Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 190gr | Remington SP Extended-Range BT bullet and 40 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>> | 82% | 54,331 psi | 85% | 2936 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 54,491 psi | 85% | 3048 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 82% | 57,406 psi | 90% | 3114 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 82% | 53,867 psi | 84% | 3041 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 57,580 psi | 90% | 3091 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 54,215 psi | 85% | 3163 fps | 99.2% |
| ADI AR 2225 | <<locked>> | 94% | 57,696 psi | 90% | 3117 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 54,549 psi | 85% | 3035 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,724 psi | 89% | 2995 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 53,954 psi | 85% | 3018 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 56,550 psi | 89% | 3140 fps | 99.1% |
| Alliant Reloder-50 | <<locked>> | 96% | 56,927 psi | 89% | 3133 fps | 98.9% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 54,099 psi | 85% | 3005 fps | 98.9% |
| Bofors RP15 | <<locked>> | 84% | 54,259 psi | 85% | 3028 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 57,725 psi | 90% | 3107 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 54,549 psi | 85% | 3035 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 54,911 psi | 86% | 3048 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 56,246 psi | 88% | 3031 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 82% | 55,143 psi | 86% | 3012 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 86% | 53,708 psi | 84% | 3114 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,145 psi | 60% | 1975 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 56,202 psi | 88% | 3005 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 84% | 56,594 psi | 89% | 3091 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,911 psi | 86% | 2959 fps | 96.3% |
| IMR 8133 Enduron | <<locked>> | 96% | 56,579 psi | 89% | 3104 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 56,536 psi | 89% | 2969 fps | 100% |
| Norma 217 | <<locked>> | 94% | 54,389 psi | 85% | 3064 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 53,998 psi | 85% | 3048 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 56,623 psi | 89% | 3038 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,247 psi | 62% | 2024 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 54,244 psi | 85% | 3094 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 57,624 psi | 90% | 3136 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 56,014 psi | 88% | 3051 fps | 98.4% |
| Vihtavuori N165 | <<locked>> | 84% | 54,926 psi | 86% | 2963 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 54,447 psi | 85% | 2995 fps | 97.7% |
| Vihtavuori N565 | <<locked>> | 86% | 55,651 psi | 87% | 3058 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 53,983 psi | 85% | 3074 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 90% | 55,564 psi | 87% | 3143 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 82% | 54,186 psi | 85% | 3031 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 54,520 psi | 85% | 2969 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 50,763 psi | 80% | 2881 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 43,540 psi | 68% | 2841 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 80% | 53,505 psi | 84% | 3048 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 50,357 psi | 79% | 2979 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 80% | 37,739 psi | 59% | 2717 fps | 98% |
| ADI AR 2218 | <<locked>> | 86% | 40,393 psi | 63% | 2858 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 80% | 35,172 psi | 55% | 2694 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 51,097 psi | 80% | 2976 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,748 psi | 78% | 2887 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,903 psi | 69% | 2848 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 84% | 41,945 psi | 66% | 2851 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 88% | 42,250 psi | 66% | 2848 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,398 psi | 74% | 2877 fps | 97.7% |
| Bofors RP15 | <<locked>> | 80% | 47,500 psi | 74% | 2910 fps | 99.9% |
| Bofors RP30 | <<locked>> | 80% | 41,017 psi | 64% | 2795 fps | 98.8% |
| Bofors RP5 | <<locked>> | 80% | 51,097 psi | 80% | 2976 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 41,234 psi | 65% | 2795 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 80% | 52,533 psi | 82% | 2969 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,648 psi | 81% | 2953 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 80% | 43,265 psi | 68% | 2923 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,689 psi | 45% | 1768 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,649 psi | 83% | 2946 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 80% | 49,255 psi | 77% | 2966 fps | 99.7% |
| IMR 7977 Enduron | <<locked>> | 86% | 51,517 psi | 81% | 2900 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 80% | 32,721 psi | 51% | 2605 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 43,947 psi | 69% | 2759 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,272 psi | 52% | 2635 fps | 98.2% |
| Ramshot Grand | <<locked>> | 80% | 50,183 psi | 79% | 2986 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 45,223 psi | 71% | 2848 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,501 psi | 46% | 1811 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 43,076 psi | 68% | 2897 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 39,581 psi | 62% | 2789 fps | 97.1% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 42,656 psi | 67% | 2799 fps | 95.1% |
| Vihtavuori N165 | <<locked>> | 80% | 48,153 psi | 75% | 2848 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 44,512 psi | 70% | 2805 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 80% | 45,426 psi | 71% | 2871 fps | 99.1% |
| Vihtavuori N568 | <<locked>> | 80% | 40,466 psi | 63% | 2802 fps | 96.8% |
| Vihtavuori N570 | <<locked>> | 82% | 41,611 psi | 65% | 2861 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 50,314 psi | 79% | 2972 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,894 psi | 80% | 2910 fps | 100% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 47 powders for .30-378 Weath. Mag. loaded with the .308 | 190gr | Remington SP Extended-Range BT. ADI AR 2218 delivers the highest muzzle velocity at 3,163 fps; across all powders the maximum-charge window runs from 1,975 fps to 3,163 fps. Accurate 8700 gives the best case fill at 100 %, and 47 of the 47 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 190.0 gr projectile in 0.308" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, 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. As outliers, Hodgdon 50BMG, Hodgdon US 869, 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.