Load Specifications
Bullet:.308 | 190gr | Speer Impact
Bullet Manufacturer:Speer
Bullet Weight:190 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Caliber:.30-378 Weath. Mag. load data
Case Length (l3):2.913"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:133 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:26"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:11.5
Load data in caliber .30-378 Weath. Mag. with .308 | 190gr | Speer Impact bullet and 107 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 84% | 54,215 psi | 85% | 2933 fps | 100% |
| Accurate 3100 | <<locked>> | 84% | 54,549 psi | 85% | 2940 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,414 psi | 77% | 2963 fps | 97.2% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,676 psi | 78% | 2966 fps | 97.3% |
| Accurate High Country | <<locked>> | 82% | 56,246 psi | 88% | 3097 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 56,405 psi | 88% | 3100 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 57,232 psi | 90% | 3110 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 84% | 57,377 psi | 90% | 3114 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 82% | 55,201 psi | 87% | 3022 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 55,361 psi | 87% | 3025 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 53,969 psi | 85% | 3041 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 84% | 54,114 psi | 85% | 3045 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 56,985 psi | 89% | 3084 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 57,305 psi | 90% | 3087 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 57,508 psi | 90% | 3222 fps | 99.4% |
| ADI AR 2218 | <<locked>> | 96% | 53,679 psi | 84% | 3150 fps | 98.8% |
| ADI AR 2225 | <<locked>> | 96% | 56,478 psi | 89% | 3107 fps | 100% |
| ADI AR 2225 | <<locked>> | 96% | 56,782 psi | 89% | 3110 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 55,434 psi | 87% | 3018 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 55,434 psi | 87% | 3018 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 55,593 psi | 87% | 3022 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,882 psi | 86% | 3012 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,042 psi | 86% | 3015 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,592 psi | 86% | 3035 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,737 psi | 86% | 3038 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,492 psi | 89% | 2992 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,666 psi | 89% | 2995 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,159 psi | 90% | 3074 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,348 psi | 90% | 3077 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 57,290 psi | 90% | 3084 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 57,464 psi | 90% | 3084 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,492 psi | 87% | 3127 fps | 98.8% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,796 psi | 87% | 3130 fps | 98.9% |
| Alliant Reloder-50 | <<locked>> | 98% | 55,506 psi | 87% | 3117 fps | 98.4% |
| Alliant Reloder-50 | <<locked>> | 98% | 55,796 psi | 87% | 3123 fps | 98.5% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,244 psi | 85% | 2999 fps | 98.7% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,375 psi | 85% | 3002 fps | 98.7% |
| Bofors RP15 | <<locked>> | 88% | 57,638 psi | 90% | 3084 fps | 100% |
| Bofors RP15 | <<locked>> | 86% | 54,143 psi | 85% | 3028 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 56,927 psi | 89% | 3097 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 57,261 psi | 90% | 3100 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,592 psi | 86% | 3035 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,737 psi | 86% | 3038 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,447 psi | 85% | 3041 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,781 psi | 86% | 3048 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,463 psi | 88% | 3031 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 84% | 56,652 psi | 89% | 3031 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,477 psi | 87% | 3015 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,608 psi | 87% | 3018 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 90% | 56,782 psi | 89% | 3173 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 56,971 psi | 89% | 3173 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,956 psi | 59% | 1949 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,913 psi | 59% | 1952 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,449 psi | 88% | 3002 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,739 psi | 89% | 3009 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 86% | 56,362 psi | 88% | 3084 fps | 100% |
| IMR 7828 SSC | <<locked>> | 86% | 56,565 psi | 89% | 3091 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 55,230 psi | 87% | 2953 fps | 95.9% |
| IMR 7977 Enduron | <<locked>> | 90% | 55,347 psi | 87% | 2959 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,419 psi | 87% | 3087 fps | 100% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,767 psi | 87% | 3097 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 56,391 psi | 88% | 2966 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 56,521 psi | 89% | 2966 fps | 100% |
| Norma 217 | <<locked>> | 98% | 56,898 psi | 89% | 3110 fps | 100% |
