Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Sierra HP MatchKing 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 86% | 57,464 psi | 90% | 3054 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 48,820 psi | 77% | 3012 fps | 96.6% |
| Accurate High Country | <<locked>> | 82% | 55,550 psi | 87% | 3159 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 84% | 56,507 psi | 89% | 3169 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 82% | 54,621 psi | 86% | 3084 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 57,232 psi | 90% | 3166 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 56,420 psi | 88% | 3146 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 57,043 psi | 89% | 3278 fps | 99.1% |
| ADI AR 2225 | <<locked>> | 96% | 55,854 psi | 88% | 3169 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,317 psi | 85% | 3074 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 57,725 psi | 90% | 3159 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,912 psi | 88% | 3058 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 56,608 psi | 89% | 3140 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 56,594 psi | 89% | 3146 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 54,998 psi | 86% | 3182 fps | 98.4% |
| Alliant Reloder-50 | <<locked>> | 98% | 54,969 psi | 86% | 3173 fps | 98% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 57,406 psi | 90% | 3120 fps | 98.9% |
| Bofors RP15 | <<locked>> | 88% | 57,072 psi | 89% | 3150 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 56,449 psi | 88% | 3159 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 57,725 psi | 90% | 3159 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 53,824 psi | 84% | 3100 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 55,869 psi | 88% | 3094 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 54,868 psi | 86% | 3074 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 90% | 56,057 psi | 88% | 3235 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,971 psi | 60% | 2011 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,999 psi | 88% | 3068 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 86% | 55,637 psi | 87% | 3146 fps | 99.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 54,897 psi | 86% | 3150 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 55,782 psi | 87% | 3028 fps | 100% |
| Norma 217 | <<locked>> | 98% | 56,275 psi | 88% | 3173 fps | 100% |
| Norma MRP | <<locked>> | 82% | 53,954 psi | 85% | 3110 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 57,174 psi | 90% | 3173 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 55,651 psi | 87% | 3094 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,943 psi | 61% | 2057 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 57,014 psi | 89% | 3219 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 56,144 psi | 88% | 3186 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 55,013 psi | 86% | 3054 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 82% | 54,143 psi | 85% | 3068 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 50,923 psi | 80% | 3025 fps | 96.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 57,392 psi | 90% | 3123 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,246 psi | 88% | 3041 fps | 99.7% |
| Somchem S385 | <<locked>> | 82% | 54,433 psi | 85% | 3035 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,462 psi | 85% | 3022 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 57,551 psi | 90% | 3110 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 84% | 57,653 psi | 90% | 3087 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 57,246 psi | 90% | 3179 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 54,737 psi | 86% | 3114 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 92% | 56,565 psi | 89% | 3189 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 92% | 53,983 psi | 85% | 3189 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 86% | 56,768 psi | 89% | 3153 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,099 psi | 85% | 3028 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 46,934 psi | 74% | 2884 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 45,397 psi | 71% | 2943 fps | 95.6% |
| Accurate High Country | <<locked>> | 80% | 51,909 psi | 81% | 3097 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 80% | 49,052 psi | 77% | 3031 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 80% | 51,140 psi | 80% | 3025 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 46,311 psi | 73% | 2969 fps | 98.9% |
| ADI AR 2217 | <<locked>> | 80% | 34,621 psi | 54% | 2697 fps | 96.1% |
| ADI AR 2218 | <<locked>> | 90% | 42,438 psi | 67% | 2969 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 31,908 psi | 50% | 2664 fps | 98% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,807 psi | 80% | 3015 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,094 psi | 74% | 2972 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,919 psi | 72% | 2897 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,118 psi | 63% | 2844 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 52,576 psi | 82% | 3084 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 43,830 psi | 69% | 2963 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 92% | 43,947 psi | 69% | 2953 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,251 psi | 69% | 2874 fps | 96.1% |
| Bofors RP15 | <<locked>> | 80% | 43,918 psi | 69% | 2907 fps | 99.2% |
| Bofors RP30 | <<locked>> | 80% | 37,362 psi | 59% | 2776 fps | 97.2% |
| Bofors RP5 | <<locked>> | 80% | 47,094 psi | 74% | 2972 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 80% | 37,637 psi | 59% | 2776 fps | 97.8% |
| Hodgdon H4831 | <<locked>> | 80% | 48,762 psi | 76% | 2966 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,892 psi | 75% | 2949 fps | 98.8% |
| Hodgdon Retumbo | <<locked>> | 80% | 39,088 psi | 61% | 2900 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,427 psi | 45% | 1798 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,429 psi | 77% | 2949 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 80% | 45,107 psi | 71% | 2953 fps | 98.8% |
| IMR 8133 Enduron | <<locked>> | 84% | 33,939 psi | 53% | 2707 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 40,495 psi | 63% | 2756 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 29,849 psi | 47% | 2605 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 50,357 psi | 79% | 3048 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 45,716 psi | 72% | 2969 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 80% | 41,278 psi | 65% | 2838 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,240 psi | 46% | 1841 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,638 psi | 61% | 2874 fps | 99.7% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 38,464 psi | 60% | 2828 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 51,619 psi | 81% | 2995 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 80% | 50,705 psi | 79% | 3005 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 47,558 psi | 75% | 2963 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,357 psi | 79% | 3005 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 52,649 psi | 83% | 2982 fps | 99.4% |
| Somchem S385 | <<locked>> | 80% | 50,952 psi | 80% | 2976 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,643 psi | 70% | 2848 fps | 99.6% |
| Vihtavuori N170 | <<locked>> | 86% | 46,963 psi | 74% | 2917 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 50,691 psi | 79% | 2979 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,821 psi | 78% | 3048 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 80% | 41,640 psi | 65% | 2854 fps | 97.7% |
| Vihtavuori N568 | <<locked>> | 82% | 39,436 psi | 62% | 2844 fps | 95.7% |
| Vihtavuori N570 | <<locked>> | 86% | 43,381 psi | 68% | 2969 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,281 psi | 71% | 2972 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,166 psi | 74% | 2907 fps | 99.7% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 59 powders for .30-378 Weath. Mag. loaded with the .308 | 180gr | Sierra HP MatchKing. ADI AR 2218 delivers the highest muzzle velocity at 3,278 fps; across all powders the maximum-charge window runs from 2,011 fps to 3,278 fps. Accurate 8700 gives the best case fill at 100 %, and 59 of the 59 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:13.0 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 50BMG, Hodgdon US 869, 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.