Load Specifications
Load data in caliber .300 WSM with .308 | 152gr | Remington SP Extended-Range 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 Reloder-17, ReloadSwiss RS 60 and ReloadSwiss RS 70.
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% | 57,566 psi | 90% | 2956 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,681 psi | 89% | 2982 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,826 psi | 89% | 3041 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,826 psi | 89% | 3041 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 56,782 psi | 89% | 2989 fps | 97.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,932 psi | 69% | 2871 fps | 96.3% |
| Accurate 4064 | <<locked>> | 90% | 56,811 psi | 89% | 3035 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 57,087 psi | 89% | 3127 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 86% | 56,811 psi | 89% | 3068 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 54,331 psi | 85% | 3012 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,709 psi | 87% | 3015 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,956 psi | 89% | 2989 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,782 psi | 89% | 3196 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,752 psi | 86% | 3038 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,129 psi | 86% | 3058 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 98% | 54,317 psi | 85% | 3127 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,593 psi | 87% | 3163 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,684 psi | 65% | 2900 fps | 99.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,050 psi | 74% | 3077 fps | 98.5% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,855 psi | 89% | 3084 fps | 99.7% |
| Bofors RP3 | <<locked>> | 90% | 55,376 psi | 87% | 3054 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,259 psi | 87% | 3018 fps | 97.2% |
| Hodgdon Benchmark | <<locked>> | 84% | 57,246 psi | 90% | 2995 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,274 psi | 87% | 3045 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 57,464 psi | 90% | 3150 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 82% | 55,608 psi | 87% | 2995 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 56,260 psi | 88% | 3068 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 94% | 57,725 psi | 90% | 3146 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 96% | 54,389 psi | 85% | 3045 fps | 96.4% |
| Hodgdon H4895 | <<locked>> | 86% | 57,450 psi | 90% | 3077 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 54,157 psi | 85% | 3048 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 57,348 psi | 90% | 3114 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 56,710 psi | 89% | 3156 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,752 psi | 56% | 1886 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 57,334 psi | 90% | 3058 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 56,115 psi | 88% | 3038 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 56,434 psi | 88% | 3035 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,898 psi | 88% | 3005 fps | 97.8% |
| IMR 4350 | <<locked>> | 98% | 55,564 psi | 87% | 3045 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 94% | 57,029 psi | 89% | 3051 fps | 97.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,995 psi | 80% | 3012 fps | 99.2% |
| IMR 4895 | <<locked>> | 88% | 56,536 psi | 89% | 3091 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,709 psi | 87% | 3015 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,826 psi | 89% | 3041 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,956 psi | 88% | 2989 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 57,319 psi | 90% | 3045 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,507 psi | 89% | 3045 fps | 98.9% |
| Lovex S070 | <<locked>> | 96% | 54,259 psi | 85% | 3028 fps | 97.8% |
| Norma 201 | <<locked>> | 86% | 55,564 psi | 87% | 3009 fps | 100% |
| Norma 202 | <<locked>> | 86% | 56,101 psi | 88% | 3009 fps | 100% |
| Norma 203B | <<locked>> | 88% | 54,389 psi | 85% | 3045 fps | 99.9% |
| Norma 204 | <<locked>> | 98% | 56,594 psi | 89% | 3100 fps | 96.2% |
| Norma URP | <<locked>> | 98% | 55,927 psi | 88% | 3110 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 88% | 54,940 psi | 86% | 3068 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 98% | 54,781 psi | 86% | 3104 fps | 98.5% |
| Ramshot TAC | <<locked>> | 84% | 55,970 psi | 88% | 3031 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,695 psi | 87% | 3051 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,550 psi | 89% | 3015 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,158 psi | 57% | 1929 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,304 psi | 88% | 3045 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,825 psi | 87% | 3130 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,463 psi | 87% | 3166 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 56,826 psi | 89% | 3146 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 56,144 psi | 88% | 3176 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 84% | 56,304 psi | 88% | 2989 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,101 psi | 88% | 3009 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 55,245 psi | 87% | 3045 