Load Specifications
Load data in caliber .300 WSM with .308 | 154gr | MEN SF bullet and 96 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% | 55,811 psi | 87% | 2900 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,766 psi | 86% | 2927 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,940 psi | 86% | 2982 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 55,056 psi | 86% | 2927 fps | 96.7% |
| Accurate 4064 | <<locked>> | 90% | 54,766 psi | 86% | 2976 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,679 psi | 86% | 3058 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 86% | 54,969 psi | 86% | 3005 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 56,217 psi | 88% | 3005 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,435 psi | 90% | 3009 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,042 psi | 86% | 2933 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,665 psi | 86% | 3127 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,304 psi | 88% | 3031 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,652 psi | 89% | 3051 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,811 psi | 87% | 3117 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 96% | 57,261 psi | 90% | 3156 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,030 psi | 63% | 2835 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,846 psi | 70% | 3005 fps | 97.9% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,824 psi | 86% | 3018 fps | 99.5% |
| Bofors RP3 | <<locked>> | 92% | 56,869 psi | 89% | 3045 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 57,000 psi | 89% | 3012 fps | 97.3% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,622 psi | 87% | 2940 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 57,145 psi | 90% | 3038 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,288 psi | 87% | 3087 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 84% | 57,392 psi | 90% | 2989 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 54,143 psi | 85% | 3002 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 94% | 55,622 psi | 87% | 3081 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 98% | 56,086 psi | 88% | 3038 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 86% | 55,521 psi | 87% | 3015 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,170 psi | 82% | 2986 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,114 psi | 86% | 3051 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,621 psi | 86% | 3087 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,592 psi | 56% | 1854 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,840 psi | 88% | 3005 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 57,638 psi | 90% | 3028 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 54,665 psi | 86% | 2976 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 94% | 57,450 psi | 90% | 2999 fps | 97.9% |
| IMR 4350ᴾ | <<locked>> | 100% | 57,217 psi | 90% | 3038 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,390 psi | 87% | 2992 fps | 97.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,052 psi | 77% | 2949 fps | 98.9% |
| IMR 4895 | <<locked>> | 88% | 54,679 psi | 86% | 3028 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 57,435 psi | 90% | 3009 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,940 psi | 86% | 2982 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,636 psi | 86% | 2933 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 55,477 psi | 87% | 2986 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,839 psi | 86% | 2986 fps | 98.6% |
| Lovex S070 | <<locked>> | 98% | 55,709 psi | 87% | 3022 fps | 97.9% |
| Norma 201 | <<locked>> | 88% | 57,290 psi | 90% | 3005 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,375 psi | 85% | 2953 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,898 psi | 88% | 3038 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 57,203 psi | 90% | 3097 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 90% | 56,797 psi | 89% | 3068 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,275 psi | 88% | 3097 fps | 98.6% |
| Ramshot TAC | <<locked>> | 84% | 54,230 psi | 85% | 2972 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 86% | 57,667 psi | 90% | 3048 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,897 psi | 86% | 2956 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,013 psi | 56% | 1896 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,840 psi | 89% | 2986 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,621 psi | 86% | 2986 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 57,392 psi | 90% | 3123 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,971 psi | 89% | 3156 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,476 psi | 85% | 3081 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,925 psi | 85% | 3104 fps | 99.1% |
| Rottweil R 901 | <<locked>> | 84% | 54,868 psi | 86% | 2936 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,447 psi | 85% | 2953 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,724 psi | 89% | 3035 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 57,000 psi | 89% | 3012 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,839 psi | 86% | 2986 fps | 98.6% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,940 psi | 86% | 2982 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,477 psi | 87% | 2986 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,709 psi | 87% | 3022 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,955 psi | 86% | 3045 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,594 psi | 89% | 3009 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 57,000 psi | 89% | 3031 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,245 psi | 87% | 2890 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,506 psi | 87% | 2887 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,042 psi | 86% | 2933 fps | 97.5% |
| Somchem S321 | <<locked>> | 82% | 55,143 psi | 86% | 2986 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,737 psi | 86% | 2887 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,898 psi | 88% | 2995 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 56,855 psi | 89% | 3031 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,663 psi | 81% | 3048 fps | 100% |
| Unknown powder | <<locked>> | 96% | 54,810 psi | 86% | 3054 fps | 99.1% |
| Vihtavuori N130 | <<locked>> | 84% | 57,130 psi | 90% | 2884 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 54,984 psi | 86% | 2871 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 57,435 psi | 90% | 2959 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 57,421 psi | 90% | 2969 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 54,926 psi | 86% | 2963 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 55,347 psi | 87% | 3025 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 84% | 57,217 psi | 90% | 3015 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 57,392 psi | 90% | 2999 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 55,695 psi | 87% | 3074 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,874 psi | 69% | 2913 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,608 psi | 89% | 3018 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,926 psi | 86% | 3012 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,622 psi | 87% | 3081 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,955 psi | 56% | 2835 fps | 98.4% |
