Load Specifications
Load data in caliber .300 WSM with .308 | 155gr | Sierra Tipped MatchKing bullet and 99 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, Hodgdon Superformance and Alliant Reloder-17.
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 2015 | <<locked>> | 84% | 55,434 psi | 87% | 2884 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 57,435 psi | 90% | 2959 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,201 psi | 85% | 2907 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,143 psi | 85% | 2959 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 54,302 psi | 85% | 2900 fps | 96.5% |
| Accurate 4064 | <<locked>> | 90% | 54,259 psi | 85% | 2956 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 53,737 psi | 84% | 3031 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 86% | 54,476 psi | 85% | 2982 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 55,535 psi | 87% | 2982 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 56,898 psi | 89% | 2986 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,331 psi | 85% | 2913 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,012 psi | 85% | 3100 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,579 psi | 87% | 3009 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,275 psi | 88% | 3031 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,984 psi | 86% | 3091 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 96% | 56,434 psi | 88% | 3130 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,421 psi | 62% | 2808 fps | 98.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,092 psi | 69% | 2976 fps | 97.7% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,201 psi | 85% | 2995 fps | 99.5% |
| Bofors RP3 | <<locked>> | 92% | 56,188 psi | 88% | 3022 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,420 psi | 88% | 2992 fps | 97.2% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,100 psi | 86% | 2917 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,449 psi | 88% | 3018 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,795 psi | 86% | 3064 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 84% | 57,014 psi | 89% | 2972 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 57,246 psi | 90% | 3035 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 94% | 54,795 psi | 86% | 3054 fps | 97.6% |
| Hodgdon H4350 | <<locked>> | 98% | 55,245 psi | 87% | 3012 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 86% | 55,013 psi | 86% | 2995 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,285 psi | 80% | 2959 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 54,679 psi | 86% | 3031 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 53,751 psi | 84% | 3061 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,476 psi | 56% | 1837 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,085 psi | 86% | 2979 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 57,014 psi | 89% | 3009 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 57,725 psi | 90% | 3005 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 94% | 57,058 psi | 89% | 2976 fps | 97.8% |
| IMR 4350ᴾ | <<locked>> | 100% | 56,521 psi | 89% | 3015 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,824 psi | 86% | 2969 fps | 97.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 48,443 psi | 76% | 2927 fps | 98.8% |
| IMR 4895 | <<locked>> | 90% | 57,711 psi | 90% | 3061 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 56,898 psi | 89% | 2986 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 57,290 psi | 90% | 2969 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,143 psi | 85% | 2959 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 57,522 psi | 90% | 2963 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 54,781 psi | 86% | 2963 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 57,406 psi | 90% | 3012 fps | 98.9% |
| Lovex S070 | <<locked>> | 98% | 54,882 psi | 86% | 2995 fps | 97.7% |
| Norma 201 | <<locked>> | 88% | 56,753 psi | 89% | 2982 fps | 100% |
| Norma 202 | <<locked>> | 88% | 57,319 psi | 90% | 2982 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,434 psi | 87% | 3018 fps | 99.9% |
| Norma 204ᴾ | <<locked>> | 100% | 57,377 psi | 90% | 3064 fps | 96.1% |
| Norma URPᴾ | <<locked>> | 100% | 56,681 psi | 89% | 3077 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 90% | 55,883 psi | 88% | 3041 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,245 psi | 87% | 3068 fps | 98.4% |
| Ramshot TAC | <<locked>> | 86% | 57,450 psi | 90% | 3009 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 86% | 57,000 psi | 89% | 3025 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,230 psi | 85% | 2933 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,882 psi | 56% | 1880 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,304 psi | 88% | 2963 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 57,464 psi | 90% | 3015 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 56,594 psi | 89% | 3097 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,115 psi | 88% | 3130 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 57,334 psi | 90% | 3110 fps | 99.