Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 185gr | Berger JUG bullet and 52 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Vihtavuori N570 and Hodgdon Retumbo.
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% | 54,288 psi | 85% | 2972 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,385 psi | 77% | 2992 fps | 97% |
| Accurate High Country | <<locked>> | 82% | 56,086 psi | 88% | 3133 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 57,116 psi | 90% | 3143 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 55,042 psi | 86% | 3054 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 57,609 psi | 90% | 3136 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 56,971 psi | 89% | 3120 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 57,696 psi | 90% | 3258 fps | 99.3% |
| ADI AR 2225 | <<locked>> | 96% | 56,507 psi | 89% | 3143 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 55,114 psi | 86% | 3051 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,679 psi | 86% | 3045 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,447 psi | 85% | 3071 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,391 psi | 88% | 3028 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,058 psi | 89% | 3107 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 57,246 psi | 90% | 3120 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,405 psi | 87% | 3156 fps | 98.7% |
| Alliant Reloder-50 | <<locked>> | 98% | 55,448 psi | 87% | 3146 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,172 psi | 85% | 3031 fps | 98.6% |
| Bofors RP15 | <<locked>> | 88% | 57,638 psi | 90% | 3120 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 56,956 psi | 89% | 3133 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,447 psi | 85% | 3071 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,520 psi | 85% | 3077 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,347 psi | 88% | 3064 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,332 psi | 87% | 3048 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 90% | 56,637 psi | 89% | 3205 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,014 psi | 60% | 1982 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,536 psi | 89% | 3041 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 86% | 56,188 psi | 88% | 3120 fps | 100% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,332 psi | 87% | 3123 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 56,275 psi | 88% | 2999 fps | 100% |
| Norma 217 | <<locked>> | 98% | 56,753 psi | 89% | 3143 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,491 psi | 85% | 3084 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 57,653 psi | 90% | 3146 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 56,188 psi | 88% | 3068 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,986 psi | 61% | 2028 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 57,537 psi | 90% | 3189 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 56,681 psi | 89% | 3159 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 55,361 psi | 87% | 3025 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 54,534 psi | 85% | 3038 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,445 psi | 81% | 3005 fps | 97.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,172 psi | 85% | 3035 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,739 psi | 89% | 3015 fps | 99.8% |
| Somchem S385 | <<locked>> | 82% | 54,824 psi | 86% | 3005 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,955 psi | 86% | 2992 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,215 psi | 85% | 3022 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 82% | 54,476 psi | 85% | 3002 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 57,638 psi | 90% | 3150 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 55,216 psi | 87% | 3084 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 92% | 57,000 psi | 89% | 3159 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 92% | 54,578 psi | 86% | 3166 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 86% | 57,319 psi | 90% | 3123 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,578 psi | 86% | 3002 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 47,442 psi | 74% | 2858 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 45,890 psi | 72% | 2927 fps | 96.1% |
| Accurate High Country | <<locked>> | 80% | 52,359 psi | 82% | 3068 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 80% | 49,530 psi | 78% | 3009 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 80% | 51,488 psi | 81% | 2995 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 46,833 psi | 73% | 2946 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 80% | 34,911 psi | 55% | 2674 fps | 96.5% |
| ADI AR 2218 | 107.1 gr | 90% | 42,786 psi | 67% | 2949 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 32,300 psi | 51% | 2648 fps | 98.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 51,677 psi | 81% | 2992 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,285 psi | 80% | 2989 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,587 psi | 75% | 2946 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,369 psi | 73% | 2871 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,466 psi | 63% | 2822 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 53,156 psi | 83% | 3058 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 41,147 psi | 64% | 2871 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 92% | 44,411 psi | 70% | 2933 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,614 psi | 70% | 2848 fps | 96.5% |
| Bofors RP15 | <<locked>> | 80% | 44,251 psi | 69% | 2881 fps | 99.4% |
| Bofors RP30 | <<locked>> | 80% | 37,826 psi | 59% | 2756 fps | 97.6% |
| Bofors RP5 | <<locked>> | 80% | 47,587 psi | 75% | 2946 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 38,101 psi | 60% | 2759 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 80% | 49,255 psi | 77% | 2940 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,370 psi | 76% | 2923 fps | 99% |
| Hodgdon Retumbo | 89.9 gr | 80% | 39,610 psi | 62% | 2881 fps | 99.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,485 psi | 45% | 1772 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,748 psi | 78% | 2923 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 80% | 45,614 psi | 71% | 2930 fps | 99% |
| IMR 8133 Enduron | <<locked>> | 82% | 31,995 psi | 50% | 2621 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 40,872 psi | 64% | 2730 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 30,153 psi | 47% | 2585 fps | 96.6% |
| Norma MRP | <<locked>> | 80% | 50,836 psi | 80% | 3022 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,209 psi | 72% | 2946 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 80% | 41,713 psi | 65% | 2815 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,298 psi | 46% | 1818 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,102 psi | 61% | 2851 fps | 99.8% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 36,013 psi | 56% | 2736 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 51,909 psi | 81% | 2966 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 51,024 psi | 80% | 2979 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 44,744 psi | 70% | 2877 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,720 psi | 79% | 2972 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 53,069 psi | 83% | 2953 fps | 99.5% |
| Somchem S385 | <<locked>> | 80% | 51,430 psi | 81% | 2949 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,121 psi | 71% | 2825 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 47,456 psi | 74% | 2894 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 51,039 psi | 80% | 2949 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,285 psi | 79% | 3022 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 80% | 42,018 psi | 66% | 2835 fps | 98.1% |
| Vihtavuori N568 | <<locked>> | 80% | 37,130 psi | 58% | 2756 fps | 95.1% |
| Vihtavuori N570 | 100.3 gr | 86% | 43,947 psi | 69% | 2953 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,803 psi | 72% | 2943 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,514 psi | 74% | 2881 fps | 99.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 52 powders for .30-378 Weath. Mag. loaded with the .308 | 185gr | Berger JUG. ADI AR 2218 delivers the highest muzzle velocity at 3,258 fps; across all powders the maximum-charge window runs from 1,982 fps to 3,258 fps. Accurate 8700 gives the best case fill at 100 %, and 52 of the 52 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 185.0 gr projectile in 0.308" calls for a 1:12.0 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. ADI AR 2218, Vihtavuori N570, Hodgdon Retumbo rank at the top here: for .30-378 Weath. Mag. with the .308 | 185gr | Berger JUG they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.