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% | 49,487 psi | 78% | 2808 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,090 psi | 66% | 2726 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,674 psi | 75% | 2871 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 48,356 psi | 76% | 2815 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 39,784 psi | 62% | 2720 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 35,940 psi | 56% | 2697 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 45,556 psi | 71% | 2841 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 80% | 38,696 psi | 61% | 2677 fps | 97% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,630 psi | 75% | 2848 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 48,240 psi | 76% | 2838 fps | 100% |
| Alliant Power Pro 2000-MR | 57.3 gr | 80% | 41,481 psi | 65% | 2867 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,392 psi | 60% | 2703 fps | 98.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,249 psi | 65% | 2769 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 35,969 psi | 56% | 2710 fps | 95.7% |
| Alliant Reloder-17 | 56.4 gr | 80% | 33,156 psi | 52% | 2661 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,169 psi | 49% | 2602 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 96% | 38,899 psi | 61% | 2864 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,846 psi | 70% | 2841 fps | 98.2% |
| Bofors RP3 | <<locked>> | 80% | 38,174 psi | 60% | 2707 fps | 98.5% |
| Bofors RP7 | <<locked>> | 90% | 47,166 psi | 74% | 2844 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,313 psi | 77% | 2838 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,615 psi | 73% | 2871 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,677 psi | 81% | 3025 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 80% | 50,531 psi | 79% | 2887 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,001 psi | 61% | 2710 fps | 96% |
| Hodgdon H414 | <<locked>> | 88% | 45,165 psi | 71% | 2894 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 96% | 52,721 psi | 83% | 2982 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 80% | 45,977 psi | 72% | 2851 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 31,154 psi | 49% | 2549 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,639 psi | 62% | 2769 fps | 98.8% |
| Hodgdon Superformance | 68.6 gr | 92% | 47,210 psi | 74% | 2953 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,397 psi | 41% | 1654 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,944 psi | 64% | 2736 fps | 98.6% |
| IMR 3031 | <<locked>> | 80% | 41,974 psi | 66% | 2779 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,942 psi | 59% | 2654 fps | 97.1% |
| IMR 4166 Enduron | <<locked>> | 86% | 45,368 psi | 71% | 2782 fps | 95.3% |
| IMR 4350 | <<locked>> | 94% | 47,485 psi | 74% | 2871 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 46,079 psi | 72% | 2825 fps | 95.4% |
| IMR 4831 | <<locked>> | 90% | 35,795 psi | 56% | 2677 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 42,250 psi | 66% | 2802 fps | 98.6% |
| IMR 8208 XBR | <<locked>> | 80% | 47,630 psi | 75% | 2848 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 44,759 psi | 70% | 2818 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,397 psi | 71% | 2772 fps | 99.1% |
| Lovex S062 | <<locked>> | 80% | 40,553 psi | 64% | 2720 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 40,292 psi | 63% | 2713 fps | 95.4% |
| Lovex S070 | <<locked>> | 90% | 43,424 psi | 68% | 2795 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 44,556 psi | 70% | 2789 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 44,918 psi | 70% | 2799 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,611 psi | 64% | 2756 fps | 98.2% |
| Norma URP | <<locked>> | 86% | 36,201 psi | 57% | 2697 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 40,219 psi | 63% | 2769 fps | 98% |
| Ramshot Hunter | <<locked>> | 92% | 43,105 psi | 68% | 2858 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 47,558 psi | 75% | 2854 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,195 psi | 74% | 2874 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,329 psi | 80% | 2900 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,832 psi | 42% | 1696 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,447 psi | 84% | 2936 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,076 psi | 66% | 2753 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,627 psi | 68% | 2881 fps | 98.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,302 psi | 55% | 2733 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 35,781 psi | 56% | 2713 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 38,276 psi | 60% | 2779 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 48,588 psi | 76% | 2835 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,569 psi | 67% | 2740 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 80% | 35,882 psi | 56% | 2648 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 90% | 47,166 psi | 74% | 2844 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 86% | 40,292 psi | 63% | 2713 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,759 psi | 70% | 2818 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,553 psi | 64% | 2720 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 90% | 43,424 psi | 68% | 2795 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,927 psi | 58% | 2700 fps | 97.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,890 psi | 72% | 2825 fps | 97.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,164 psi | 69% | 2808 fps | 98.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,963 psi | 72% | 2743 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,290 psi | 60% | 2602 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 45,339 psi | 71% | 2766 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 51,648 psi | 81% | 2933 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,484 psi | 71% | 2743 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,658 psi | 72% | 2825 fps | 99% |
| Somchem S355 | <<locked>> | 80% | 36,622 psi | 57% | 2654 fps | 97.6% |
| Somchem S365 | <<locked>> | 82% | 28,529 psi | 45% | 2530 fps | 96% |
| Unknown powder | <<locked>> | 86% | 39,305 psi | 62% | 2759 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 50,763 psi | 80% | 2795 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,207 psi | 68% | 2687 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,061 psi | 66% | 2723 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,119 psi | 66% | 2723 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,372 psi | 49% | 2503 fps | 97.4% |
| Vihtavuori N160 | <<locked>> | 84% | 37,028 psi | 58% | 2680 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 50,198 psi | 79% | 2907 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,727 psi | 65% | 2740 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 37,434 psi | 59% | 2720 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 92% | 33,736 psi | 53% | 2687 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,966 psi | 49% | 2503 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 51,387 psi | 81% | 2956 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 45,165 psi | 71% | 2894 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 96% | 31,502 psi | 49% | 2690 fps | 96.1% |
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 96 powders for .300 WSM loaded with the .308 | 154gr | MEN SF. Alliant Reloder-17 delivers the highest muzzle velocity at 3,156 fps; across all powders the maximum-charge window runs from 1,854 fps to 3,156 fps. Alliant Reloder-16 gives the best case fill at 100 %, and 96 of the 96 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 154.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-16, Alliant Reloder-23, Alliant Reloder-26 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 | 154gr | MEN SF 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.