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 57,087 psi | 89% | 3143 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 86% | 57,682 psi | 90% | 2963 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 57,087 psi | 89% | 2976 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,970 psi | 88% | 3012 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,420 psi | 88% | 2992 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 98% | 57,406 psi | 90% | 3012 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,143 psi | 85% | 2959 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,781 psi | 86% | 2963 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,882 psi | 86% | 2995 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,331 psi | 85% | 3022 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,941 psi | 88% | 2986 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,362 psi | 88% | 3005 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,723 psi | 86% | 2867 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,071 psi | 86% | 2867 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,563 psi | 86% | 2913 fps | 97.4% |
| Somchem S321 | <<locked>> | 82% | 54,650 psi | 86% | 2966 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 57,624 psi | 90% | 2913 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,274 psi | 87% | 2972 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 56,463 psi | 88% | 3012 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,792 psi | 80% | 3022 fps | 100% |
| Unknown powder | <<locked>> | 98% | 57,522 psi | 90% | 3081 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 84% | 56,782 psi | 89% | 2864 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 57,638 psi | 90% | 2894 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 56,869 psi | 89% | 2940 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 56,942 psi | 89% | 2949 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 57,537 psi | 90% | 2989 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,549 psi | 85% | 2999 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 84% | 56,681 psi | 89% | 2992 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,710 psi | 89% | 2976 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 54,824 psi | 86% | 3048 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,279 psi | 68% | 2894 fps | 98.4% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,985 psi | 88% | 2995 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,389 psi | 85% | 2989 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 54,795 psi | 86% | 3054 fps | 97.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,302 psi | 55% | 2802 fps | 98.1% |
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 2015 | <<locked>> | 80% | 48,820 psi | 77% | 2785 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 53,693 psi | 84% | 2907 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,669 psi | 65% | 2710 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,152 psi | 74% | 2848 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 47,805 psi | 75% | 2789 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 39,378 psi | 62% | 2700 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 35,462 psi | 56% | 2674 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 44,976 psi | 70% | 2815 fps | 99% |
| ADI AR 2208 | <<locked>> | 80% | 38,334 psi | 60% | 2661 fps | 96.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,065 psi | 74% | 2825 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 47,529 psi | 74% | 2815 fps | 100% |
| Alliant Power Pro 2000-MR | 56.4 gr | 80% | 41,060 psi | 64% | 2844 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,058 psi | 60% | 2684 fps | 98.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,712 psi | 64% | 2746 fps | 97.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 35,578 psi | 56% | 2687 fps | 95.4% |
| Alliant Reloder-17 | 55.5 gr | 80% | 32,779 psi | 51% | 2638 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,879 psi | 48% | 2582 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 96% | 38,377 psi | 60% | 2838 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,425 psi | 70% | 2822 fps | 98.1% |
| Bofors RP3 | <<locked>> | 80% | 37,681 psi | 59% | 2684 fps | 98.4% |
| Bofors RP7 | <<locked>> | 90% | 46,789 psi | 73% | 2825 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,747 psi | 76% | 2815 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,122 psi | 72% | 2851 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,937 psi | 80% | 3002 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 80% | 50,111 psi | 79% | 2867 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,508 psi | 60% | 2687 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 88% | 44,585 psi | 70% | 2867 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 96% | 51,909 psi | 81% | 2956 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 45,426 psi | 71% | 2828 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 30,734 psi | 48% | 2526 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,131 psi | 61% | 2746 fps | 98.7% |
| Hodgdon Superformance | 67.5 gr | 92% | 46,615 psi | 73% | 2927 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,339 psi | 41% | 1640 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,422 psi | 63% | 2710 fps | 98.5% |
| IMR 3031 | <<locked>> | 80% | 41,452 psi | 65% | 2759 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,565 psi | 59% | 2635 fps | 97% |
| IMR 4166 Enduron | <<locked>> | 86% | 44,904 psi | 70% | 2759 fps | 95.2% |
| IMR 4350 | <<locked>> | 94% | 46,934 psi | 74% | 2848 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 88% | 45,440 psi | 71% | 2799 fps | 95.2% |
