Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | Speer TBBC bullet and 57 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% | 55,303 psi | 87% | 3255 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 57,087 psi | 89% | 3422 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 86% | 54,128 psi | 85% | 3353 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 86% | 56,550 psi | 89% | 3356 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 54,882 psi | 86% | 3360 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 98% | 57,551 psi | 90% | 3396 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,273 psi | 85% | 3428 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,318 psi | 88% | 3415 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,463 psi | 88% | 3346 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,086 psi | 88% | 3340 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,361 psi | 87% | 3356 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,000 psi | 89% | 3320 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 57,392 psi | 90% | 3396 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 53,940 psi | 85% | 3350 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 55,767 psi | 87% | 3412 fps | 97.1% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,825 psi | 87% | 3310 fps | 97.2% |
| Bofors RP15 | <<locked>> | 90% | 54,752 psi | 86% | 3343 fps | 99.7% |
| Bofors RP30 | <<locked>> | 96% | 57,276 psi | 90% | 3406 fps | 99.7% |
| Bofors RP5 | <<locked>> | 88% | 55,361 psi | 87% | 3356 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 94% | 55,100 psi | 86% | 3356 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 86% | 54,070 psi | 85% | 3284 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,840 psi | 89% | 3333 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,637 psi | 89% | 3258 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,405 psi | 88% | 3488 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,536 psi | 59% | 2185 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,172 psi | 86% | 3268 fps | 99.9% |
| IMR 4831 | <<locked>> | 82% | 55,796 psi | 87% | 3274 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 54,694 psi | 86% | 3271 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 90% | 57,188 psi | 90% | 3409 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,445 psi | 81% | 3314 fps | 99% |
| Lovex S070 | <<locked>> | 82% | 57,232 psi | 90% | 3301 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,956 psi | 89% | 3281 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,449 psi | 88% | 3330 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 52,504 psi | 82% | 3346 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,419 psi | 87% | 3376 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,203 psi | 90% | 3320 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,201 psi | 85% | 3356 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 82% | 56,449 psi | 88% | 3327 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,116 psi | 90% | 3350 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,522 psi | 60% | 2234 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 53,403 psi | 84% | 3402 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 57,159 psi | 90% | 3428 fps | 99% |
| Rottweil R 904 | <<locked>> | 86% | 57,072 psi | 89% | 3317 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 86% | 55,724 psi | 87% | 3330 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 82% | 57,232 psi | 90% | 3301 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,317 psi | 87% | 3323 fps | 99.7% |
| Somchem S361 | <<locked>> | 84% | 54,940 psi | 86% | 3238 fps | 98.7% |
| Somchem S365 | <<locked>> | 82% | 55,056 psi | 86% | 3268 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,246 psi | 88% | 3294 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,144 psi | 88% | 3278 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 86% | 55,172 psi | 86% | 3297 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 54,868 psi | 86% | 3373 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 92% | 55,898 psi | 88% | 3360 fps | 99.1% |
| Vihtavuori N568 | <<locked>> | 96% | 57,624 psi | 90% | 3435 fps | 98.6% |
| Vihtavuori N570 | <<locked>> | 96% | 54,766 psi | 86% | 3422 fps | 96.4% |
| Winchester StaBALL HD | <<locked>> | 90% | 57,232 psi | 90% | 3415 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,086 psi | 88% | 3291 fps | 99.8% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 42,090 psi | 66% | 3005 fps | 99.4% |
| Accurate High Country | <<locked>> | 80% | 46,151 psi | 72% | 3205 fps | 97.5% |
| Accurate MAGPRO | <<locked>> | 80% | 43,627 psi | 68% | 3133 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 46,064 psi | 72% | 3153 fps | 98.4% |
| ADI AR 2213 | <<locked>> | 80% | 41,365 psi | 65% | 3074 fps | 96.1% |
| ADI AR 2217 | <<locked>> | 86% | 37,811 psi | 59% | 2972 fps | 95.2% |
| ADI AR 2218 | <<locked>> | 98% | 50,299 psi | 79% | 3343 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 84% | 32,300 psi | 51% | 2861 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,939 psi | 83% | 3287 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,035 psi | 72% | 3143 fps | 98.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,076 psi | 66% | 3081 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,785 psi | 64% | 3028 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,244 psi | 55% | 2943 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,253 psi | 72% | 3209 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 51,663 psi | 81% | 3333 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 48,950 psi | 77% | 3176 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 39,146 psi | 61% | 3009 fps | 96.5% |
| Bofors RP30 | <<locked>> | 84% | 37,782 psi | 59% | 2992 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 42,076 psi | 66% | 3081 fps | 97.6% |
| Hodgdon H1000 | <<locked>> | 82% | 35,882 psi | 56% | 2927 fps | 95% |
| Hodgdon H4831 | <<locked>> | 80% | 43,990 psi | 69% | 3081 fps | 96.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,207 psi | 68% | 3064 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,748 psi | 78% | 3146 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 34,389 psi | 54% | 2969 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,123 psi | 44% | 1959 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,750 psi | 81% | 3205 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 52,243 psi | 82% | 3215 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,092 psi | 71% | 3074 fps | 96.8% |
| IMR 7828 SSC | <<locked>> | 80% | 40,074 psi | 63% | 3051 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 92% | 38,957 psi | 61% | 3035 fps | 95.6% |
| Lovex S070 | <<locked>> | 80% | 53,809 psi | 84% | 3241 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,100 psi | 57% | 2861 fps | 98.1% |
| Norma 204 | <<locked>> | 80% | 52,649 psi | 83% | 3261 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 34,200 psi | 54% | 2930 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 44,672 psi | 70% | 3163 fps | 99.2% |
| Norma URP | <<locked>> | 80% | 53,679 psi | 84% | 3261 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,045 psi | 63% | 3061 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 80% | 52,721 psi | 83% | 3264 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,071 psi | 57% | 2920 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,834 psi | 45% | 2005 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 33,736 psi | 53% | 2936 fps | 96.6% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 41,916 psi | 66% | 3114 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 46,934 psi | 74% | 3127 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 80% | 45,585 psi | 71% | 3133 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 80% | 53,809 psi | 84% | 3241 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,237 psi | 71% | 3127 fps | 98.4% |
| Somchem S361 | <<locked>> | 80% | 48,008 psi | 75% | 3107 fps | 97.4% |
| Somchem S365 | <<locked>> | 80% | 51,416 psi | 81% | 3209 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,064 psi | 72% | 3107 fps | 99.1% |
| Vihtavuori N165 | <<locked>> | 80% | 40,190 psi | 63% | 2963 fps | 97.6% |
| Vihtavuori N555 | <<locked>> | 80% | 45,353 psi | 71% | 3117 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,396 psi | 70% | 3153 fps | 96.5% |
| Vihtavuori N565 | <<locked>> | 82% | 39,450 psi | 62% | 3009 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 90% | 46,253 psi | 72% | 3209 fps | 96% |
| Vihtavuori N570 | <<locked>> | 94% | 50,705 psi | 79% | 3343 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,725 psi | 61% | 3077 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,409 psi | 66% | 3022 fps | 97.7% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 64 powders for .30-378 Weath. Mag. loaded with the .308 | 150gr | Speer TBBC. Hodgdon Retumbo delivers the highest muzzle velocity at 3,488 fps; across all powders the maximum-charge window runs from 2,185 fps to 3,488 fps. Accurate 8700 gives the best case fill at 100 %, and 64 of the 64 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 1:14.5 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.