fps | 95.3% |
| Lovex S071 | <<locked>> | 80% | 37,217 psi | 58% | 2874 fps | 98.5% |
| Norma 204 | <<locked>> | 80% | 53,867 psi | 84% | 3268 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 32,924 psi | 52% | 2871 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 45,977 psi | 72% | 3173 fps | 99.5% |
| Ramshot Grand | <<locked>> | 80% | 41,292 psi | 65% | 3074 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 80% | 53,969 psi | 85% | 3268 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,188 psi | 58% | 2933 fps | 97.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,950 psi | 45% | 1998 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 34,867 psi | 55% | 2953 fps | 97.3% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 43,511 psi | 68% | 3133 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 47,950 psi | 75% | 3133 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 80% | 46,673 psi | 73% | 3140 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,340 psi | 73% | 3133 fps | 98.7% |
| Somchem S361 | <<locked>> | 80% | 49,168 psi | 77% | 3117 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 52,663 psi | 83% | 3209 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,224 psi | 74% | 3114 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 80% | 41,147 psi | 64% | 2969 fps | 98.1% |
| Vihtavuori N555 | <<locked>> | 80% | 46,499 psi | 73% | 3123 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,600 psi | 71% | 3163 fps | 97% |
| Vihtavuori N565 | <<locked>> | 82% | 40,698 psi | 64% | 3022 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 88% | 44,483 psi | 70% | 3153 fps | 95.7% |
| Vihtavuori N570 | <<locked>> | 94% | 52,489 psi | 82% | 3360 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,190 psi | 63% | 3087 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,540 psi | 68% | 3031 fps | 98.1% |
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 | 152gr | Remington SP Extended-Range. ADI AR 2218 delivers the highest muzzle velocity at 3,451 fps; across all powders the maximum-charge window runs from 2,178 fps to 3,451 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 152.0 gr projectile in 0.308" calls for a 1:17.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, Alliant Reloder-50 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.