Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Winchester Silvertip bullet and 49 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ADI AR 2218 and Vihtavuori N570.
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% | 55,854 psi | 88% | 3028 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 51,779 psi | 81% | 3064 fps | 97.5% |
| Accurate MAGPRO | <<locked>> | 82% | 55,114 psi | 86% | 3143 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 82% | 56,695 psi | 89% | 3120 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 55,564 psi | 87% | 3136 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 55,056 psi | 86% | 3120 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 55,680 psi | 87% | 3251 fps | 99% |
| ADI AR 2225 | <<locked>> | 94% | 54,955 psi | 86% | 3146 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,304 psi | 88% | 3107 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 56,144 psi | 88% | 3133 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 54,549 psi | 85% | 3035 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 55,390 psi | 87% | 3117 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 53,838 psi | 84% | 3156 fps | 98.3% |
| Alliant Reloder-50 | <<locked>> | 96% | 54,070 psi | 85% | 3150 fps | 98% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 55,840 psi | 88% | 3097 fps | 98.8% |
| Bofors RP15 | <<locked>> | 86% | 55,680 psi | 87% | 3127 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 55,288 psi | 87% | 3136 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 56,144 psi | 88% | 3133 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 56,478 psi | 89% | 3140 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 54,244 psi | 85% | 3068 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 84% | 56,956 psi | 89% | 3110 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 54,955 psi | 86% | 3209 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,029 psi | 60% | 2024 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 54,418 psi | 85% | 3045 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 84% | 54,302 psi | 85% | 3123 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 90% | 56,623 psi | 89% | 3051 fps | 96.1% |
| IMR 8133 Enduron | <<locked>> | 98% | 57,580 psi | 90% | 3189 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 54,447 psi | 85% | 3009 fps | 100% |
| Norma 217 | <<locked>> | 96% | 55,376 psi | 87% | 3153 fps | 100% |
| Norma MRP | <<locked>> | 82% | 56,405 psi | 88% | 3146 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 55,680 psi | 87% | 3146 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 54,157 psi | 85% | 3068 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,117 psi | 61% | 2070 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 55,767 psi | 87% | 3192 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 54,882 psi | 86% | 3159 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 56,811 psi | 89% | 3087 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 56,231 psi | 88% | 3100 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 53,505 psi | 84% | 3071 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 55,854 psi | 88% | 3097 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 56,362 psi | 88% | 3064 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 56,637 psi | 89% | 3054 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,144 psi | 88% | 3087 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 82% | 56,144 psi | 88% | 3061 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 55,666 psi | 87% | 3153 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 57,101 psi | 89% | 3150 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 55,245 psi | 87% | 3163 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 92% | 56,840 psi | 89% | 3235 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 84% | 55,448 psi | 87% | 3127 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,260 psi | 88% | 3064 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% | 48,849 psi | 77% | 2917 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 44,556 psi | 70% | 2923 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 80% | 51,329 psi | 80% | 3074 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 80% | 52,924 psi | 83% | 3058 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 48,341 psi | 76% | 3009 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 80% | 36,100 psi | 57% | 2733 fps | 96.9% |
| ADI AR 2218 | 112.3 gr | 90% | 44,498 psi | 70% | 3015 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 33,518 psi | 53% | 2707 fps | 98.7% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,663 psi | 83% | 3045 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,095 psi | 77% | 3009 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 47,776 psi | 75% | 2927 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 41,930 psi | 66% | 2877 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 42,873 psi | 67% | 2936 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 92% | 46,514 psi | 73% | 3002 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,745 psi | 72% | 2907 fps | 96.8% |
| Bofors RP15 | <<locked>> | 80% | 45,643 psi | 72% | 2940 fps | 99.5% |
| Bofors RP30 | <<locked>> | 80% | 39,175 psi | 61% | 2815 fps | 97.8% |
| Bofors RP5 | <<locked>> | 80% | 49,095 psi | 77% | 3009 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 39,407 psi | 62% | 2818 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 80% | 50,647 psi | 79% | 3002 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,792 psi | 78% | 2986 fps | 99.2% |
| Hodgdon Retumbo | 94.3 gr | 80% | 41,133 psi | 64% | 2943 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,587 psi | 45% | 1811 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,966 psi | 80% | 2982 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 80% | 47,210 psi | 74% | 2992 fps | 99.2% |
| IMR 7977 Enduron | <<locked>> | 88% | 53,113 psi | 83% | 2989 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 82% | 33,330 psi | 52% | 2680 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 42,250 psi | 66% | 2792 fps | 100% |
| Norma 217 | <<locked>> | 80% | 31,473 psi | 49% | 2644 fps | 97% |
| Norma MRP | <<locked>> | 80% | 52,504 psi | 82% | 3081 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 47,921 psi | 75% | 3012 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 80% | 43,163 psi | 68% | 2874 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,370 psi | 46% | 1857 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 40,814 psi | 64% | 2917 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 37,565 psi | 59% | 2799 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 53,287 psi | 84% | 3028 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 52,518 psi | 82% | 3041 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 46,572 psi | 73% | 2940 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,170 psi | 82% | 3035 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 52,895 psi | 83% | 3009 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 46,369 psi | 73% | 2881 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 49,023 psi | 77% | 2956 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 52,620 psi | 82% | 3009 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 51,837 psi | 81% | 3084 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 80% | 43,511 psi | 68% | 2894 fps | 98.3% |
| Vihtavuori N568 | <<locked>> | 80% | 38,537 psi | 60% | 2818 fps | 95.5% |
| Vihtavuori N570 | 105.2 gr | 86% | 45,818 psi | 72% | 3018 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 47,761 psi | 75% | 3005 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,037 psi | 77% | 2943 fps | 99.9% |
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 55 powders for .30-378 Weath. Mag. loaded with the .308 | 180gr | Winchester Silvertip. ADI AR 2218 delivers the highest muzzle velocity at 3,251 fps; across all powders the maximum-charge window runs from 2,024 fps to 3,251 fps. Accurate 8700 gives the best case fill at 100 %, and 55 of the 55 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 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, Hodgdon US 869 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. Hodgdon Retumbo, ADI AR 2218, Vihtavuori N570 rank at the top here: for .30-378 Weath. Mag. with the .308 | 180gr | Winchester Silvertip they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon US 869, Lovex D100, 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.