Load Specifications
Load data in caliber .300 WSM with .308 | 155gr | Atomic 29 HP 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 ReloadSwiss RS 60.
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>> | 86% | 57,653 psi | 90% | 2920 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,970 psi | 88% | 2946 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 56,855 psi | 89% | 2966 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,521 psi | 89% | 2999 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 56,826 psi | 89% | 2943 fps | 97% |
| Accurate 4064 | <<locked>> | 92% | 57,740 psi | 90% | 3002 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 53,983 psi | 85% | 3035 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 86% | 54,418 psi | 85% | 2982 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 55,477 psi | 87% | 2979 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 56,855 psi | 89% | 2986 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,331 psi | 85% | 2910 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,244 psi | 85% | 3104 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,564 psi | 87% | 3005 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,202 psi | 88% | 3031 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,187 psi | 86% | 3091 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 96% | 56,681 psi | 89% | 3133 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,581 psi | 62% | 2812 fps | 98.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,280 psi | 69% | 2976 fps | 97.7% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,389 psi | 85% | 2999 fps | 99.5% |
| Bofors RP3 | <<locked>> | 92% | 56,420 psi | 88% | 3025 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,391 psi | 88% | 2989 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,303 psi | 87% | 2920 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 55,129 psi | 86% | 3002 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 57,450 psi | 90% | 3110 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 84% | 56,971 psi | 89% | 2969 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 57,246 psi | 90% | 3035 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 94% | 54,766 psi | 86% | 3051 fps | 97.6% |
| Hodgdon H4350 | <<locked>> | 98% | 54,375 psi | 85% | 2999 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 86% | 54,984 psi | 86% | 2995 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,300 psi | 80% | 2959 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 57,000 psi | 89% | 3071 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 53,940 psi | 85% | 3061 fps | 97% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,476 psi | 56% | 1837 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 57,551 psi | 90% | 3022 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 56,956 psi | 89% | 3005 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 57,667 psi | 90% | 3005 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 94% | 57,072 psi | 89% | 2976 fps | 97.8% |
| IMR 4350ᴾ | <<locked>> | 100% | 56,463 psi | 88% | 3009 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 96% | 57,217 psi | 90% | 3012 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 48,370 psi | 76% | 2923 fps | 98.7% |
| IMR 4895 | <<locked>> | 90% | 57,653 psi | 90% | 3061 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 56,855 psi | 89% | 2986 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 57,261 psi | 90% | 2969 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,389 psi | 85% | 2959 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 57,479 psi | 90% | 2963 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 54,998 psi | 86% | 2963 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 57,624 psi | 90% | 3015 fps | 98.9% |
| Lovex S070 | <<locked>> | 98% | 55,129 psi | 86% | 2995 fps | 97.7% |
| Norma 201 | <<locked>> | 88% | 56,695 psi | 89% | 2979 fps | 100% |
| Norma 202 | <<locked>> | 88% | 57,261 psi | 90% | 2982 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,405 psi | 87% | 3015 fps | 99.9% |
| Norma 204ᴾ | <<locked>> | 100% | 57,595 psi | 90% | 3068 fps | 96.1% |
| Norma URPᴾ | <<locked>> | 100% | 56,608 psi | 89% | 3074 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 90% | 56,101 psi | 88% | 3041 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,521 psi | 87% | 3071 fps | 98.4% |
| Ramshot TAC | <<locked>> | 86% | 57,464 psi | 90% | 3009 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 86% | 56,942 psi | 89% | 3025 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,215 psi | 85% | 2930 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,868 psi | 56% | 1880 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,246 psi | 88% | 2963 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 57,464 psi | 90% | 3015 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 56,869 psi | 89% | 3100 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,333 psi | 88% | 3133 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 57,551 psi | 90% | 3114 fps | 99.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 57,101 psi | 89% | 3143 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 86% | 57,624 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% | 56,391 psi | 88% | 2989 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 98% | 57,624 psi | 90% | 3015 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,389 psi | 85% | 2959 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,998 psi | 86% | 2963 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 57,334 psi | 90% | 3035 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,317 psi | 85% | 3022 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,912 psi | 88% | 2986 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,565 psi | 89% | 3009 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,665 psi | 86% | 2867 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,998 psi | 86% | 2864 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,476 psi | 85% | 2910 fps | 97.3% |
| Somchem S321 | <<locked>> | 82% | 54,665 psi | 86% | 2966 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 57,566 psi | 90% | 2913 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,477 psi | 87% | 2976 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 56,391 psi | 88% | 3009 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,807 psi | 80% | 3022 fps | 100% |
| Unknown powder | <<locked>> | 96% | 53,925 psi | 85% | 3025 fps | 98.9% |
| Vihtavuori N130 | <<locked>> | 84% | 56,724 psi | 89% | 2864 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 57,580 psi | 90% | 2890 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 55,506 psi | 87% | 2927 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 56,956 psi | 89% | 2946 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 54,215 psi | 85% | 2940 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,752 psi | 86% | 2999 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 84% | 56,623 psi | 89% | 2992 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,637 psi | 89% | 2976 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 54,824 psi | 86% | 3048 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,250 psi | 68% | 2890 fps | 98.4% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,912 psi | 88% | 2995 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,404 psi | 85% | 2989 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 54,766 psi | 86% | 3051 fps | 97.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,447 psi | 56% | 2805 fps | 98.2% |
