Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:183 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:1:10.5
Load data in caliber .30-378 Weath. Mag. with .308 | 183gr | Peregrine Plainsmaster (VLR-4) bullet and 105 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ADI AR 2218.
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>> | 86% | 55,274 psi | 87% | 3002 fps | 100% |
| Accurate 3100 | <<locked>> | 86% | 54,621 psi | 86% | 2992 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 46,688 psi | 73% | 2956 fps | 96.1% |
| Accurate High Country | <<locked>> | 84% | 56,753 psi | 89% | 3163 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 57,464 psi | 90% | 3176 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 53,838 psi | 84% | 3107 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 84% | 54,491 psi | 85% | 3117 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 84% | 56,695 psi | 89% | 3100 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 56,014 psi | 88% | 3087 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,288 psi | 87% | 3117 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 54,766 psi | 86% | 3107 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 96% | 57,595 psi | 90% | 3146 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 54,346 psi | 85% | 3097 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 53,940 psi | 85% | 3202 fps | 98.5% |
| ADI AR 2218 | <<locked>> | 98% | 54,752 psi | 86% | 3222 fps | 98.8% |
| ADI AR 2225 | <<locked>> | 98% | 57,464 psi | 90% | 3176 fps | 100% |
| ADI AR 2225 | <<locked>> | 98% | 56,637 psi | 89% | 3163 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 56,202 psi | 88% | 3084 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 56,855 psi | 89% | 3097 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,608 psi | 87% | 3077 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,260 psi | 88% | 3087 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,709 psi | 87% | 3107 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,187 psi | 86% | 3100 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,942 psi | 89% | 3054 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,682 psi | 90% | 3064 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,551 psi | 90% | 3136 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 54,549 psi | 85% | 3091 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 53,708 psi | 84% | 3087 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,433 psi | 85% | 3097 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 55,854 psi | 88% | 3179 fps | 98.6% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,608 psi | 89% | 3196 fps | 98.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,477 psi | 87% | 3166 fps | 98.1% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,362 psi | 88% | 3182 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,869 psi | 88% | 3077 fps | 98.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,390 psi | 87% | 3071 fps | 98.6% |
| Bofors RP15 | <<locked>> | 88% | 54,578 psi | 86% | 3087 fps | 100% |
| Bofors RP15 | <<locked>> | 88% | 55,245 psi | 87% | 3100 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 57,377 psi | 90% | 3159 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 54,186 psi | 85% | 3107 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 55,187 psi | 86% | 3100 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 55,709 psi | 87% | 3107 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 55,158 psi | 86% | 3107 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 55,811 psi | 87% | 3117 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 54,186 psi | 85% | 3045 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 86% | 57,479 psi | 90% | 3097 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,434 psi | 88% | 3081 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,898 psi | 89% | 3091 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,217 psi | 88% | 2989 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,797 psi | 89% | 2995 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 56,942 psi | 89% | 3232 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 53,882 psi | 84% | 3182 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,681 psi | 59% | 1978 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,724 psi | 59% | 1985 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 54,592 psi | 86% | 3025 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,595 psi | 90% | 3071 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 88% | 57,682 psi | 90% | 3163 fps | 100% |
| IMR 7828 SSC | <<locked>> | 88% | 57,014 psi | 89% | 3150 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 92% | 56,753 psi | 89% | 3028 fps | 95.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,333 psi | 88% | 3156 fps | 100% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,535 psi | 87% | 3146 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 56,521 psi | 89% | 3022 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 57,159 psi | 90% | 3031 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,667 psi | 90% | 3179 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,826 psi | 89% | 3166 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,100 psi | 86% | 3110 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,811 psi | 87% | 3123 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,042 psi | 86% | 3120 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,317 psi | 85% | 3110 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 90% | 56,913 psi | 89% | 3097 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 57,580 psi | 90% | 3107 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,754 psi | 61% | 2028 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,682 psi | 61% | 2031 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 53,693 psi | 84% | 3153 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 54,534 psi | 85% | 3166 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,116 psi | 90% | 3186 fps | 99.8% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 53,577 psi | 84% | 3127 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 84% | 56,420 psi | 88% | 3058 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 84% | 57,087 psi | 89% | 3068 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 84% | 55,317 psi | 87% | 3068 fps | 100% |