| Norma 217 | <<locked>> | 98% | 57,217 psi | 90% | 3117 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,636 psi | 86% | 3048 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,795 psi | 86% | 3051 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 57,725 psi | 90% | 3110 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 53,940 psi | 85% | 3048 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 56,202 psi | 88% | 3031 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 56,507 psi | 89% | 3038 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,957 psi | 61% | 1995 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,059 psi | 61% | 1998 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 57,711 psi | 90% | 3156 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 53,708 psi | 84% | 3097 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 56,724 psi | 89% | 3127 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 57,058 psi | 89% | 3130 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 82% | 55,535 psi | 87% | 2989 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 55,680 psi | 87% | 2995 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 54,694 psi | 86% | 3002 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 54,911 psi | 86% | 3009 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,416 psi | 81% | 2972 fps | 97.3% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,634 psi | 81% | 2976 fps | 97.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,331 psi | 85% | 3002 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,549 psi | 85% | 3002 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,739 psi | 89% | 2979 fps | 99.9% |
| Somchem S361 | <<locked>> | 82% | 57,043 psi | 89% | 2986 fps | 99.9% |
| Somchem S385 | <<locked>> | 82% | 54,882 psi | 86% | 2969 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 55,027 psi | 86% | 2972 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,940 psi | 86% | 2959 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,274 psi | 87% | 2963 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,215 psi | 85% | 2986 fps | 97.3% |
| Vihtavuori N170 | <<locked>> | 90% | 54,520 psi | 85% | 2992 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 82% | 54,621 psi | 86% | 2969 fps | 100% |
| Vihtavuori N555 | <<locked>> | 82% | 54,810 psi | 86% | 2972 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 53,983 psi | 85% | 3054 fps | 99.8% |
| Vihtavuori N560 | <<locked>> | 82% | 54,157 psi | 85% | 3058 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 55,317 psi | 87% | 3051 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 55,477 psi | 87% | 3054 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 92% | 57,145 psi | 90% | 3130 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 92% | 57,261 psi | 90% | 3133 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 92% | 54,534 psi | 85% | 3130 fps | 98.4% |
| Vihtavuori N570 | <<locked>> | 92% | 54,882 psi | 86% | 3136 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 86% | 57,421 psi | 90% | 3087 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 84% | 53,635 psi | 84% | 3035 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,737 psi | 86% | 2969 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,868 psi | 86% | 2972 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% | 47,558 psi | 75% | 2825 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 47,718 psi | 75% | 2828 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 42,627 psi | 67% | 2828 fps | 95.2% |
| Accurate 8700 | <<locked>> | 96% | 42,830 psi | 67% | 2831 fps | 95.3% |
| Accurate High Country | <<locked>> | 80% | 52,446 psi | 82% | 3035 fps | 99.8% |
| Accurate High Country | <<locked>> | 80% | 52,605 psi | 82% | 3038 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 49,661 psi | 78% | 2976 fps | 99% |
| Accurate MAGPRO | <<locked>> | 80% | 49,821 psi | 78% | 2979 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 80% | 51,619 psi | 81% | 2963 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 51,808 psi | 81% | 2966 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 46,847 psi | 73% | 2910 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 47,021 psi | 74% | 2917 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 80% | 34,998 psi | 55% | 2648 fps | 96.8% |
| ADI AR 2217 | <<locked>> | 80% | 35,143 psi | 55% | 2654 fps | 96.9% |
| ADI AR 2218 | 105.7 gr | 90% | 42,888 psi | 67% | 2920 fps | 95.9% |
| ADI AR 2218 | 105.7 gr | 90% | 43,105 psi | 68% | 2927 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 32,300 psi | 51% | 2621 fps | 98.6% |
| ADI AR 2225 | <<locked>> | 80% | 32,445 psi | 51% | 2625 fps | 98.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 51,909 psi | 81% | 2963 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 51,909 psi | 81% | 2963 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 52,069 psi | 82% | 2963 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,416 psi | 81% | 2953 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,605 psi | 81% | 2956 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,616 psi | 75% | 2913 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,776 psi | 75% | 2920 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,311 psi | 73% | 2835 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,499 psi | 73% | 2838 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,567 psi | 64% | 2789 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,785 psi | 64% | 2795 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 53,142 psi | 83% | 3022 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 53,476 psi | 84% | 3028 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 41,176 psi | 65% | 2841 fps | 95.2% |
| Alliant Reloder-33 | <<locked>> | 86% | 41,321 psi | 65% | 2844 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 92% | 44,440 psi | 70% | 2907 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 92% | 44,730 psi | 70% | 2910 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,527 psi | 70% | 2815 fps | 96.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,817 psi | 70% | 2822 fps | 96.8% |
| Bofors RP15 | <<locked>> | 80% | 44,367 psi | 70% | 2848 fps | 99.5% |
| Bofors RP15 | <<locked>> | 80% | 44,527 psi | 70% | 2851 fps | 99.5% |
