Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 150gr | Barnes TAC-X bullet and 67 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>> | 90% | 55,927 psi | 88% | 3271 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,289 psi | 88% | 3301 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 53,998 psi | 85% | 3373 fps | 99% |
| Accurate MAGPRO | <<locked>> | 88% | 55,100 psi | 86% | 3376 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 88% | 57,711 psi | 90% | 3379 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 90% | 55,999 psi | 88% | 3383 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 98% | 54,447 psi | 85% | 3346 fps | 99.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,794 psi | 83% | 3363 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,711 psi | 90% | 3369 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,116 psi | 90% | 3360 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,246 psi | 88% | 3376 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 54,114 psi | 85% | 3281 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 54,201 psi | 85% | 3350 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 54,505 psi | 85% | 3366 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,492 psi | 89% | 3432 fps | 97.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,942 psi | 89% | 3333 fps | 97.3% |
| Bofors RP15 | <<locked>> | 92% | 55,434 psi | 87% | 3360 fps | 99.7% |
| Bofors RP30 | <<locked>> | 96% | 53,896 psi | 84% | 3350 fps | 99.3% |
| Bofors RP5 | <<locked>> | 90% | 56,246 psi | 88% | 3376 fps | 99.8% |
| Bofors RP7 | <<locked>> | 82% | 57,740 psi | 90% | 3307 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 56,028 psi | 88% | 3373 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 88% | 55,158 psi | 86% | 3307 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 54,157 psi | 85% | 3291 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,711 psi | 90% | 3281 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 57,043 psi | 89% | 3504 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,304 psi | 58% | 2172 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,318 psi | 88% | 3291 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,695 psi | 89% | 3291 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,869 psi | 88% | 3291 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 90% | 54,085 psi | 85% | 3360 fps | 99% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,138 psi | 75% | 3255 fps | 98.3% |
| Lovex S065 | <<locked>> | 82% | 56,420 psi | 88% | 3271 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 54,824 psi | 86% | 3264 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,305 psi | 90% | 3294 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,725 psi | 90% | 3353 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 48,805 psi | 76% | 3281 fps | 99.7% |
| Norma MRP | <<locked>> | 88% | 56,246 psi | 88% | 3396 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,679 psi | 86% | 3284 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 55,158 psi | 86% | 3379 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 84% | 57,522 psi | 90% | 3350 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 53,780 psi | 84% | 3301 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,130 psi | 60% | 2221 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,695 psi | 89% | 3323 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,434 psi | 87% | 3356 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 53,969 psi | 85% | 3422 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 57,740 psi | 90% | 3445 fps | 99% |
| Rottweil R 904 | <<locked>> | 86% | 54,607 psi | 86% | 3274 fps | 99% |
| Rottweil R 905 | <<locked>> | 88% | 56,811 psi | 89% | 3350 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 82% | 57,740 psi | 90% | 3307 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,420 psi | 88% | 3271 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 54,824 psi | 86% | 3264 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,419 psi | 87% | 3215 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,420 psi | 88% | 3346 fps | 99.8% |
| Somchem S361 | <<locked>> | 86% | 56,202 psi | 88% | 3264 fps | 98.8% |
| Somchem S365 | <<locked>> | 84% | 55,840 psi | 88% | 3287 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,145 psi | 90% | 3314 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,275 psi | 88% | 3274 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,087 psi | 89% | 3294 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 82% | 55,550 psi | 87% | 3278 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,825 psi | 87% | 3310 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,825 psi | 87% | 3392 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 94% | 56,376 psi | 88% | 3373 fps | 99.1% |
| Vihtavuori N568 | <<locked>> | 96% | 54,012 psi | 85% | 3373 fps | 97.9% |
| Vihtavuori N570 | <<locked>> | 98% | 55,201 psi | 87% | 3435 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,985 psi | 88% | 3215 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,653 psi | 90% | 3432 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,319 psi | 90% | 3314 fps | 99.8% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 39,305 psi | 62% | 2946 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 52,373 psi | 82% | 3238 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 43,308 psi | 68% | 3146 fps | 96.6% |