| Rottweil R 905 | <<locked>> | 84% | 56,014 psi | 88% | 3081 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 48,733 psi | 76% | 2969 fps | 96.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,955 psi | 86% | 3064 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,637 psi | 87% | 3074 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,143 psi | 85% | 2989 fps | 99.5% |
| Somchem S361 | <<locked>> | 82% | 54,694 psi | 86% | 2999 fps | 99.6% |
| Somchem S385 | <<locked>> | 84% | 55,535 psi | 87% | 3031 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 56,202 psi | 88% | 3045 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,709 psi | 87% | 3022 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,333 psi | 88% | 3031 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 54,940 psi | 86% | 3048 fps | 97% |
| Vihtavuori N170 | <<locked>> | 92% | 55,448 psi | 87% | 3058 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 84% | 55,579 psi | 87% | 3041 fps | 100% |
| Vihtavuori N555 | <<locked>> | 84% | 55,027 psi | 86% | 3031 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,259 psi | 87% | 3130 fps | 99.8% |
| Vihtavuori N560 | <<locked>> | 84% | 54,578 psi | 86% | 3117 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 90% | 55,651 psi | 87% | 3110 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 90% | 56,246 psi | 88% | 3123 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 94% | 57,508 psi | 90% | 3186 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 92% | 54,244 psi | 85% | 3133 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 94% | 54,926 psi | 86% | 3189 fps | 98.1% |
| Vihtavuori N570 | <<locked>> | 94% | 55,724 psi | 87% | 3202 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 54,288 psi | 85% | 3100 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,725 psi | 90% | 3153 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,202 psi | 88% | 3045 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,579 psi | 87% | 3035 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% | 45,005 psi | 71% | 2831 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 44,498 psi | 70% | 2822 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 43,323 psi | 68% | 2887 fps | 95% |
| Accurate High Country | <<locked>> | 80% | 49,327 psi | 77% | 3031 fps | 99.4% |
| Accurate High Country | <<locked>> | 80% | 49,864 psi | 78% | 3041 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 80% | 46,659 psi | 73% | 2969 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 80% | 47,137 psi | 74% | 2979 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 80% | 49,487 psi | 78% | 2979 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 80% | 48,965 psi | 77% | 2969 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 44,643 psi | 70% | 2920 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 80% | 44,135 psi | 69% | 2910 fps | 98.6% |
| ADI AR 2217 | <<locked>> | 80% | 32,648 psi | 51% | 2628 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 80% | 33,069 psi | 52% | 2641 fps | 95.5% |
| ADI AR 2218 | 108.3 gr | 92% | 43,149 psi | 68% | 2969 fps | 95.4% |
| ADI AR 2218 | 108.3 gr | 92% | 43,743 psi | 69% | 2986 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 30,371 psi | 48% | 2605 fps | 97.4% |
| ADI AR 2225 | <<locked>> | 80% | 29,892 psi | 47% | 2589 fps | 97.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,284 psi | 77% | 2966 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,792 psi | 78% | 2976 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,820 psi | 77% | 2959 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,327 psi | 77% | 2969 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,310 psi | 71% | 2920 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,788 psi | 70% | 2910 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,584 psi | 68% | 2841 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,135 psi | 69% | 2851 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,782 psi | 59% | 2779 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,276 psi | 60% | 2789 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,690 psi | 78% | 3022 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,401 psi | 79% | 3031 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 44,396 psi | 70% | 2963 fps | 95.9% |
| Alliant Reloder-33 | <<locked>> | 88% | 41,727 psi | 65% | 2900 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 94% | 44,019 psi | 69% | 2943 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 94% | 44,701 psi | 70% | 2956 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 42,859 psi | 67% | 2828 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 42,409 psi | 66% | 2815 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 41,640 psi | 65% | 2841 fps | 98.8% |
| Bofors RP15 | <<locked>> | 80% | 42,148 psi | 66% | 2854 fps | 98.9% |
| Bofors RP30 | <<locked>> | 80% | 35,128 psi | 55% | 2707 fps | 96.4% |
| Bofors RP30 | <<locked>> | 80% | 35,607 psi | 56% | 2720 fps | 96.6% |
| Bofors RP5 | <<locked>> | 80% | 44,788 psi | 70% | 2910 fps | 99.4% |