| IMR 4831 | <<locked>> | 90% | 35,172 psi | 55% | 2651 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 41,713 psi | 65% | 2779 fps | 98.5% |
| IMR 8208 XBR | <<locked>> | 80% | 47,065 psi | 74% | 2825 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 53,592 psi | 84% | 2917 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,193 psi | 69% | 2795 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,034 psi | 71% | 2753 fps | 99% |
| Lovex S062 | <<locked>> | 80% | 40,219 psi | 63% | 2700 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 39,856 psi | 62% | 2690 fps | 95.2% |
| Lovex S070 | <<locked>> | 92% | 45,571 psi | 71% | 2828 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 44,208 psi | 69% | 2769 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 44,527 psi | 70% | 2779 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,089 psi | 63% | 2733 fps | 98.1% |
| Norma 204 | <<locked>> | 98% | 53,751 psi | 84% | 3005 fps | 95.3% |
| Norma URP | <<locked>> | 86% | 35,795 psi | 56% | 2677 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 39,755 psi | 62% | 2749 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 92% | 42,612 psi | 67% | 2835 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 47,137 psi | 74% | 2831 fps | 97.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,717 psi | 73% | 2854 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,850 psi | 80% | 2877 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,789 psi | 42% | 1683 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,895 psi | 83% | 2913 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 44,338 psi | 69% | 2785 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,033 psi | 67% | 2858 fps | 98.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,896 psi | 55% | 2713 fps | 99.2% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 37,739 psi | 59% | 2749 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 40,422 psi | 63% | 2822 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 48,182 psi | 76% | 2815 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,989 psi | 66% | 2717 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 80% | 35,534 psi | 56% | 2628 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 90% | 46,789 psi | 73% | 2825 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 86% | 39,856 psi | 62% | 2690 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,193 psi | 69% | 2795 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,219 psi | 63% | 2700 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 92% | 45,571 psi | 71% | 2828 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,463 psi | 57% | 2677 fps | 97% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,469 psi | 71% | 2805 fps | 97.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,671 psi | 68% | 2785 fps | 98.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,542 psi | 71% | 2723 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,927 psi | 59% | 2582 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 44,788 psi | 70% | 2743 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 51,169 psi | 80% | 2913 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,107 psi | 71% | 2723 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,252 psi | 71% | 2802 fps | 98.9% |
| Somchem S355 | <<locked>> | 80% | 36,289 psi | 57% | 2635 fps | 97.5% |
| Somchem S365 | <<locked>> | 82% | 28,152 psi | 44% | 2510 fps | 95.8% |
| Unknown powder | <<locked>> | 86% | 38,899 psi | 61% | 2740 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 50,343 psi | 79% | 2772 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,004 psi | 67% | 2671 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,582 psi | 65% | 2703 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,539 psi | 65% | 2700 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 30,893 psi | 48% | 2480 fps | 97.2% |
| Vihtavuori N160 | <<locked>> | 84% | 36,434 psi | 57% | 2654 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 49,632 psi | 78% | 2881 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,191 psi | 65% | 2720 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 36,970 psi | 58% | 2700 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 92% | 33,199 psi | 52% | 2664 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,676 psi | 48% | 2487 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 50,836 psi | 80% | 2936 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 44,585 psi | 70% | 2867 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 96% | 31,053 psi | 49% | 2664 fps | 95.8% |
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 117 powders for .300 WSM loaded with the .308 | 155gr | Sierra Tipped MatchKing. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,143 fps; across all powders the maximum-charge window runs from 1,837 fps to 3,143 fps. Accurate 3100 gives the best case fill at 100 %, and 117 of the 117 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-16 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 Power Pro 2000-MR, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .300 WSM with the .308 | 155gr | Sierra Tipped MatchKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2209, Alliant Reloder-19, Alliant Reloder-22 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.