Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 190gr | Sierra MatchKing bullet and 86 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and Alliant Reloder-26.
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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 82% | 55,811 psi | 89% | 2726 fps | 99.3% |
| Accurate 3100 | <<locked>> | 98% | 54,549 psi | 87% | 2782 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 55,434 psi | 89% | 2707 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 52,721 psi | 85% | 2769 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 55,796 psi | 89% | 2923 fps | 98.3% |
| Accurate MAGPRO | <<locked>> | 96% | 52,924 psi | 85% | 2864 fps | 96.5% |
| ADI AR 2208 | <<locked>> | 84% | 55,143 psi | 88% | 2740 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 53,679 psi | 86% | 2818 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 98% | 54,955 psi | 88% | 2871 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,753 psi | 61% | 2592 fps | 96.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 53,954 psi | 87% | 2815 fps | 98.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 53,954 psi | 87% | 2815 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,130 psi | 90% | 2762 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,173 psi | 90% | 2782 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 53,650 psi | 86% | 2825 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 54,810 psi | 88% | 2844 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 53,243 psi | 85% | 2805 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,317 psi | 87% | 2867 fps | 98.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,056 psi | 88% | 2844 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,630 psi | 76% | 2789 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,187 psi | 88% | 2930 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,258 psi | 85% | 2848 fps | 98.6% |
| Bofors RP3 | <<locked>> | 82% | 53,505 psi | 86% | 2730 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 43,540 psi | 70% | 2710 fps | 96% |
| Bofors RP5 | <<locked>> | 98% | 54,317 psi | 87% | 2867 fps | 98.9% |
| Bofors RP7 | <<locked>> | 88% | 56,333 psi | 90% | 2772 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,181 psi | 76% | 2726 fps | 97% |
| Hodgdon H380 | <<locked>> | 82% | 53,824 psi | 86% | 2746 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 54,723 psi | 88% | 2818 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 86% | 54,462 psi | 87% | 2782 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 96% | 54,911 psi | 88% | 2808 fps | 97.2% |
| Hodgdon H4831 SC | <<locked>> | 96% | 53,925 psi | 86% | 2795 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 53,998 psi | 87% | 2749 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,456 psi | 74% | 2825 fps | 98.3% |
| Hodgdon Superformance | <<locked>> | 88% | 55,013 psi | 88% | 2858 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,666 psi | 59% | 1719 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 54,650 psi | 88% | 2723 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 54,041 psi | 87% | 2756 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,302 psi | 87% | 2743 fps | 99.5% |
| IMR 4831 | <<locked>> | 90% | 53,345 psi | 86% | 2762 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,347 psi | 90% | 2799 fps | 97.6% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,159 psi | 90% | 2904 fps | 98.2% |
| Lovex S062 | <<locked>> | 82% | 54,940 psi | 88% | 2717 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 54,578 psi | 88% | 2743 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,028 psi | 90% | 2785 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,617 psi | 78% | 2690 fps | 99.5% |
| Norma 203B | <<locked>> | 82% | 55,463 psi | 89% | 2766 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,723 psi | 88% | 2808 fps | 98.6% |
| Norma MRP | <<locked>> | 96% | 53,882 psi | 86% | 2890 fps | 99.6% |
| Norma URP | <<locked>> | 90% | 55,056 psi | 88% | 2805 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 52,837 psi | 85% | 2858 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 90% | 53,896 psi | 86% | 2812 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,749 psi | 81% | 2795 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,449 psi | 60% | 1762 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 53,621 psi | 86% | 2733 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,099 psi | 87% | 2831 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,434 psi | 90% | 2844 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,621 psi | 88% | 2871 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,572 psi | 75% | 2822 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 84% | 53,606 psi | 86% | 2726 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,274 psi | 89% | 2789 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 96% | 56,057 psi | 90% | 2848 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 88% | 56,333 psi | 90% | 2772 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,578 psi | 88% | 2743 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 54,940 psi | 88% | 2717 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,028 psi | 90% | 2785 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,085 psi | 88% | 2782 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,433 psi | 87% | 2612 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,172 psi | 87% | 2697 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,579 psi | 89% | 2841 fps | 99% |
| Somchem S355 | <<locked>> | 84% | 53,693 psi | 86% | 2723 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 53,316 psi | 85% | 2726 fps | 96.8% |
| Somchem S365 | <<locked>> | 92% | 54,679 psi | 88% | 2808 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 53,069 psi | 85% | 2769 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 86% | 54,795 psi | 88% | 2697 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 53,374 psi | 86% | 2746 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,043 psi | 90% | 2802 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 82% | 55,666 psi | 89% | 2697 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,246 psi | 90% | 2805 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 53,809 psi | 86% | 2818 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 54,056 psi | 87% | 2881 fps | 97.4% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,487 psi | 79% | 2789 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 52,968 psi | 85% | 2717 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 54,969 psi | 88% | 2822 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,705 psi | 81% | 2913 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 52,866 psi | 85% | 2759 fps | 98.5% |
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 2700 | <<locked>> | 80% | 52,127 psi | 84% | 2671 fps | 98.9% |
| Accurate 3100 | <<locked>> | 82% | 31,705 psi | 51% | 2349 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 52,127 psi | 84% | 2661 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,263 psi | 65% | 2552 fps | 99.3% |