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% | 47,718 psi | 75% | 2776 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,243 psi | 82% | 2890 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,659 psi | 73% | 2815 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,716 psi | 72% | 2828 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 49,879 psi | 78% | 2831 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 39,392 psi | 62% | 2700 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 35,462 psi | 56% | 2674 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 45,179 psi | 71% | 2818 fps | 99% |
| ADI AR 2208 | <<locked>> | 80% | 38,348 psi | 60% | 2657 fps | 96.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,268 psi | 74% | 2828 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 47,485 psi | 74% | 2815 fps | 100% |
| Alliant Power Pro 2000-MR | 56.4 gr | 80% | 41,017 psi | 64% | 2841 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,014 psi | 60% | 2680 fps | 98.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,901 psi | 64% | 2749 fps | 97.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 35,578 psi | 56% | 2687 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,750 psi | 51% | 2638 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,835 psi | 48% | 2582 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 96% | 38,319 psi | 60% | 2838 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,382 psi | 70% | 2822 fps | 98% |
| Bofors RP3 | <<locked>> | 80% | 37,623 psi | 59% | 2684 fps | 98.3% |
| Bofors RP7 | <<locked>> | 90% | 46,731 psi | 73% | 2822 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,965 psi | 77% | 2818 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,846 psi | 70% | 2831 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 49,734 psi | 78% | 2986 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 80% | 50,053 psi | 78% | 2867 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,508 psi | 60% | 2687 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 88% | 44,570 psi | 70% | 2867 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 96% | 51,024 psi | 80% | 2943 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 45,629 psi | 72% | 2831 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 30,734 psi | 48% | 2526 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,364 psi | 63% | 2779 fps | 98.9% |
| 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% | 39,378 psi | 62% | 2694 fps | 98.3% |
| IMR 3031 | <<locked>> | 80% | 41,466 psi | 65% | 2756 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,550 psi | 59% | 2635 fps | 97% |
| IMR 4166 Enduron | <<locked>> | 86% | 44,860 psi | 70% | 2759 fps | 95.1% |
| IMR 4350 | <<locked>> | 94% | 46,905 psi | 74% | 2848 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 88% | 44,643 psi | 70% | 2789 fps | 95% |
| IMR 4831 | <<locked>> | 90% | 35,346 psi | 55% | 2654 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 41,916 psi | 66% | 2782 fps | 98.5% |
| IMR 8208 XBR | <<locked>> | 80% | 47,268 psi | 74% | 2828 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 53,519 psi | 84% | 2913 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,411 psi | 70% | 2799 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,020 psi | 71% | 2753 fps | 99% |
| Lovex S062 | <<locked>> | 80% | 40,176 psi | 63% | 2700 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 39,842 psi | 62% | 2690 fps | 95.2% |
| Lovex S070 | <<locked>> | 92% | 45,571 psi | 71% | 2828 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 44,150 psi | 69% | 2769 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 44,527 psi | 70% | 2779 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,277 psi | 63% | 2736 fps | 98.1% |
| Norma 204 | <<locked>> | 98% | 53,693 psi | 84% | 3005 fps | 95.3% |
| Norma URP | <<locked>> | 86% | 35,752 psi | 56% | 2677 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 39,740 psi | 62% | 2746 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 92% | 42,598 psi | 67% | 2835 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 47,123 psi | 74% | 2831 fps | 97.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,702 psi | 73% | 2854 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,865 psi | 80% | 2877 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,774 psi | 42% | 1683 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,837 psi | 83% | 2913 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 44,280 psi | 69% | 2782 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,047 psi | 67% | 2854 fps | 98.2% |
| ReloadSwiss RS 60 | 55.5 gr | 80% | 34,853 psi | 55% | 2710 fps | 99.2% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 37,724 psi | 59% | 2749 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 40,596 psi | 64% | 2822 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 48,124 psi | 75% | 2812 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,148 psi | 66% | 2720 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 80% | 35,491 psi | 56% | 2628 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 90% | 46,731 psi | 73% | 2822 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 86% | 39,842 psi | 62% | 2690 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,411 psi | 70% | 2799 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,176 psi | 63% | 2700 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 92% | 44,295 psi | 69% | 2808 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,419 psi | 57% | 2677 fps | 97% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,411 psi | 71% | 2802 fps | 97.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,627 psi | 68% | 2785 fps | 98.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,556 psi | 71% | 2723 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,913 psi | 59% | 2582 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 44,744 psi | 70% | 2743 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 51,155 psi | 80% | 2910 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,121 psi | 71% | 2723 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,194 psi | 71% | 2802 fps | 98.9% |
| Somchem S355 | <<locked>> | 80% | 36,260 psi | 57% | 2631 fps | 97.5% |
| Somchem S365 | <<locked>> | 82% | 28,123 psi | 44% | 2507 fps | 95.7% |
| Unknown powder | <<locked>> | 86% | 38,856 psi | 61% | 2736 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 50,299 psi | 79% | 2772 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,960 psi | 67% | 2671 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,335 psi | 63% | 2687 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,539 psi | 65% | 2700 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,009 psi | 49% | 2484 fps | 97.2% |
| Vihtavuori N160 | <<locked>> | 84% | 36,608 psi | 57% | 2657 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 49,588 psi | 78% | 2881 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,176 psi | 65% | 2717 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 36,985 psi | 58% | 2700 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 92% | 33,156 psi | 52% | 2661 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,632 psi | 48% | 2484 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 50,778 psi | 80% | 2933 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 44,570 psi | 70% | 2867 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 96% | 31,038 psi | 49% | 2661 fps | 95.7% |
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 | Atomic 29 HP. 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, ReloadSwiss RS 60 rank at the top here: for .300 WSM with the .308 | 155gr | Atomic 29 HP 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.