Load Specifications
Load data in caliber .300 WSM with .308 | 155gr | Nosler Custom Competition bullet and 99 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 4064, Alliant Reloder-17 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>> | 84% | 57,029 psi | 89% | 2917 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,028 psi | 88% | 2940 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,057 psi | 88% | 2995 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,057 psi | 88% | 2995 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 56,159 psi | 88% | 2943 fps | 97.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,120 psi | 68% | 2825 fps | 96.2% |
| Accurate 4064 | <<locked>> | 90% | 55,970 psi | 88% | 2989 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 56,043 psi | 88% | 3077 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 86% | 56,028 psi | 88% | 3018 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 57,203 psi | 90% | 3022 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,100 psi | 86% | 2969 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,130 psi | 88% | 2943 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,956 psi | 88% | 3146 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 57,363 psi | 90% | 3041 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,389 psi | 85% | 3012 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 57,029 psi | 89% | 3136 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,679 psi | 86% | 3114 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,973 psi | 64% | 2854 fps | 99% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,122 psi | 72% | 3028 fps | 98.4% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,028 psi | 88% | 3035 fps | 99.7% |
| Bofors RP3 | <<locked>> | 90% | 54,447 psi | 85% | 3005 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,505 psi | 85% | 2972 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,637 psi | 89% | 2949 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,534 psi | 85% | 2999 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,739 psi | 89% | 3107 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 82% | 55,042 psi | 86% | 2953 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,405 psi | 87% | 3018 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 94% | 56,826 psi | 89% | 3097 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 98% | 57,290 psi | 90% | 3058 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 86% | 56,623 psi | 89% | 3031 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,461 psi | 84% | 3005 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 56,492 psi | 89% | 3068 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,927 psi | 88% | 3110 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,592 psi | 56% | 1854 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,884 psi | 89% | 3018 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 55,347 psi | 87% | 2992 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,724 psi | 87% | 2989 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,259 psi | 87% | 2963 fps | 97.7% |
| IMR 4350 | <<locked>> | 98% | 54,984 psi | 86% | 3002 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,318 psi | 88% | 3005 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,285 psi | 79% | 2966 fps | 99.2% |
| IMR 4895 | <<locked>> | 88% | 55,767 psi | 87% | 3045 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,100 psi | 86% | 2969 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,057 psi | 88% | 2995 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,390 psi | 87% | 2943 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 56,550 psi | 89% | 2999 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,753 psi | 87% | 2999 fps | 98.9% |
| Lovex S070 | <<locked>> | 98% | 56,898 psi | 89% | 3038 fps | 98.2% |
| Norma 201 | <<locked>> | 86% | 54,955 psi | 86% | 2966 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,506 psi | 87% | 2966 fps | 100% |
| Norma 203B | <<locked>> | 90% | 57,203 psi | 90% | 3054 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,593 psi | 87% | 3051 fps | 96% |
| Norma URP | <<locked>> | 98% | 54,955 psi | 86% | 3061 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 88% | 54,143 psi | 85% | 3022 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 57,421 psi | 90% | 3114 fps | 98.9% |
| Ramshot TAC | <<locked>> | 84% | 55,419 psi | 87% | 2989 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,013 psi | 86% | 3005 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,912 psi | 88% | 2969 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,216 psi | 57% | 1900 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,564 psi | 87% | 2999 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,752 psi | 86% | 3077 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,462 psi | 85% | 3117 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,796 psi | 87% | 3097 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,274 psi | 87% | 3127 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 84% | 55,796 psi | 87% | 2946 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,274 psi | 87% | 2959 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,317 psi | 85% | 2995 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 54,505 psi | 85% | 2972 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,753 psi | 87% | 2999 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,057 psi | 88% | 2995 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,550 psi | 89% | 2999 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,898 psi | 89% | 3038 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,246 psi | 88% | 3061 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 57,624 psi | 90% | 3022 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,462 psi | 85% | 2986 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,115 psi | 88% | 2900 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,550 psi | 89% | 2897 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,173 psi | 88% | 2953 fps | 97.9% |
| Somchem S321 | <<locked>> | 82% | 56,434 psi | 88% | 3002 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,767 psi | 87% | 2900 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 57,159 psi | 90% | 3012 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 54,781 psi | 86% | 2999 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,040 psi | 83% | 3064 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,182 psi | 77% | 2933 fps | 95.9% |
| Unknown powder | <<locked>> | 96% | 56,101 psi | 88% | 3071 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 82% | 54,650 psi | 86% | 2844 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,883 psi | 88% | 2881 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,129 psi | 86% | 2923 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,100 psi | 86% | 2933 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 55,898 psi | 88% | 2972 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 56,579 psi | 89% | 3038 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 54,592 psi | 86% | 2972 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 55,027 psi | 86% | 2963 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 56,913 psi | 89% | 3091 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,353 psi | 71% | 2940 fps | 98.9% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 53,983 psi | 85% | 2979 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,318 psi | 88% | 3028 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,826 psi | 89% | 3097 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,767 psi | 58% | 2861 fps | 98.9% |
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% | 50,401 psi | 79% | 2818 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,033 psi | 67% | 2740 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,820 psi | 77% | 2884 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,820 psi | 77% | 2884 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 49,182 psi | 77% | 2828 fps | 95.6% |
