Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 170gr | Sierra Pro-Hunter bullet and 51 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>> | 86% | 57,392 psi | 90% | 3127 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,095 psi | 77% | 3077 fps | 96.2% |
| Accurate High Country | <<locked>> | 82% | 55,521 psi | 87% | 3232 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 84% | 56,594 psi | 89% | 3241 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 82% | 54,505 psi | 85% | 3156 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 57,116 psi | 90% | 3238 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 56,420 psi | 88% | 3219 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 57,232 psi | 90% | 3346 fps | 98.8% |
| ADI AR 2225 | <<locked>> | 96% | 55,956 psi | 88% | 3238 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,331 psi | 85% | 3146 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 57,609 psi | 90% | 3232 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,825 psi | 87% | 3130 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 56,652 psi | 89% | 3212 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 56,739 psi | 89% | 3222 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,114 psi | 86% | 3251 fps | 98.1% |
| Alliant Reloder-50 | <<locked>> | 98% | 55,216 psi | 87% | 3238 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 57,421 psi | 90% | 3192 fps | 98.6% |
| Bofors RP15 | <<locked>> | 88% | 57,145 psi | 90% | 3225 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 56,492 psi | 89% | 3232 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 57,609 psi | 90% | 3232 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 53,983 psi | 85% | 3176 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 55,854 psi | 88% | 3163 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 84% | 54,897 psi | 86% | 3146 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 90% | 56,043 psi | 88% | 3307 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,869 psi | 59% | 2073 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,086 psi | 88% | 3140 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 86% | 55,738 psi | 87% | 3222 fps | 99.8% |
| IMR 8133 Enduron | <<locked>> | 98% | 54,911 psi | 86% | 3219 fps | 99.9% |
| Lovex S071 | <<locked>> | 90% | 55,796 psi | 87% | 3104 fps | 100% |
| Norma 217 | <<locked>> | 98% | 56,434 psi | 88% | 3245 fps | 100% |
| Norma MRP | <<locked>> | 82% | 53,925 psi | 85% | 3182 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 57,058 psi | 89% | 3245 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 55,651 psi | 87% | 3166 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,928 psi | 61% | 2123 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 57,130 psi | 90% | 3291 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 56,217 psi | 88% | 3255 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 82% | 54,955 psi | 86% | 3127 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 84% | 57,711 psi | 90% | 3199 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,068 psi | 80% | 3091 fps | 96.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 57,334 psi | 90% | 3196 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,275 psi | 88% | 3114 fps | 99.6% |
| Somchem S385 | <<locked>> | 82% | 54,375 psi | 85% | 3107 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,418 psi | 85% | 3091 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 57,696 psi | 90% | 3182 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 84% | 57,638 psi | 90% | 3163 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 57,246 psi | 90% | 3255 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 88% | 54,737 psi | 86% | 3182 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 92% | 56,710 psi | 89% | 3261 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 92% | 54,114 psi | 85% | 3258 fps | 97.6% |
| Winchester StaBALL HD | <<locked>> | 86% | 56,710 psi | 89% | 3228 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,041 psi | 85% | 3100 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 46,934 psi | 74% | 2953 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 45,513 psi | 71% | 3005 fps | 95.1% |
| Accurate High Country | <<locked>> | 80% | 51,822 psi | 81% | 3166 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 80% | 49,066 psi | 77% | 3100 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 80% | 51,024 psi | 80% | 3094 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 46,253 psi | 72% | 3038 fps | 98.6% |
| ADI AR 2217 | <<locked>> | 80% | 34,548 psi | 54% | 2753 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 92% | 45,687 psi | 72% | 3104 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 31,879 psi | 50% | 2717 fps | 97.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,778 psi | 80% | 3084 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,036 psi | 74% | 3038 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,818 psi | 72% | 2966 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,987 psi | 63% | 2907 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 52,533 psi | 82% | 3156 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 43,830 psi | 69% | 3022 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 94% | 47,427 psi | 74% | 3087 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,150 psi | 69% | 2936 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 43,801 psi | 69% | 2969 fps | 98.9% |
| Bofors RP30 | <<locked>> | 80% | 37,333 psi | 59% | 2835 fps | 96.7% |
| Bofors RP5 | <<locked>> | 80% | 47,036 psi | 74% | 3038 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 80% | 37,579 psi | 59% | 2838 fps | 97.4% |
| Hodgdon H4831 | <<locked>> | 80% | 48,675 psi | 76% | 3031 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,834 psi | 75% | 3015 fps | 98.5% |
| Hodgdon Retumbo | <<locked>> | 80% | 39,044 psi | 61% | 2963 fps | 98.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,442 psi | 45% | 1860 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,313 psi | 77% | 3018 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 80% | 45,078 psi | 71% | 3018 fps | 98.4% |
| IMR 8133 Enduron | <<locked>> | 84% | 33,953 psi | 53% | 2762 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 40,451 psi | 63% | 2822 fps | 99.7% |
| Norma 217 | <<locked>> | 80% | 29,747 psi | 47% | 2654 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 50,314 psi | 79% | 3117 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 45,687 psi | 72% | 3035 fps | 98.9% |
| Ramshot Magnum | <<locked>> | 80% | 41,162 psi | 65% | 2897 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,211 psi | 46% | 1903 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,566 psi | 60% | 2930 fps | 99.4% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 38,406 psi | 60% | 2884 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 51,517 psi | 81% | 3068 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 80% | 50,575 psi | 79% | 3077 fps | 99.8% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 47,616 psi | 75% | 3022 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,227 psi | 79% | 3071 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 52,649 psi | 83% | 3051 fps | 99.2% |
| Somchem S385 | <<locked>> | 80% | 50,894 psi | 80% | 3045 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,643 psi | 70% | 2917 fps | 99.5% |
| Vihtavuori N170 | <<locked>> | 88% | 50,372 psi | 79% | 3048 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 50,618 psi | 79% | 3051 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,777 psi | 78% | 3117 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 80% | 41,626 psi | 65% | 2917 fps | 97.3% |
| Vihtavuori N568 | <<locked>> | 82% | 39,494 psi | 62% | 2904 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 88% | 46,789 psi | 73% | 3107 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,208 psi | 71% | 3038 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,050 psi | 74% | 2972 fps | 99.5% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 58 powders for .30-378 Weath. Mag. loaded with the .308 | 170gr | Sierra Pro-Hunter. ADI AR 2218 delivers the highest muzzle velocity at 3,346 fps; across all powders the maximum-charge window runs from 2,073 fps to 3,346 fps. Accurate 8700 gives the best case fill at 100 %, and 58 of the 58 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 170.0 gr projectile in 0.308" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, Hodgdon US 869 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, Hodgdon US 869, Lovex D100, Ramshot LRT 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.