Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | MAKER Expanding Subsonic bullet and 50 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 Alliant Reloder-33.
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>> | 86% | 57,508 psi | 90% | 3054 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 48,878 psi | 77% | 3012 fps | 96.6% |
| Accurate MAGPRO | <<locked>> | 84% | 56,594 psi | 89% | 3169 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 82% | 54,549 psi | 85% | 3084 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 57,101 psi | 89% | 3163 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 56,318 psi | 88% | 3143 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 57,000 psi | 89% | 3274 fps | 99% |
| ADI AR 2225 | <<locked>> | 96% | 55,738 psi | 87% | 3166 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,215 psi | 85% | 3071 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 57,638 psi | 90% | 3156 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,825 psi | 87% | 3054 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 56,492 psi | 89% | 3133 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 56,637 psi | 89% | 3146 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 54,882 psi | 86% | 3179 fps | 98.4% |
| Alliant Reloder-50 | <<locked>> | 98% | 54,853 psi | 86% | 3169 fps | 98% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 57,319 psi | 90% | 3120 fps | 98.9% |
| Bofors RP15 | <<locked>> | 88% | 57,000 psi | 89% | 3146 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 56,318 psi | 88% | 3156 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 57,638 psi | 90% | 3156 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 53,925 psi | 85% | 3104 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 55,767 psi | 87% | 3087 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 54,795 psi | 86% | 3074 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,941 psi | 88% | 3232 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,869 psi | 59% | 2008 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,086 psi | 88% | 3068 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 86% | 55,738 psi | 87% | 3146 fps | 99.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 54,824 psi | 86% | 3146 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 55,666 psi | 87% | 3028 fps | 100% |
| Norma 217 | <<locked>> | 98% | 56,173 psi | 88% | 3169 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,041 psi | 85% | 3110 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 57,043 psi | 89% | 3169 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 55,521 psi | 87% | 3094 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,972 psi | 61% | 2057 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 56,913 psi | 89% | 3215 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 56,043 psi | 88% | 3182 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 54,911 psi | 86% | 3051 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 82% | 54,041 psi | 85% | 3064 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 50,879 psi | 80% | 3028 fps | 96.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 57,450 psi | 90% | 3123 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,333 psi | 88% | 3045 fps | 99.7% |
| Somchem S385 | <<locked>> | 82% | 54,317 psi | 85% | 3031 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,534 psi | 85% | 3022 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 57,493 psi | 90% | 3107 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 84% | 57,537 psi | 90% | 3084 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 57,116 psi | 90% | 3179 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 54,679 psi | 86% | 3110 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 92% | 56,478 psi | 89% | 3189 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 92% | 53,867 psi | 84% | 3186 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 86% | 56,666 psi | 89% | 3153 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,186 psi | 85% | 3031 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% | 47,007 psi | 74% | 2884 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 45,339 psi | 71% | 2943 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 80% | 49,110 psi | 77% | 3035 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 80% | 51,068 psi | 80% | 3022 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 46,369 psi | 73% | 2969 fps | 99% |
| ADI AR 2217 | <<locked>> | 80% | 34,563 psi | 54% | 2694 fps | 96.1% |
| ADI AR 2218 | 108.2 gr | 90% | 42,395 psi | 66% | 2966 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 31,937 psi | 50% | 2667 fps | 98.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,865 psi | 80% | 3015 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,123 psi | 74% | 2972 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,818 psi | 72% | 2894 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,030 psi | 63% | 2841 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 52,649 psi | 83% | 3084 fps | 100% |
| Alliant Reloder-33 | 107.7 gr | 88% | 43,729 psi | 69% | 2959 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 92% | 43,859 psi | 69% | 2949 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,164 psi | 69% | 2871 fps | 96.1% |
| Bofors RP15 | <<locked>> | 80% | 43,845 psi | 69% | 2904 fps | 99.2% |
| Bofors RP30 | <<locked>> | 80% | 37,405 psi | 59% | 2779 fps | 97.2% |
| Bofors RP5 | <<locked>> | 80% | 47,123 psi | 74% | 2972 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 80% | 37,652 psi | 59% | 2776 fps | 97.8% |
| Hodgdon H4831 | <<locked>> | 80% | 48,805 psi | 76% | 2966 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,950 psi | 75% | 2946 fps | 98.8% |
| Hodgdon Retumbo | <<locked>> | 80% | 39,146 psi | 61% | 2900 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,456 psi | 45% | 1798 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,342 psi | 77% | 2949 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 80% | 45,150 psi | 71% | 2953 fps | 98.8% |
| IMR 8133 Enduron | <<locked>> | 84% | 33,866 psi | 53% | 2700 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 40,524 psi | 64% | 2756 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 29,762 psi | 47% | 2602 fps | 96% |
| Norma MRP | <<locked>> | 80% | 50,256 psi | 79% | 3048 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 45,643 psi | 72% | 2969 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 80% | 41,205 psi | 65% | 2835 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,254 psi | 46% | 1841 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,667 psi | 61% | 2874 fps | 99.7% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 38,392 psi | 60% | 2825 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 51,503 psi | 81% | 2992 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 80% | 50,604 psi | 79% | 3005 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 47,456 psi | 74% | 2959 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,256 psi | 79% | 2999 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 52,707 psi | 83% | 2982 fps | 99.4% |
| Somchem S385 | <<locked>> | 80% | 50,981 psi | 80% | 2976 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,686 psi | 70% | 2848 fps | 99.6% |
| Vihtavuori N170 | <<locked>> | 86% | 47,007 psi | 74% | 2913 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 50,575 psi | 79% | 2976 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,734 psi | 78% | 3045 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 80% | 41,539 psi | 65% | 2854 fps | 97.7% |
| Vihtavuori N568 | <<locked>> | 82% | 39,465 psi | 62% | 2844 fps | 95.7% |
| Vihtavuori N570 | 101.3 gr | 86% | 43,439 psi | 68% | 2969 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,165 psi | 71% | 2969 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,065 psi | 74% | 2904 fps | 99.6% |
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 50 powders for .30-378 Weath. Mag. loaded with the .308 | 180gr | MAKER Expanding Subsonic. ADI AR 2218 delivers the highest muzzle velocity at 3,274 fps; across all powders the maximum-charge window runs from 2,008 fps to 3,274 fps. Accurate 8700 gives the best case fill at 100 %, and 50 of the 50 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 1:13.5 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, Alliant Reloder-33 rank at the top here: for .30-378 Weath. Mag. with the .308 | 180gr | MAKER Expanding Subsonic 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.