Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 178gr | Remington SP Extended-Range bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Winchester StaBALL HD and IMR 7828 SSC.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 96% | 57,508 psi | 90% | 2949 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 55,259 psi | 87% | 2930 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 56,130 psi | 88% | 3041 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 82% | 56,347 psi | 88% | 2890 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 55,985 psi | 88% | 2982 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 96% | 57,392 psi | 90% | 3041 fps | 98.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,051 psi | 75% | 2871 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,801 psi | 67% | 2825 fps | 98.6% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 56,144 psi | 88% | 2979 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,696 psi | 90% | 2913 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,985 psi | 88% | 2986 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 57,348 psi | 90% | 3002 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 55,448 psi | 87% | 2969 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 96% | 57,290 psi | 90% | 3038 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 96% | 54,853 psi | 86% | 2959 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 54,041 psi | 85% | 3012 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 55,071 psi | 86% | 3045 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 56,217 psi | 88% | 3018 fps | 99.2% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,154 psi | 79% | 2943 fps | 97.8% |
| Bofors RP5 | <<locked>> | 96% | 57,290 psi | 90% | 3038 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 57,653 psi | 90% | 2930 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,069 psi | 83% | 2966 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 86% | 56,942 psi | 89% | 2982 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 55,883 psi | 88% | 2936 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 94% | 57,392 psi | 90% | 2982 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 94% | 56,289 psi | 88% | 2963 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 56,391 psi | 88% | 2910 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,881 psi | 83% | 3074 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 86% | 57,566 psi | 90% | 3022 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,072 psi | 58% | 1847 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,724 psi | 87% | 2917 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,622 psi | 87% | 2900 fps | 99.7% |
| IMR 4831 | <<locked>> | 88% | 55,564 psi | 87% | 2923 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 54,911 psi | 86% | 2907 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 96% | 55,216 psi | 87% | 3018 fps | 98.3% |
| Lovex S065 | <<locked>> | 86% | 56,289 psi | 88% | 2900 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 54,476 psi | 85% | 2894 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,868 psi | 86% | 2907 fps | 100% |
| Norma 204 | <<locked>> | 88% | 56,608 psi | 89% | 2966 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 38,464 psi | 60% | 2746 fps | 96.6% |
| Norma MRP | <<locked>> | 94% | 57,217 psi | 90% | 3061 fps | 99.9% |
| Norma URP | <<locked>> | 88% | 57,348 psi | 90% | 2966 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,941 psi | 88% | 3041 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 56,014 psi | 88% | 2969 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 54,128 psi | 85% | 2972 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,782 psi | 59% | 1890 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,855 psi | 89% | 2989 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 55,230 psi | 87% | 2953 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 57,363 psi | 90% | 3038 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 53,679 psi | 84% | 3077 fps | 100% |
| Rottweil R 903 | <<locked>> | 82% | 55,492 psi | 87% | 2881 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 57,246 psi | 90% | 2953 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 92% | 54,940 psi | 86% | 2959 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 86% | 57,653 psi | 90% | 2930 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,289 psi | 88% | 2900 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 54,476 psi | 85% | 2894 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 56,840 psi | 89% | 2936 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,288 psi | 87% | 2753 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,434 psi | 87% | 2851 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 54,534 psi | 85% | 2956 fps | 99% |
| Somchem S355 | <<locked>> | 82% | 55,085 psi | 86% | 2871 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,158 psi | 86% | 2887 fps | 97.5% |
| Somchem S365 | <<locked>> | 90% | 57,725 psi | 90% | 2969 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 55,579 psi | 87% | 2933 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 84% | 56,405 psi | 88% | 2848 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,521 psi | 87% | 2907 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 54,926 psi | 86% | 2910 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 86% | 54,752 psi | 86% | 2910 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 57,203 psi | 90% | 2989 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 57,072 psi | 89% | 3054 fps | 98.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 56,840 psi | 89% | 3031 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,984 psi | 86% | 2864 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 57,159 psi | 90% | 2986 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 98% | 56,217 psi | 88% | 3094 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 55,521 psi | 87% | 2927 fps | 99% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 33,504 psi | 53% | 2493 fps | 96.2% |