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 55,259 psi | 87% | 3018 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,507 psi | 89% | 3045 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,826 psi | 89% | 3041 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 57,319 psi | 90% | 3045 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 54,259 psi | 85% | 3028 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,971 psi | 89% | 3107 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,578 psi | 86% | 3012 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,376 psi | 87% | 3035 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,797 psi | 89% | 2943 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 57,290 psi | 90% | 2943 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 57,087 psi | 89% | 2999 fps | 98% |
| Somchem S321 | <<locked>> | 82% | 57,145 psi | 90% | 3048 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 56,333 psi | 88% | 2940 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,215 psi | 85% | 2999 fps | 99.9% |
| Somchem S355 | <<locked>> | 92% | 55,434 psi | 87% | 3041 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,969 psi | 85% | 3110 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,140 psi | 79% | 2982 fps | 96.1% |
| Unknown powder | <<locked>> | 96% | 56,811 psi | 89% | 3117 fps | 99.4% |
| Vihtavuori N130 | <<locked>> | 82% | 55,274 psi | 87% | 2890 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 56,608 psi | 89% | 2923 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,840 psi | 88% | 2969 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,898 psi | 88% | 2979 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 56,724 psi | 89% | 3018 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 57,522 psi | 90% | 3087 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 82% | 55,288 psi | 87% | 3018 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 55,680 psi | 87% | 3005 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 53,998 psi | 85% | 3077 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,021 psi | 72% | 2982 fps | 99% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,824 psi | 86% | 3022 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,087 psi | 89% | 3071 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 57,725 psi | 90% | 3146 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,391 psi | 59% | 2907 fps | 99.1% |
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% | 50,836 psi | 80% | 2861 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,830 psi | 69% | 2782 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,429 psi | 77% | 2927 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,429 psi | 77% | 2927 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 46,644 psi | 73% | 2815 fps | 95% |
| Accurate 3100 | <<locked>> | 98% | 40,959 psi | 64% | 2812 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 41,452 psi | 65% | 2779 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 35,128 psi | 55% | 2700 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 47,065 psi | 74% | 2900 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 39,885 psi | 63% | 2736 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,110 psi | 77% | 2907 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 49,705 psi | 78% | 2887 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,946 psi | 67% | 2930 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,856 psi | 62% | 2762 fps | 98.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,685 psi | 67% | 2828 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 84% | 34,940 psi | 55% | 2710 fps | 95.4% |
| Alliant Reloder-17 | 58.9 gr | 80% | 34,432 psi | 54% | 2723 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,443 psi | 48% | 2608 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 94% | 37,985 psi | 60% | 2867 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,296 psi | 73% | 2900 fps | 98.5% |
| Bofors RP3 | <<locked>> | 80% | 39,639 psi | 62% | 2766 fps | 98.9% |
| Bofors RP7 | <<locked>> | 90% | 48,675 psi | 76% | 2904 fps | 95.8% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,604 psi | 79% | 2890 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,211 psi | 76% | 2927 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 53,403 psi | 84% | 3087 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 80% | 52,098 psi | 82% | 2943 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,306 psi | 63% | 2766 fps | 96.5% |
| Hodgdon H414 | <<locked>> | 86% | 43,918 psi | 69% | 2897 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 94% | 51,314 psi | 80% | 2989 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 47,514 psi | 74% | 2910 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 30,240 psi | 47% | 2549 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,089 psi | 64% | 2828 fps | 99.1% |
| Hodgdon Superformance | <<locked>> | 90% | 45,788 psi | 72% | 2956 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,513 psi | 42% | 1683 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,076 psi | 66% | 2789 fps | 98.9% |
| IMR 3031 | <<locked>> | 80% | 43,424 psi | 68% | 2835 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,233 psi | 61% | 2713 fps | 97.6% |
| IMR 4166 Enduron | <<locked>> | 84% | 43,961 psi | 69% | 2785 fps | 95.1% |
