Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 170gr | Winchester FN Silv.Tip 30-30 bullet and 51 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>> | 86% | 57,450 psi | 90% | 3127 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,037 psi | 77% | 3077 fps | 96.2% |
| Accurate High Country | <<locked>> | 82% | 55,593 psi | 87% | 3235 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 84% | 56,463 psi | 88% | 3238 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 82% | 54,563 psi | 86% | 3159 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 57,159 psi | 90% | 3238 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 56,463 psi | 88% | 3219 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 57,101 psi | 89% | 3346 fps | 98.8% |
| ADI AR 2225 | <<locked>> | 96% | 55,869 psi | 88% | 3238 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,244 psi | 85% | 3146 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 57,667 psi | 90% | 3232 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,854 psi | 88% | 3130 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 56,550 psi | 89% | 3212 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 56,652 psi | 89% | 3219 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 54,998 psi | 86% | 3245 fps | 98.1% |
| Alliant Reloder-50 | <<locked>> | 98% | 55,100 psi | 86% | 3235 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 57,363 psi | 90% | 3192 fps | 98.6% |
| Bofors RP15 | <<locked>> | 88% | 57,014 psi | 89% | 3219 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 56,391 psi | 88% | 3232 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 57,667 psi | 90% | 3232 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 53,853 psi | 84% | 3173 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 55,753 psi | 87% | 3163 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 84% | 54,824 psi | 86% | 3146 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,898 psi | 88% | 3304 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,898 psi | 59% | 2073 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,999 psi | 88% | 3140 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 86% | 55,608 psi | 87% | 3219 fps | 99.8% |
| IMR 8133 Enduron | <<locked>> | 98% | 54,810 psi | 86% | 3215 fps | 99.9% |
| Lovex S071 | <<locked>> | 90% | 55,680 psi | 87% | 3100 fps | 100% |
| Norma 217 | <<locked>> | 98% | 56,289 psi | 88% | 3241 fps | 100% |
| Norma MRP | <<locked>> | 82% | 53,998 psi | 85% | 3186 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 57,145 psi | 90% | 3245 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 55,535 psi | 87% | 3166 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,957 psi | 61% | 2123 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 57,029 psi | 89% | 3291 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 56,289 psi | 88% | 3255 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 82% | 54,853 psi | 86% | 3127 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 82% | 54,070 psi | 85% | 3140 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 50,952 psi | 80% | 3091 fps | 96.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 57,377 psi | 90% | 3199 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,362 psi | 88% | 3117 fps | 99.6% |
| Somchem S385 | <<locked>> | 82% | 54,288 psi | 85% | 3107 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,491 psi | 85% | 3094 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 57,609 psi | 90% | 3179 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 84% | 57,537 psi | 90% | 3163 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 57,116 psi | 90% | 3251 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 88% | 54,650 psi | 86% | 3179 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 92% | 56,579 psi | 89% | 3258 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 92% | 54,041 psi | 85% | 3255 fps | 97.5% |
| Winchester StaBALL HD | <<locked>> | 86% | 56,782 psi | 89% | 3228 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,114 psi | 85% | 3100 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 46,862 psi | 73% | 2953 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 45,411 psi | 71% | 3002 fps | 95.1% |
| Accurate High Country | <<locked>> | 80% | 51,721 psi | 81% | 3163 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 80% | 49,110 psi | 77% | 3100 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 80% | 50,923 psi | 80% | 3094 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 46,296 psi | 73% | 3038 fps | 98.6% |
| ADI AR 2217 | <<locked>> | 80% | 34,476 psi | 54% | 2749 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 92% | 45,614 psi | 71% | 3104 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 31,894 psi | 50% | 2717 fps | 97.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,705 psi | 79% | 3084 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,065 psi | 74% | 3038 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,745 psi | 72% | 2966 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,900 psi | 63% | 2907 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 52,605 psi | 82% | 3156 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 43,888 psi | 69% | 3022 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 94% | 47,369 psi | 74% | 3087 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,048 psi | 69% | 2933 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 43,729 psi | 69% | 2969 fps | 98.9% |
| Bofors RP30 | <<locked>> | 80% | 37,275 psi | 58% | 2835 fps | 96.6% |
| Bofors RP5 | <<locked>> | 80% | 47,065 psi | 74% | 3038 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 80% | 37,594 psi | 59% | 2838 fps | 97.4% |
| Hodgdon H4831 | <<locked>> | 80% | 48,718 psi | 76% | 3031 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,877 psi | 75% | 3015 fps | 98.5% |
| Hodgdon Retumbo | <<locked>> | 80% | 39,059 psi | 61% | 2963 fps | 98.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,471 psi | 45% | 1860 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,240 psi | 77% | 3015 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 80% | 45,121 psi | 71% | 3018 fps | 98.5% |
| IMR 8133 Enduron | <<locked>> | 84% | 33,866 psi | 53% | 2759 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 40,495 psi | 63% | 2822 fps | 99.7% |
| Norma 217 | <<locked>> | 80% | 29,660 psi | 46% | 2651 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 50,227 psi | 79% | 3117 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 45,600 psi | 71% | 3035 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 80% | 41,075 psi | 64% | 2897 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,240 psi | 46% | 1903 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,624 psi | 61% | 2933 fps | 99.5% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 38,319 psi | 60% | 2881 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 51,430 psi | 81% | 3061 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 80% | 50,488 psi | 79% | 3077 fps | 99.8% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 47,500 psi | 74% | 3022 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,140 psi | 79% | 3071 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 52,692 psi | 83% | 3054 fps | 99.2% |
| Somchem S385 | <<locked>> | 80% | 50,923 psi | 80% | 3048 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,556 psi | 70% | 2913 fps | 99.5% |
| Vihtavuori N170 | <<locked>> | 88% | 50,285 psi | 79% | 3045 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 50,502 psi | 79% | 3048 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,647 psi | 78% | 3114 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 80% | 41,553 psi | 65% | 2917 fps | 97.3% |
| Vihtavuori N568 | <<locked>> | 82% | 39,421 psi | 62% | 2904 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 88% | 46,673 psi | 73% | 3104 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,107 psi | 71% | 3038 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,123 psi | 74% | 2976 fps | 99.5% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 58 powders for .30-378 Weath. Mag. loaded with the .308 | 170gr | Winchester FN Silv.Tip 30-30. ADI AR 2218 delivers the highest muzzle velocity at 3,346 fps; across all powders the maximum-charge window runs from 2,073 fps to 3,346 fps. Accurate 8700 gives the best case fill at 100 %, and 58 of the 58 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 170.0 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. As outliers, Hodgdon US 869, IMR 7977 Enduron, Lovex D100 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.