Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Barnes X S bullet and 49 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Hodgdon Retumbo and ReloadSwiss RS 80.
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% | 57,014 psi | 89% | 3031 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 51,750 psi | 81% | 3058 fps | 97.3% |
| Accurate MAGPRO | <<locked>> | 82% | 55,535 psi | 87% | 3140 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 82% | 56,710 psi | 89% | 3107 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 55,666 psi | 87% | 3130 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 54,940 psi | 86% | 3110 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 55,390 psi | 87% | 3238 fps | 98.8% |
| ADI AR 2225 | <<locked>> | 94% | 54,665 psi | 86% | 3143 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 57,043 psi | 89% | 3104 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,492 psi | 89% | 3097 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 56,608 psi | 89% | 3130 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,071 psi | 86% | 3035 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 55,521 psi | 87% | 3110 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 53,940 psi | 85% | 3156 fps | 98.2% |
| Alliant Reloder-50 | <<locked>> | 96% | 54,810 psi | 86% | 3159 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 55,564 psi | 87% | 3081 fps | 98.6% |
| Bofors RP15 | <<locked>> | 86% | 56,014 psi | 88% | 3120 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 55,695 psi | 87% | 3136 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 56,608 psi | 89% | 3130 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 56,318 psi | 88% | 3130 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 54,462 psi | 85% | 3054 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 84% | 57,159 psi | 90% | 3100 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 54,752 psi | 86% | 3202 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,130 psi | 60% | 2005 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 54,549 psi | 85% | 3031 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 84% | 54,288 psi | 85% | 3114 fps | 99.8% |
| IMR 8133 Enduron | <<locked>> | 96% | 54,375 psi | 85% | 3133 fps | 99.9% |
| Lovex S071 | <<locked>> | 88% | 55,753 psi | 87% | 3012 fps | 100% |
| Norma 217 | <<locked>> | 96% | 55,840 psi | 88% | 3159 fps | 100% |
| Norma MRP | <<locked>> | 82% | 56,782 psi | 89% | 3143 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 55,709 psi | 87% | 3140 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 54,534 psi | 85% | 3064 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,320 psi | 62% | 2051 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 55,535 psi | 87% | 3189 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 55,230 psi | 87% | 3163 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 82% | 57,043 psi | 89% | 3074 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 56,550 psi | 89% | 3094 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 53,838 psi | 84% | 3068 fps | 97.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,231 psi | 88% | 3087 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,072 psi | 89% | 3061 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,029 psi | 89% | 3048 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,652 psi | 89% | 3084 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 82% | 57,116 psi | 90% | 3064 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 55,956 psi | 88% | 3146 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 57,711 psi | 90% | 3150 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 55,535 psi | 87% | 3163 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 92% | 56,913 psi | 89% | 3232 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 84% | 55,927 psi | 88% | 3133 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,594 psi | 89% | 3054 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% | 50,386 psi | 79% | 2927 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 45,020 psi | 71% | 2927 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 80% | 51,880 psi | 81% | 3074 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 80% | 53,258 psi | 83% | 3048 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 48,733 psi | 76% | 3005 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 80% | 37,101 psi | 58% | 2749 fps | 97.1% |
| ADI AR 2218 | 106.5 gr | 90% | 44,976 psi | 70% | 3018 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 34,737 psi | 54% | 2733 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 53,621 psi | 84% | 3048 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,098 psi | 83% | 3041 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,777 psi | 78% | 3012 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,660 psi | 76% | 2933 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,757 psi | 67% | 2887 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 43,714 psi | 69% | 2949 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 90% | 44,527 psi | 70% | 2956 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,006 psi | 72% | 2900 fps | 96.6% |
| Bofors RP15 | <<locked>> | 80% | 46,456 psi | 73% | 2946 fps | 99.5% |
| Bofors RP30 | <<locked>> | 80% | 40,451 psi | 63% | 2838 fps | 98.1% |
| Bofors RP5 | <<locked>> | 80% | 49,777 psi | 78% | 3012 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 40,234 psi | 63% | 2825 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 80% | 50,966 psi | 80% | 2992 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,270 psi | 79% | 2979 fps | 99.1% |
| Hodgdon Retumbo | 89.4 gr | 80% | 41,858 psi | 66% | 2956 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,848 psi | 45% | 1798 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,358 psi | 80% | 2972 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 80% | 47,645 psi | 75% | 2989 fps | 99.2% |
| IMR 8133 Enduron | <<locked>> | 80% | 32,634 psi | 51% | 2657 fps | 95.2% |
| Lovex S071 | <<locked>> | 80% | 43,976 psi | 69% | 2808 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,040 psi | 52% | 2690 fps | 97.7% |
| Norma MRP | <<locked>> | 80% | 53,142 psi | 83% | 3084 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,443 psi | 76% | 3012 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 80% | 44,077 psi | 69% | 2884 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,602 psi | 46% | 1837 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,669 psi | 65% | 2933 fps | 100% |
| ReloadSwiss RS 80 | 96.4 gr | 80% | 38,783 psi | 61% | 2828 fps | 96.2% |
| Rottweil R 904 | <<locked>> | 80% | 53,577 psi | 84% | 3015 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 53,127 psi | 83% | 3035 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 47,326 psi | 74% | 2949 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,765 psi | 83% | 3031 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,722 psi | 84% | 3009 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,253 psi | 74% | 2884 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 49,821 psi | 78% | 2959 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 80% | 53,867 psi | 84% | 3015 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,373 psi | 82% | 3084 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 80% | 44,730 psi | 70% | 2910 fps | 98.5% |
| Vihtavuori N568 | <<locked>> | 80% | 39,624 psi | 62% | 2838 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 84% | 43,352 psi | 68% | 2959 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 48,530 psi | 76% | 3018 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,617 psi | 78% | 2940 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 49 powders for .30-378 Weath. Mag. loaded with the .308 | 180gr | Barnes X S. ADI AR 2218 delivers the highest muzzle velocity at 3,238 fps; across all powders the maximum-charge window runs from 2,005 fps to 3,238 fps. Accurate 8700 gives the best case fill at 100 %, and 49 of the 49 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 1:12.0 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, Hodgdon Retumbo, ReloadSwiss RS 80 rank at the top here: for .30-378 Weath. Mag. with the .308 | 180gr | Barnes X S 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.