| Accurate MAGPRO | <<locked>> | 82% | 44,150 psi | 69% | 3150 fps | 95.6% |
| ADI AR 2209 | <<locked>> | 80% | 43,671 psi | 68% | 3104 fps | 97.8% |
| ADI AR 2213 | <<locked>> | 80% | 39,030 psi | 61% | 3018 fps | 95% |
| ADI AR 2217 | <<locked>> | 88% | 38,087 psi | 60% | 2986 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 86% | 32,285 psi | 51% | 2864 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,372 psi | 79% | 3248 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,627 psi | 68% | 3094 fps | 97.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,566 psi | 62% | 3028 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,247 psi | 60% | 2979 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,880 psi | 52% | 2877 fps | 97.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,149 psi | 68% | 3153 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 52,083 psi | 82% | 3350 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 50,009 psi | 78% | 3199 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 36,651 psi | 57% | 2949 fps | 95.4% |
| Bofors RP30 | <<locked>> | 86% | 37,782 psi | 59% | 2999 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 39,566 psi | 62% | 3028 fps | 96.7% |
| Bofors RP7 | <<locked>> | 80% | 54,099 psi | 85% | 3245 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 38,899 psi | 61% | 3009 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 80% | 41,684 psi | 65% | 3031 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,915 psi | 64% | 3012 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,239 psi | 74% | 3107 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 82% | 34,505 psi | 54% | 2976 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,891 psi | 44% | 1949 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,414 psi | 77% | 3166 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 49,516 psi | 78% | 3169 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,917 psi | 67% | 3028 fps | 96% |
| IMR 7828 SSC | <<locked>> | 82% | 40,553 psi | 64% | 3068 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 94% | 38,827 psi | 61% | 3041 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 52,924 psi | 83% | 3209 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,256 psi | 80% | 3202 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 33,576 psi | 53% | 2802 fps | 97.2% |
| Norma 204 | <<locked>> | 80% | 50,241 psi | 79% | 3219 fps | 98.9% |
| Norma 217 | <<locked>> | 90% | 33,750 psi | 53% | 2923 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 41,872 psi | 66% | 3107 fps | 98.6% |
| Norma URP | <<locked>> | 80% | 51,024 psi | 80% | 3222 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 40,495 psi | 63% | 3074 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 80% | 50,212 psi | 79% | 3222 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,489 psi | 52% | 2854 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,558 psi | 45% | 1995 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,765 psi | 83% | 3261 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,430 psi | 81% | 3287 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 31,357 psi | 49% | 2861 fps | 95% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 42,076 psi | 66% | 3123 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 44,643 psi | 70% | 3077 fps | 97% |
| Rottweil R 905 | <<locked>> | 80% | 43,018 psi | 67% | 3081 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 80% | 54,099 psi | 85% | 3245 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,924 psi | 83% | 3209 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,256 psi | 80% | 3202 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,779 psi | 81% | 3153 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,685 psi | 67% | 3074 fps | 97.7% |
| Somchem S361 | <<locked>> | 80% | 45,701 psi | 72% | 3061 fps | 96.6% |
| Somchem S365 | <<locked>> | 80% | 48,530 psi | 76% | 3166 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,526 psi | 68% | 3054 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 80% | 52,518 psi | 82% | 3215 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,826 psi | 59% | 2910 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 80% | 51,909 psi | 81% | 3215 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,540 psi | 67% | 3068 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,771 psi | 65% | 3097 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 84% | 39,595 psi | 62% | 3018 fps | 95% |
| Vihtavuori N568 | <<locked>> | 92% | 46,543 psi | 73% | 3222 fps | 96% |
| Vihtavuori N570 | <<locked>> | 96% | 51,126 psi | 80% | 3356 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,199 psi | 82% | 3159 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,607 psi | 56% | 3015 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,074 psi | 63% | 2972 fps | 96.9% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 73 powders for .30-378 Weath. Mag. loaded with the .308 | 150gr | Barnes TAC-X. Hodgdon Retumbo delivers the highest muzzle velocity at 3,504 fps; across all powders the maximum-charge window runs from 2,172 fps to 3,504 fps. ADI AR 2218 gives the best case fill at 100 %, and 73 of the 73 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-33 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, Alliant Reloder-50, 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.