| Bofors RP5 | <<locked>> | 80% | 45,310 psi | 71% | 2920 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 80% | 35,592 psi | 56% | 2713 fps | 97.2% |
| Hodgdon H1000 | <<locked>> | 80% | 36,013 psi | 56% | 2723 fps | 97.4% |
| Hodgdon H4831 | <<locked>> | 80% | 47,166 psi | 74% | 2917 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 80% | 46,673 psi | 73% | 2907 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,803 psi | 72% | 2890 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,282 psi | 73% | 2900 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,678 psi | 83% | 2933 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,258 psi | 83% | 2943 fps | 100% |
| Hodgdon Retumbo | 88.9 gr | 80% | 36,811 psi | 58% | 2828 fps | 98.7% |
| Hodgdon Retumbo | 88.9 gr | 80% | 37,434 psi | 59% | 2841 fps | 98.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,326 psi | 44% | 1775 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,355 psi | 44% | 1778 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,964 psi | 75% | 2904 fps | 98.9% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,500 psi | 74% | 2894 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 80% | 43,497 psi | 68% | 2904 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 80% | 42,975 psi | 67% | 2890 fps | 98.4% |
| IMR 7977 Enduron | <<locked>> | 90% | 53,127 psi | 83% | 2966 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 86% | 34,432 psi | 54% | 2707 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 86% | 33,968 psi | 53% | 2697 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 38,159 psi | 60% | 2690 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 38,667 psi | 61% | 2703 fps | 99.7% |
| Norma 217 | <<locked>> | 80% | 27,934 psi | 44% | 2533 fps | 95.1% |
| Norma 217 | <<locked>> | 82% | 29,646 psi | 46% | 2592 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 47,819 psi | 75% | 2986 fps | 100% |
| Norma MRP | <<locked>> | 80% | 48,370 psi | 76% | 2995 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 43,714 psi | 69% | 2913 fps | 98.9% |
| Ramshot Grand | <<locked>> | 80% | 43,178 psi | 68% | 2904 fps | 98.7% |
| Ramshot Magnum | <<locked>> | 80% | 38,725 psi | 61% | 2769 fps | 99% |
| Ramshot Magnum | <<locked>> | 80% | 39,349 psi | 62% | 2779 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,979 psi | 45% | 1814 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,124 psi | 46% | 1821 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,158 psi | 57% | 2799 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,738 psi | 58% | 2812 fps | 99.4% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 38,667 psi | 61% | 2822 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 36,390 psi | 57% | 2766 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 49,530 psi | 78% | 2940 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 80% | 49,995 psi | 78% | 2946 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 80% | 48,385 psi | 76% | 2946 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 48,921 psi | 77% | 2959 fps | 99.8% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 45,339 psi | 71% | 2904 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,037 psi | 75% | 2943 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,573 psi | 76% | 2953 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 50,618 psi | 79% | 2927 fps | 99.2% |
| Somchem S361 | <<locked>> | 80% | 51,039 psi | 80% | 2936 fps | 99.3% |
| Somchem S385 | <<locked>> | 80% | 48,646 psi | 76% | 2917 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 49,124 psi | 77% | 2927 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 42,612 psi | 67% | 2792 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 80% | 43,091 psi | 68% | 2802 fps | 99.5% |
| Vihtavuori N170 | <<locked>> | 88% | 47,805 psi | 75% | 2917 fps | 95.2% |
| Vihtavuori N170 | <<locked>> | 88% | 48,312 psi | 76% | 2927 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 48,602 psi | 76% | 2927 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 48,182 psi | 76% | 2920 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,964 psi | 75% | 2995 fps | 98.9% |
| Vihtavuori N560 | <<locked>> | 80% | 47,442 psi | 74% | 2986 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 80% | 39,262 psi | 62% | 2789 fps | 97.1% |
| Vihtavuori N565 | <<locked>> | 80% | 39,755 psi | 62% | 2799 fps | 97.3% |
| Vihtavuori N568 | <<locked>> | 84% | 39,842 psi | 62% | 2841 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 82% | 37,536 psi | 59% | 2785 fps | 95.1% |
| Vihtavuori N570 | 101.4 gr | 88% | 43,947 psi | 69% | 2969 fps | 95.3% |
| Vihtavuori N570 | 101.4 gr | 88% | 44,527 psi | 70% | 2982 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,076 psi | 68% | 2917 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,264 psi | 66% | 2904 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,498 psi | 71% | 2858 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,049 psi | 71% | 2851 fps | 99.4% |
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 105 powders for .30-378 Weath. Mag. loaded with the .308 | 183gr | Peregrine Plainsmaster (VLR-4). Hodgdon Retumbo delivers the highest muzzle velocity at 3,232 fps; across all powders the maximum-charge window runs from 1,978 fps to 3,232 fps. Accurate 8700 gives the best case fill at 100 %, and 105 of the 105 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 183.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Alliant Reloder-50, Alliant Reloder-50 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. Vihtavuori N570, Hodgdon Retumbo, ADI AR 2218 rank at the top here: for .30-378 Weath. Mag. with the .308 | 183gr | Peregrine Plainsmaster (VLR-4) 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.