| Accurate 3100 | <<locked>> | 98% | 40,147 psi | 63% | 2762 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 40,712 psi | 64% | 2733 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 34,563 psi | 54% | 2661 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 46,340 psi | 73% | 2851 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 39,421 psi | 62% | 2694 fps | 97.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,443 psi | 76% | 2861 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 49,284 psi | 77% | 2848 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,424 psi | 66% | 2887 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,189 psi | 61% | 2717 fps | 98.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,032 psi | 66% | 2782 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 34,606 psi | 54% | 2671 fps | 95.3% |
| Alliant Reloder-17 | 57.3 gr | 80% | 33,953 psi | 53% | 2684 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,995 psi | 50% | 2628 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 94% | 37,246 psi | 58% | 2822 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,803 psi | 72% | 2858 fps | 98.5% |
| Bofors RP3 | <<locked>> | 80% | 38,986 psi | 61% | 2723 fps | 98.8% |
| Bofors RP7 | <<locked>> | 90% | 48,051 psi | 75% | 2861 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,125 psi | 79% | 2848 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,645 psi | 75% | 2884 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,823 psi | 83% | 3041 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 80% | 51,474 psi | 81% | 2897 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,740 psi | 62% | 2723 fps | 96.4% |
| Hodgdon H414 | <<locked>> | 86% | 43,120 psi | 68% | 2848 fps | 95% |
| Hodgdon H4350 | <<locked>> | 94% | 50,517 psi | 79% | 2943 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 46,833 psi | 73% | 2864 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,849 psi | 47% | 2507 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,437 psi | 63% | 2782 fps | 99.1% |
| Hodgdon Superformance | <<locked>> | 92% | 48,428 psi | 76% | 2976 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,513 psi | 42% | 1657 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,727 psi | 65% | 2749 fps | 98.9% |
| IMR 3031 | <<locked>> | 80% | 42,917 psi | 67% | 2792 fps | 100% |
| IMR 4064 | 51.6 gr | 80% | 38,696 psi | 61% | 2671 fps | 97.5% |
| IMR 4166 Enduron | <<locked>> | 84% | 43,366 psi | 68% | 2740 fps | 95% |
| IMR 4350 | <<locked>> | 92% | 45,498 psi | 71% | 2831 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,019 psi | 69% | 2782 fps | 95% |
| IMR 4831 | <<locked>> | 88% | 34,272 psi | 54% | 2635 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 43,091 psi | 68% | 2815 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 48,443 psi | 76% | 2861 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 45,890 psi | 72% | 2835 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,151 psi | 72% | 2785 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 41,350 psi | 65% | 2733 fps | 99.3% |
| Lovex S065 | <<locked>> | 84% | 38,595 psi | 60% | 2674 fps | 95.1% |
| Lovex S070 | <<locked>> | 90% | 44,280 psi | 69% | 2812 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 45,397 psi | 71% | 2802 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 45,745 psi | 72% | 2808 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,423 psi | 65% | 2772 fps | 98.5% |
| Norma 204 | <<locked>> | 96% | 51,938 psi | 81% | 2989 fps | 95.2% |
| Norma URP | <<locked>> | 84% | 34,664 psi | 54% | 2657 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 41,162 psi | 65% | 2785 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 41,394 psi | 65% | 2818 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 48,457 psi | 76% | 2867 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,182 psi | 76% | 2890 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,243 psi | 82% | 2910 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,977 psi | 42% | 1699 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,975 psi | 67% | 2769 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,556 psi | 70% | 2897 fps | 98.6% |
| ReloadSwiss RS 60 | 57.3 gr | 80% | 36,114 psi | 57% | 2753 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 36,637 psi | 57% | 2733 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 39,160 psi | 61% | 2802 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 49,487 psi | 78% | 2848 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,352 psi | 68% | 2756 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 36,651 psi | 57% | 2661 fps | 98% |
| Rottweil R 907 | <<locked>> | 90% | 48,051 psi | 75% | 2861 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,595 psi | 60% | 2674 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,890 psi | 72% | 2835 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,350 psi | 65% | 2733 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 44,280 psi | 69% | 2812 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,623 psi | 59% | 2713 fps | 97.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,862 psi | 73% | 2841 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,918 psi | 70% | 2822 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,760 psi | 73% | 2756 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,059 psi | 61% | 2615 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,221 psi | 68% | 2726 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 52,678 psi | 83% | 2946 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,253 psi | 72% | 2753 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,630 psi | 73% | 2838 fps | 99.3% |
| Somchem S355 | <<locked>> | 80% | 37,405 psi | 59% | 2667 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 27,267 psi | 43% | 2487 fps | 95.5% |
| Somchem S385 | <<locked>> | 98% | 46,238 psi | 72% | 2881 fps | 95.2% |
| Unknown powder | <<locked>> | 84% | 37,782 psi | 59% | 2720 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 51,648 psi | 81% | 2802 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,048 psi | 69% | 2697 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,004 psi | 67% | 2736 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,917 psi | 67% | 2733 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,937 psi | 50% | 2516 fps | 97.7% |
| Vihtavuori N160 | <<locked>> | 82% | 35,433 psi | 56% | 2641 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 51,082 psi | 80% | 2917 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,467 psi | 67% | 2753 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 35,824 psi | 56% | 2677 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 90% | 32,474 psi | 51% | 2651 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,618 psi | 50% | 2523 fps | 96.2% |
| Winchester 748 | <<locked>> | 80% | 52,431 psi | 82% | 2969 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 43,120 psi | 68% | 2848 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 94% | 30,269 psi | 47% | 2651 fps | 95.6% |
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 118 powders for .300 WSM loaded with the .308 | 155gr | Nosler Custom Competition. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,146 fps; across all powders the maximum-charge window runs from 1,854 fps to 3,146 fps. Accurate 3100 gives the best case fill at 100 %, and 118 of the 118 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.308" calls for a 1:14.5 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. IMR 4064, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .300 WSM with the .308 | 155gr | Nosler Custom Competition 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.