| Accurate 4350 | <<locked>> | 80% | 44,933 psi | 70% | 2756 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 90% | 48,791 psi | 76% | 2910 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 52,910 psi | 83% | 2838 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 40,205 psi | 63% | 2684 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 88% | 43,816 psi | 69% | 2789 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 96% | 42,206 psi | 66% | 2749 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 94% | 35,331 psi | 55% | 2638 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 40,611 psi | 64% | 2684 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 54,172 psi | 85% | 2861 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,018 psi | 67% | 2762 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,792 psi | 78% | 2887 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 40,219 psi | 63% | 2677 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 84% | 38,232 psi | 60% | 2671 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,111 psi | 50% | 2520 fps | 99% |
| Alliant Reloder-25 | <<locked>> | 82% | 29,994 psi | 47% | 2480 fps | 95.1% |
| Alliant Reloder-26 | 73.7 gr | 80% | 35,056 psi | 55% | 2654 fps | 98.2% |
| Bofors RP15 | <<locked>> | 88% | 40,654 psi | 64% | 2723 fps | 95.8% |
| Bofors RP30 | <<locked>> | 94% | 40,727 psi | 64% | 2759 fps | 95.2% |
| Bofors RP5 | <<locked>> | 84% | 38,232 psi | 60% | 2671 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 47,863 psi | 75% | 2766 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 92% | 40,379 psi | 63% | 2710 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 46,615 psi | 73% | 2805 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 80% | 49,269 psi | 77% | 2822 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 88% | 46,876 psi | 73% | 2799 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 45,977 psi | 72% | 2782 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,683 psi | 64% | 2648 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 37,942 psi | 59% | 2743 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 46,151 psi | 72% | 2828 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,731 psi | 43% | 1650 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,352 psi | 68% | 2690 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,110 psi | 77% | 2789 fps | 99.1% |
| IMR 4831 | <<locked>> | 80% | 42,859 psi | 67% | 2703 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 45,527 psi | 71% | 2736 fps | 95.5% |
| IMR 7828 SSC | 77.4 gr | 90% | 44,976 psi | 70% | 2825 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 46,659 psi | 73% | 2740 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 45,078 psi | 71% | 2726 fps | 98.7% |
| Lovex S071 | <<locked>> | 82% | 30,777 psi | 48% | 2421 fps | 95% |
| Norma 204 | <<locked>> | 80% | 43,265 psi | 68% | 2726 fps | 96.5% |
| Norma 217 | <<locked>> | 98% | 35,984 psi | 56% | 2684 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 34,853 psi | 55% | 2618 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 44,208 psi | 69% | 2743 fps | 99.7% |
| Ramshot Grand | <<locked>> | 88% | 41,872 psi | 66% | 2772 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 43,062 psi | 67% | 2740 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 88% | 37,434 psi | 59% | 2648 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,268 psi | 44% | 1690 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,866 psi | 83% | 2933 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,860 psi | 70% | 2776 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,105 psi | 68% | 2792 fps | 99.6% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 34,780 psi | 55% | 2654 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 52,011 psi | 82% | 2828 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 44,237 psi | 69% | 2720 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 82% | 39,392 psi | 62% | 2661 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 47,863 psi | 75% | 2766 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,659 psi | 73% | 2740 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 45,078 psi | 71% | 2726 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,359 psi | 84% | 2884 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,069 psi | 82% | 2707 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,759 psi | 72% | 2684 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 39,073 psi | 61% | 2657 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 51,706 psi | 81% | 2822 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 45,324 psi | 71% | 2713 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 41,147 psi | 64% | 2703 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,478 psi | 59% | 2589 fps | 95.9% |
| Vihtavuori N150 | <<locked>> | 80% | 49,588 psi | 78% | 2746 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,527 psi | 71% | 2740 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 37,086 psi | 58% | 2572 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 44,933 psi | 70% | 2743 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 36,100 psi | 57% | 2602 fps | 98.9% |
| Vihtavuori N560 | <<locked>> | 88% | 46,456 psi | 73% | 2861 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 92% | 43,352 psi | 68% | 2785 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,744 psi | 70% | 2707 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,760 psi | 73% | 2808 fps | 98.8% |
| Winchester StaBALL HD | 70.8 gr | 80% | 28,572 psi | 45% | 2523 fps | 98.9% |
| Winchester Supreme 780 | <<locked>> | 84% | 39,218 psi | 61% | 2625 fps | 95.4% |
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 75 powders for .300 Weath. Mag. loaded with the .308 | 178gr | Remington SP Extended-Range. Winchester StaBALL HD delivers the highest muzzle velocity at 3,094 fps; across all powders the maximum-charge window runs from 1,847 fps to 3,094 fps. ADI AR 2217 gives the best case fill at 100 %, and 75 of the 75 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 178.0 gr projectile in 0.308" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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. Alliant Reloder-26, Winchester StaBALL HD, IMR 7828 SSC rank at the top here: for .300 Weath. Mag. with the .308 | 178gr | Remington SP Extended-Range 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.