| Bofors RP30 | <<locked>> | 80% | 37,956 psi | 59% | 2730 fps | 97.8% |
| Bofors RP30 | <<locked>> | 80% | 38,101 psi | 60% | 2736 fps | 97.9% |
| Bofors RP5 | <<locked>> | 80% | 47,616 psi | 75% | 2913 fps | 99.9% |
| Bofors RP5 | <<locked>> | 80% | 47,776 psi | 75% | 2920 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 38,101 psi | 60% | 2726 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 80% | 38,232 psi | 60% | 2733 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 80% | 49,269 psi | 77% | 2907 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 80% | 49,414 psi | 77% | 2910 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,399 psi | 76% | 2890 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,544 psi | 76% | 2894 fps | 99.2% |
| Hodgdon Retumbo | 88.6 gr | 80% | 39,610 psi | 62% | 2848 fps | 99.5% |
| Hodgdon Retumbo | 88.6 gr | 80% | 39,769 psi | 62% | 2854 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,514 psi | 45% | 1745 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,529 psi | 45% | 1749 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,835 psi | 78% | 2887 fps | 99.4% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,980 psi | 78% | 2894 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 80% | 45,614 psi | 71% | 2894 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 80% | 45,803 psi | 72% | 2900 fps | 99.2% |
| IMR 7977 Enduron | <<locked>> | 88% | 51,764 psi | 81% | 2894 fps | 95.1% |
| IMR 7977 Enduron | <<locked>> | 88% | 51,866 psi | 81% | 2897 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 82% | 32,082 psi | 50% | 2598 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 82% | 32,242 psi | 51% | 2602 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 41,046 psi | 64% | 2700 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 41,176 psi | 65% | 2707 fps | 100% |
| Norma 217 | <<locked>> | 80% | 30,226 psi | 47% | 2562 fps | 96.9% |
| Norma 217 | <<locked>> | 80% | 30,385 psi | 48% | 2566 fps | 97% |
| Norma MRP | <<locked>> | 80% | 50,894 psi | 80% | 2986 fps | 100% |
| Norma MRP | <<locked>> | 80% | 51,082 psi | 80% | 2992 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,267 psi | 73% | 2913 fps | 99.5% |
| Ramshot Grand | <<locked>> | 80% | 46,441 psi | 73% | 2917 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 80% | 41,684 psi | 65% | 2782 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 80% | 41,814 psi | 66% | 2785 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,356 psi | 46% | 1788 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,356 psi | 46% | 1788 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,088 psi | 61% | 2822 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,407 psi | 62% | 2831 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 36,042 psi | 56% | 2710 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 36,172 psi | 57% | 2713 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 51,996 psi | 81% | 2930 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 80% | 52,156 psi | 82% | 2936 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 51,169 psi | 80% | 2943 fps | 100% |
| Rottweil R 905 | <<locked>> | 80% | 51,343 psi | 80% | 2949 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 44,773 psi | 70% | 2848 fps | 95.5% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 44,991 psi | 71% | 2851 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,821 psi | 80% | 2940 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,995 psi | 80% | 2943 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 53,156 psi | 83% | 2923 fps | 99.6% |
| Somchem S361 | <<locked>> | 80% | 53,272 psi | 83% | 2927 fps | 99.7% |
| Somchem S385 | <<locked>> | 80% | 51,430 psi | 81% | 2913 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 51,576 psi | 81% | 2917 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,223 psi | 71% | 2792 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 45,368 psi | 71% | 2795 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 47,529 psi | 74% | 2864 fps | 95.6% |
| Vihtavuori N170 | <<locked>> | 86% | 47,645 psi | 75% | 2867 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 80% | 51,155 psi | 80% | 2917 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 51,343 psi | 80% | 2917 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,343 psi | 79% | 2989 fps | 99.5% |
| Vihtavuori N560 | <<locked>> | 80% | 50,517 psi | 79% | 2992 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 80% | 42,047 psi | 66% | 2802 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 80% | 42,337 psi | 66% | 2808 fps | 98.3% |
| Vihtavuori N568 | <<locked>> | 80% | 37,231 psi | 58% | 2730 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 80% | 37,362 psi | 59% | 2733 fps | 95.5% |
| Vihtavuori N570 | 98.9 gr | 86% | 44,048 psi | 69% | 2923 fps | 95.8% |
| Vihtavuori N570 | 98.9 gr | 86% | 44,179 psi | 69% | 2927 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,861 psi | 72% | 2910 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,079 psi | 72% | 2913 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,688 psi | 75% | 2851 fps | 99.8% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,819 psi | 75% | 2851 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 107 powders for .30-378 Weath. Mag. loaded with the .308 | 190gr | Speer Impact. ADI AR 2218 delivers the highest muzzle velocity at 3,222 fps; across all powders the maximum-charge window runs from 1,949 fps to 3,222 fps. Accurate 8700 gives the best case fill at 100 %, and 107 of the 107 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 190.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Accurate 8700, Hodgdon TrailBoss 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 | 190gr | Speer Impact 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.