Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | 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>> | 84% | 55,114 psi | 86% | 3018 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 50,618 psi | 79% | 3045 fps | 97.2% |
| Accurate High Country | <<locked>> | 82% | 57,058 psi | 89% | 3186 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 54,230 psi | 85% | 3130 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 82% | 55,941 psi | 88% | 3107 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 54,810 psi | 86% | 3127 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 54,186 psi | 85% | 3107 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 54,679 psi | 86% | 3235 fps | 98.8% |
| ADI AR 2225 | <<locked>> | 94% | 53,751 psi | 84% | 3133 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,579 psi | 87% | 3097 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 55,419 psi | 87% | 3120 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 57,305 psi | 90% | 3077 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 54,462 psi | 85% | 3100 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 56,855 psi | 89% | 3212 fps | 98.8% |
| Alliant Reloder-50 | <<locked>> | 98% | 56,942 psi | 89% | 3202 fps | 98.4% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 55,013 psi | 86% | 3084 fps | 98.6% |
| Bofors RP15 | <<locked>> | 86% | 54,810 psi | 86% | 3110 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 54,230 psi | 85% | 3120 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 55,419 psi | 87% | 3120 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 55,579 psi | 87% | 3130 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 57,246 psi | 90% | 3114 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 56,260 psi | 88% | 3097 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 53,925 psi | 85% | 3196 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,898 psi | 59% | 2018 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 57,261 psi | 90% | 3091 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 86% | 57,145 psi | 90% | 3169 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 55,927 psi | 88% | 3035 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 98% | 56,579 psi | 89% | 3173 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 57,203 psi | 90% | 3051 fps | 100% |
| Norma 217 | <<locked>> | 96% | 54,317 psi | 85% | 3136 fps | 100% |
| Norma MRP | <<locked>> | 82% | 55,448 psi | 87% | 3133 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 54,708 psi | 86% | 3133 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 57,334 psi | 90% | 3120 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,001 psi | 61% | 2064 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 54,665 psi | 86% | 3176 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 53,911 psi | 84% | 3146 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 82% | 56,086 psi | 88% | 3071 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 55,463 psi | 87% | 3087 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 52,591 psi | 82% | 3058 fps | 97.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 55,085 psi | 86% | 3084 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 57,609 psi | 90% | 3064 fps | 99.8% |
| Somchem S385 | <<locked>> | 82% | 55,666 psi | 87% | 3054 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,796 psi | 87% | 3041 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 55,303 psi | 87% | 3074 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 82% | 55,361 psi | 87% | 3051 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 54,781 psi | 86% | 3136 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 88% | 56,246 psi | 88% | 3136 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 54,273 psi | 85% | 3146 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 92% | 55,811 psi | 87% | 3215 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 84% | 54,549 psi | 85% | 3114 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 55,434 psi | 87% | 3051 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 48,254 psi | 76% | 2904 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 43,642 psi | 68% | 2904 fps | 95.1% |
| Accurate High Country | <<locked>> | 80% | 53,243 psi | 83% | 3120 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 80% | 50,473 psi | 79% | 3058 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 80% | 52,301 psi | 82% | 3045 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 47,601 psi | 75% | 2992 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 80% | 35,607 psi | 56% | 2723 fps | 96.6% |
| ADI AR 2218 | <<locked>> | 90% | 43,714 psi | 69% | 2999 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 32,924 psi | 52% | 2690 fps | 98.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,083 psi | 82% | 3035 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 48,399 psi | 76% | 2995 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 47,123 psi | 74% | 2917 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 41,278 psi | 65% | 2867 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 41,989 psi | 66% | 2917 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 92% | 45,498 psi | 71% | 2982 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,194 psi | 71% | 2894 fps | 96.5% |
| Bofors RP15 | <<locked>> | 80% | 45,049 psi | 71% | 2927 fps | 99.4% |
| Bofors RP30 | <<locked>> | 80% | 38,580 psi | 60% | 2802 fps | 97.6% |
| Bofors RP5 | <<locked>> | 80% | 48,399 psi | 76% | 2995 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 38,769 psi | 61% | 2802 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 80% | 49,951 psi | 78% | 2986 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,081 psi | 77% | 2972 fps | 99% |
| Hodgdon Retumbo | <<locked>> | 80% | 40,408 psi | 63% | 2930 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,587 psi | 45% | 1808 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,444 psi | 79% | 2972 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 80% | 46,427 psi | 73% | 2976 fps | 99.1% |
| IMR 7977 Enduron | <<locked>> | 88% | 52,417 psi | 82% | 2976 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 82% | 32,663 psi | 51% | 2664 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 41,524 psi | 65% | 2776 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 30,908 psi | 48% | 2631 fps | 96.7% |
| Norma MRP | <<locked>> | 80% | 51,706 psi | 81% | 3068 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 47,094 psi | 74% | 2995 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 80% | 42,482 psi | 67% | 2861 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,370 psi | 46% | 1850 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,972 psi | 63% | 2900 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 36,796 psi | 58% | 2779 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 52,721 psi | 83% | 3015 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 51,880 psi | 81% | 3028 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 45,803 psi | 72% | 2927 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 51,561 psi | 81% | 3025 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 53,824 psi | 84% | 3005 fps | 99.6% |
| Somchem S385 | <<locked>> | 80% | 52,185 psi | 82% | 2995 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,818 psi | 72% | 2871 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 48,211 psi | 76% | 2943 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 51,967 psi | 81% | 2999 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 51,111 psi | 80% | 3071 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 80% | 42,830 psi | 67% | 2881 fps | 98.1% |
| Vihtavuori N568 | <<locked>> | 80% | 37,884 psi | 59% | 2802 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 86% | 44,846 psi | 70% | 2999 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,876 psi | 73% | 2995 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 48,356 psi | 76% | 2930 fps | 99.8% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 51 powders for .30-378 Weath. Mag. loaded with the .308 | 180gr | Sierra Pro-Hunter. ADI AR 2218 delivers the highest muzzle velocity at 3,235 fps; across all powders the maximum-charge window runs from 2,018 fps to 3,235 fps. Accurate 8700 gives the best case fill at 100 %, and 51 of the 51 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 180.0 gr projectile in 0.308" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, ReloadSwiss RS 14 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.