Load Specifications
Load data in caliber .300 WSM with .308 | 150gr | Sierra Pro-Hunter 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.
A valid access license is required to use the Personalized Load Calculator.
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% | 56,260 psi | 88% | 2953 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,303 psi | 87% | 2979 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,274 psi | 87% | 3031 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 55,317 psi | 87% | 2972 fps | 96.6% |
| Accurate 4064 | <<locked>> | 90% | 55,187 psi | 86% | 3025 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,245 psi | 87% | 3110 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 86% | 55,405 psi | 87% | 3054 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 56,492 psi | 89% | 3058 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,302 psi | 85% | 3005 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,187 psi | 86% | 2982 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,303 psi | 87% | 3182 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,536 psi | 89% | 3081 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,232 psi | 90% | 3104 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,260 psi | 88% | 3169 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 94% | 53,940 psi | 85% | 3150 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,393 psi | 63% | 2881 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,455 psi | 71% | 3054 fps | 97.9% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,245 psi | 87% | 3071 fps | 99.5% |
| Bofors RP3 | <<locked>> | 92% | 57,595 psi | 90% | 3100 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 57,319 psi | 90% | 3064 fps | 97.3% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,144 psi | 88% | 2992 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 57,638 psi | 90% | 3094 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,883 psi | 88% | 3140 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 54,273 psi | 85% | 2989 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 54,621 psi | 86% | 3051 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 94% | 56,043 psi | 88% | 3130 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 98% | 56,362 psi | 88% | 3087 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 86% | 55,970 psi | 88% | 3068 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,489 psi | 82% | 3035 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,593 psi | 87% | 3100 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,998 psi | 86% | 3136 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,592 psi | 56% | 1886 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,231 psi | 88% | 3054 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 54,389 psi | 85% | 3028 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,071 psi | 86% | 3025 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 92% | 54,636 psi | 86% | 2995 fps | 97.4% |
| IMR 4350ᴾ | <<locked>> | 100% | 57,682 psi | 90% | 3091 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,825 psi | 87% | 3045 fps | 97.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,588 psi | 78% | 2999 fps | 98.9% |
| IMR 4895 | <<locked>> | 88% | 55,071 psi | 86% | 3081 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 84% | 54,302 psi | 85% | 3005 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,274 psi | 87% | 3031 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,824 psi | 86% | 2982 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 55,854 psi | 88% | 3035 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,172 psi | 86% | 3035 fps | 98.6% |
| Lovex S070 | <<locked>> | 98% | 56,260 psi | 88% | 3071 fps | 97.9% |
| Norma 201 | <<locked>> | 88% | 57,682 psi | 90% | 3054 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,578 psi | 86% | 3002 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,434 psi | 88% | 3091 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 57,682 psi | 90% | 3153 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 90% | 57,101 psi | 89% | 3114 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,579 psi | 89% | 3143 fps | 98.6% |
| Ramshot TAC | <<locked>> | 84% | 54,723 psi | 86% | 3022 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,331 psi | 85% | 3041 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,259 psi | 87% | 3005 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,969 psi | 56% | 1929 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 57,348 psi | 90% | 3038 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,969 psi | 86% | 3035 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,201 psi | 85% | 3117 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 57,493 psi | 90% | 3209 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,853 psi | 86% | 3130 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,433 psi | 85% | 3156 fps | 99.1% |
| Rottweil R 901 | <<locked>> | 84% | 55,027 psi | 86% | 2986 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,665 psi | 86% | 2999 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 57,188 psi | 90% | 3084 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 57,319 psi | 90% | 3064 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,172 psi | 86% | 3035 fps | 98.6% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,274 psi | 87% | 3031 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,854 psi | 88% | 3035 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,260 psi | 88% | 3071 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,332 psi | 87% | 3094 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,797 psi | 89% | 3054 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 57,537 psi | 90% | 3084 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,608 psi | 87% | 2940 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,912 psi | 88% | 2936 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,593 psi | 87% | 2986 fps | 97.5% |
| Somchem S321 | <<locked>> | 82% | 55,738 psi | 87% | 3041 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,984 psi | 86% | 2936 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,333 psi | 88% | 3045 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 57,348 psi | 90% | 3084 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,127 psi | 82% | 3097 fps | 100% |
| Unknown powder | <<locked>> | 96% | 55,172 psi | 86% | 3104 fps | 99% |
| Vihtavuori N130 | <<locked>> | 84% | 57,624 psi | 90% | 2936 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,114 psi | 86% | 2917 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,491 psi | 85% | 2966 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,433 psi | 85% | 2969 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 55,303 psi | 87% | 3012 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 55,854 psi | 88% | 3074 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 82% | 54,041 psi | 85% | 3012 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,317 psi | 85% | 2999 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 56,188 psi | 88% | 3127 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,367 psi | 70% | 2963 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 57,305 psi | 90% | 3071 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,550 psi | 87% | 3064 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,043 psi | 88% | 3130 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,143 psi | 57% | 2877 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% | 49,777 psi | 78% | 2858 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,569 psi | 67% | 2776 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,196 psi | 76% | 2920 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 48,472 psi | 76% | 2858 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 40,234 psi | 63% | 2766 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 36,361 psi | 57% | 2743 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 45,934 psi | 72% | 2890 fps | 99% |