| Accurate High Country | <<locked>> | 88% | 42,293 psi | 68% | 2680 fps | 95.1% |
| Accurate MAGPRO | <<locked>> | 94% | 49,255 psi | 79% | 2799 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 48,863 psi | 78% | 2641 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 41,249 psi | 66% | 2589 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 92% | 44,889 psi | 72% | 2687 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 98% | 35,563 psi | 57% | 2536 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 38,885 psi | 62% | 2533 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 38,885 psi | 62% | 2533 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,530 psi | 79% | 2664 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,910 psi | 85% | 2733 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,957 psi | 62% | 2562 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,425 psi | 71% | 2680 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 38,508 psi | 62% | 2526 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 88% | 38,928 psi | 62% | 2582 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,660 psi | 46% | 2329 fps | 97.9% |
| Alliant Reloder-25 | <<locked>> | 86% | 30,400 psi | 49% | 2392 fps | 95.3% |
| Alliant Reloder-26 | 63.1 gr | 80% | 30,734 psi | 49% | 2441 fps | 96.5% |
| Bofors RP15 | <<locked>> | 92% | 40,901 psi | 66% | 2621 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 50,096 psi | 80% | 2677 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 40,683 psi | 65% | 2651 fps | 95% |
| Bofors RP5 | <<locked>> | 88% | 38,928 psi | 62% | 2582 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 43,845 psi | 70% | 2562 fps | 97.6% |
| Hodgdon H1000 | <<locked>> | 96% | 41,176 psi | 66% | 2608 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 50,415 psi | 81% | 2694 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,003 psi | 67% | 2595 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 80% | 44,831 psi | 72% | 2615 fps | 97.2% |
| Hodgdon H4831 | <<locked>> | 92% | 48,167 psi | 77% | 2697 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 47,108 psi | 76% | 2680 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,535 psi | 59% | 2454 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 94% | 38,334 psi | 61% | 2638 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 41,031 psi | 66% | 2612 fps | 97.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,499 psi | 44% | 1539 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,430 psi | 82% | 2674 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 39,465 psi | 63% | 2493 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,237 psi | 73% | 2589 fps | 98.3% |
| IMR 4831 | <<locked>> | 80% | 38,537 psi | 62% | 2503 fps | 99.1% |
| IMR 4955 Enduron | <<locked>> | 90% | 46,920 psi | 75% | 2641 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 94% | 45,992 psi | 74% | 2723 fps | 95.9% |
| Lovex S062 | <<locked>> | 80% | 51,677 psi | 83% | 2667 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,786 psi | 69% | 2539 fps | 98.9% |
| Lovex S070 | <<locked>> | 80% | 40,988 psi | 66% | 2526 fps | 97.7% |
| Lovex S071 | <<locked>> | 86% | 31,111 psi | 50% | 2336 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 52,243 psi | 84% | 2720 fps | 100% |
| Norma 204 | <<locked>> | 82% | 41,698 psi | 67% | 2575 fps | 95.8% |
| Norma MRP | 64.3 gr | 84% | 35,505 psi | 57% | 2530 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 39,711 psi | 64% | 2543 fps | 99.2% |
| Ramshot Grand | <<locked>> | 92% | 42,612 psi | 68% | 2667 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 38,609 psi | 62% | 2533 fps | 97.7% |
| Ramshot Magnum | <<locked>> | 92% | 37,927 psi | 61% | 2552 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,079 psi | 45% | 1575 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,096 psi | 80% | 2677 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,166 psi | 76% | 2726 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,001 psi | 64% | 2569 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,551 psi | 62% | 2579 fps | 98.7% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 35,186 psi | 56% | 2556 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 47,137 psi | 76% | 2625 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 42,873 psi | 69% | 2572 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 86% | 40,248 psi | 65% | 2569 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 43,845 psi | 70% | 2562 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,786 psi | 69% | 2539 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 51,677 psi | 83% | 2667 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,988 psi | 66% | 2526 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,385 psi | 78% | 2680 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,095 psi | 77% | 2526 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,829 psi | 67% | 2487 fps | 97.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 39,885 psi | 64% | 2562 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 47,326 psi | 76% | 2625 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 46,789 psi | 75% | 2615 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 36,434 psi | 58% | 2503 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 35,853 psi | 57% | 2444 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 45,165 psi | 72% | 2552 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,249 psi | 66% | 2543 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 88% | 37,637 psi | 60% | 2477 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 52,257 psi | 84% | 2651 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,712 psi | 65% | 2543 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 80% | 31,865 psi | 51% | 2402 fps | 97.9% |
| Vihtavuori N560 | 70.4 gr | 92% | 47,065 psi | 75% | 2756 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 98% | 46,253 psi | 74% | 2733 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,103 psi | 64% | 2507 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,221 psi | 68% | 2598 fps | 97.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,367 psi | 41% | 2313 fps | 97.2% |
| Winchester Supreme 780 | <<locked>> | 88% | 40,103 psi | 64% | 2533 fps | 95.5% |
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 86 powders for .300 Win. Mag. loaded with the .308 | 190gr | Sierra MatchKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,930 fps; across all powders the maximum-charge window runs from 1,719 fps to 2,930 fps. ADI AR 2225 gives the best case fill at 100 %, and 86 of the 86 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 190.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-23, 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. Norma MRP, Vihtavuori N560, Alliant Reloder-26 rank at the top here: for .300 Win. Mag. with the .308 | 190gr | Sierra MatchKing 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.