| IMR 4350 | <<locked>> | 92% | 46,035 psi | 72% | 2874 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,715 psi | 70% | 2828 fps | 95.2% |
| IMR 4831 | <<locked>> | 88% | 34,969 psi | 55% | 2680 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 43,758 psi | 69% | 2864 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 49,110 psi | 77% | 2907 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 46,514 psi | 73% | 2877 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,644 psi | 73% | 2828 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 41,872 psi | 66% | 2776 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 39,088 psi | 61% | 2713 fps | 95.2% |
| Lovex S070 | <<locked>> | 90% | 44,918 psi | 70% | 2858 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 46,137 psi | 72% | 2848 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 46,514 psi | 73% | 2854 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,076 psi | 66% | 2815 fps | 98.6% |
| Norma 204 | <<locked>> | 96% | 52,736 psi | 83% | 3038 fps | 95.4% |
| Norma URP | <<locked>> | 84% | 35,201 psi | 55% | 2697 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 41,669 psi | 65% | 2828 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 90% | 42,003 psi | 66% | 2861 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 49,110 psi | 77% | 2913 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,718 psi | 76% | 2933 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,011 psi | 83% | 2959 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,948 psi | 42% | 1726 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 43,424 psi | 68% | 2808 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,223 psi | 71% | 2943 fps | 98.7% |
| ReloadSwiss RS 60 | 58.9 gr | 80% | 36,637 psi | 57% | 2795 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 37,376 psi | 59% | 2776 fps | 95.8% |
| ReloadSwiss RS 70 | 65.8 gr | 88% | 39,726 psi | 62% | 2848 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 50,111 psi | 79% | 2890 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,888 psi | 69% | 2795 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 37,333 psi | 59% | 2707 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 90% | 48,675 psi | 76% | 2904 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 39,088 psi | 61% | 2713 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,514 psi | 73% | 2877 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,872 psi | 66% | 2776 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 44,918 psi | 70% | 2858 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,203 psi | 60% | 2756 fps | 97.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,616 psi | 75% | 2887 fps | 98.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,498 psi | 71% | 2864 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,166 psi | 74% | 2795 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,421 psi | 62% | 2651 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,816 psi | 69% | 2766 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 53,214 psi | 83% | 2989 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,992 psi | 74% | 2799 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,152 psi | 74% | 2881 fps | 99.3% |
| Somchem S355 | <<locked>> | 80% | 38,072 psi | 60% | 2713 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 27,731 psi | 43% | 2530 fps | 95.7% |
| Somchem S385 | <<locked>> | 98% | 46,992 psi | 74% | 2923 fps | 95.3% |
| Unknown powder | <<locked>> | 84% | 38,334 psi | 60% | 2762 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 52,083 psi | 82% | 2841 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,512 psi | 70% | 2740 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,395 psi | 68% | 2776 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,439 psi | 68% | 2779 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,430 psi | 51% | 2556 fps | 97.8% |
| Vihtavuori N160 | <<locked>> | 82% | 35,926 psi | 56% | 2680 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 51,822 psi | 81% | 2963 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,120 psi | 68% | 2795 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 36,376 psi | 57% | 2723 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 90% | 33,069 psi | 52% | 2694 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,937 psi | 50% | 2559 fps | 96.3% |
| Winchester 748 | <<locked>> | 80% | 53,040 psi | 83% | 3012 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 43,918 psi | 69% | 2897 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 94% | 30,792 psi | 48% | 2697 fps | 95.9% |
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 | 152gr | Remington SP Extended-Range. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,196 fps; across all powders the maximum-charge window runs from 1,886 fps to 3,196 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 152.0 gr projectile in 0.308" calls for a 1:17.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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-17, ReloadSwiss RS 60, ReloadSwiss RS 70 rank at the top here: for .300 WSM with the .308 | 152gr | Remington SP Extended-Range they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-22, Alliant Reloder-25, Bofors RP15 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.