| ADI AR 2208 | <<locked>> | 80% | 39,073 psi | 61% | 2726 fps | 97% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,964 psi | 75% | 2897 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 48,530 psi | 76% | 2884 fps | 100% |
| Alliant Power Pro 2000-MR | 58.9 gr | 80% | 41,872 psi | 66% | 2917 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,769 psi | 61% | 2749 fps | 98.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,582 psi | 65% | 2818 fps | 97.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 36,376 psi | 57% | 2756 fps | 95.6% |
| Alliant Reloder-17 | 58 gr | 80% | 33,504 psi | 53% | 2710 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,473 psi | 49% | 2648 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 96% | 39,334 psi | 62% | 2913 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,237 psi | 71% | 2890 fps | 98.1% |
| Bofors RP3 | <<locked>> | 80% | 38,493 psi | 60% | 2753 fps | 98.5% |
| Bofors RP7 | <<locked>> | 90% | 47,471 psi | 74% | 2890 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,472 psi | 78% | 2884 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,065 psi | 74% | 2920 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,083 psi | 82% | 3077 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 80% | 51,024 psi | 80% | 2940 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,291 psi | 62% | 2756 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 88% | 45,542 psi | 71% | 2940 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 96% | 53,113 psi | 83% | 3031 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 80% | 46,340 psi | 73% | 2900 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 31,227 psi | 49% | 2585 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,943 psi | 63% | 2815 fps | 98.8% |
| Hodgdon Superformance | 70.5 gr | 92% | 47,747 psi | 75% | 3002 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,411 psi | 41% | 1686 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,205 psi | 65% | 2782 fps | 98.6% |
| IMR 3031 | <<locked>> | 80% | 42,293 psi | 66% | 2828 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,189 psi | 60% | 2700 fps | 97% |
| IMR 4166 Enduron | <<locked>> | 86% | 45,600 psi | 71% | 2828 fps | 95.3% |
| IMR 4350 | <<locked>> | 94% | 47,805 psi | 75% | 2920 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 46,398 psi | 73% | 2871 fps | 95.4% |
| IMR 4831 | <<locked>> | 90% | 35,940 psi | 56% | 2717 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 42,612 psi | 67% | 2851 fps | 98.6% |
| IMR 8208 XBR | <<locked>> | 80% | 47,964 psi | 75% | 2897 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 45,295 psi | 71% | 2867 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,788 psi | 72% | 2822 fps | 99.1% |
| Lovex S062 | <<locked>> | 80% | 40,959 psi | 64% | 2769 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 40,509 psi | 63% | 2756 fps | 95.4% |
| Lovex S070 | <<locked>> | 90% | 43,714 psi | 69% | 2844 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 44,976 psi | 70% | 2838 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 45,310 psi | 71% | 2848 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,959 psi | 64% | 2805 fps | 98.2% |
| Norma URP | <<locked>> | 86% | 36,564 psi | 57% | 2743 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 40,625 psi | 64% | 2818 fps | 98% |
| Ramshot Hunter | <<locked>> | 92% | 43,424 psi | 68% | 2904 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 47,921 psi | 75% | 2900 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,601 psi | 75% | 2923 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,706 psi | 81% | 2946 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,847 psi | 42% | 1729 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,795 psi | 84% | 2986 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,264 psi | 66% | 2795 fps | 95% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,976 psi | 69% | 2930 fps | 98.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,665 psi | 56% | 2782 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 36,158 psi | 57% | 2762 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 38,740 psi | 61% | 2828 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 48,863 psi | 77% | 2884 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,772 psi | 67% | 2785 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 80% | 36,230 psi | 57% | 2694 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 90% | 47,471 psi | 74% | 2890 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 86% | 40,509 psi | 63% | 2756 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,295 psi | 71% | 2867 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,959 psi | 64% | 2769 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 90% | 43,714 psi | 69% | 2844 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,159 psi | 58% | 2743 fps | 97.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,296 psi | 73% | 2874 fps | 97.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,411 psi | 70% | 2854 fps | 98.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,209 psi | 72% | 2792 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,537 psi | 60% | 2648 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 45,585 psi | 71% | 2812 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 52,083 psi | 82% | 2982 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,876 psi | 72% | 2792 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,064 psi | 72% | 2871 fps | 99% |
| Somchem S355 | <<locked>> | 80% | 36,999 psi | 58% | 2700 fps | 97.6% |
| Somchem S365 | <<locked>> | 82% | 28,616 psi | 45% | 2569 fps | 95.8% |
| Unknown powder | <<locked>> | 86% | 39,697 psi | 62% | 2805 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 51,068 psi | 80% | 2841 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,569 psi | 68% | 2736 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,380 psi | 66% | 2769 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,308 psi | 66% | 2769 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,473 psi | 49% | 2543 fps | 97.3% |
| Vihtavuori N160 | <<locked>> | 84% | 37,202 psi | 58% | 2720 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 50,604 psi | 79% | 2956 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,003 psi | 66% | 2789 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 37,768 psi | 59% | 2766 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 92% | 33,997 psi | 53% | 2730 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,212 psi | 49% | 2546 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 51,779 psi | 81% | 3009 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 45,542 psi | 71% | 2940 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 96% | 31,807 psi | 50% | 2736 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 | 150gr | Sierra Pro-Hunter. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,209 fps; across all powders the maximum-charge window runs from 1,886 fps to 3,209 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 150.0 gr projectile in 0.308" calls for a 1:15.5 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 | 150gr | Sierra Pro-Hunter 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.