Load Specifications
Load data in caliber .300 WSM with .308 | 150gr | Speer TBBC bullet and 97 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% | 55,767 psi | 87% | 2943 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,824 psi | 86% | 2969 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,824 psi | 86% | 3022 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 54,824 psi | 86% | 2963 fps | 96.5% |
| Accurate 4064 | <<locked>> | 90% | 54,723 psi | 86% | 3015 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,592 psi | 86% | 3097 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 86% | 55,013 psi | 86% | 3048 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 56,144 psi | 88% | 3048 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,435 psi | 90% | 3051 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,940 psi | 86% | 2976 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,723 psi | 86% | 3169 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,188 psi | 88% | 3071 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,565 psi | 89% | 3091 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,753 psi | 87% | 3159 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 96% | 57,363 psi | 90% | 3202 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,972 psi | 63% | 2871 fps | 98.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,817 psi | 70% | 3038 fps | 97.7% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,897 psi | 86% | 3061 fps | 99.5% |
| Bofors RP3 | <<locked>> | 92% | 56,913 psi | 89% | 3087 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,782 psi | 89% | 3051 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,738 psi | 87% | 2982 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,985 psi | 89% | 3077 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,201 psi | 87% | 3127 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 84% | 57,276 psi | 90% | 3031 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 54,230 psi | 85% | 3041 fps | 99% |
| Hodgdon H414 | <<locked>> | 94% | 55,477 psi | 87% | 3120 fps | 97.6% |
| Hodgdon H4350 | <<locked>> | 98% | 56,028 psi | 88% | 3077 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 86% | 55,550 psi | 87% | 3061 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,141 psi | 82% | 3028 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,187 psi | 86% | 3094 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,563 psi | 86% | 3127 fps | 97% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,563 psi | 56% | 1883 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,550 psi | 87% | 3041 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 57,479 psi | 90% | 3071 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 54,650 psi | 86% | 3015 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 94% | 57,363 psi | 90% | 3035 fps | 97.7% |
| IMR 4350ᴾ | <<locked>> | 100% | 57,159 psi | 90% | 3074 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,245 psi | 87% | 3028 fps | 97.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 48,994 psi | 77% | 2986 fps | 98.8% |
| IMR 4895 | <<locked>> | 88% | 54,665 psi | 86% | 3071 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 57,435 psi | 90% | 3051 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 57,740 psi | 90% | 3035 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,824 psi | 86% | 3022 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,462 psi | 85% | 2972 fps | 99.8% |
| Lovex S062 | <<locked>> | 90% | 55,492 psi | 87% | 3028 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,650 psi | 86% | 3022 fps | 98.5% |
| Lovex S070 | <<locked>> | 98% | 55,695 psi | 87% | 3058 fps | 97.7% |
| Norma 201 | <<locked>> | 88% | 57,305 psi | 90% | 3045 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,172 psi | 85% | 2992 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,796 psi | 87% | 3077 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 57,087 psi | 89% | 3140 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 90% | 56,739 psi | 89% | 3107 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,014 psi | 88% | 3133 fps | 98.4% |
| Ramshot TAC | <<locked>> | 84% | 54,172 psi | 85% | 3009 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 86% | 57,493 psi | 90% | 3087 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,665 psi | 86% | 2995 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,940 psi | 56% | 1926 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,927 psi | 89% | 3031 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,447 psi | 85% | 3022 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 57,232 psi | 90% | 3163 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,898 psi | 89% | 3199 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,302 psi | 85% | 3117 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,954 psi | 85% | 3146 fps | 99% |
| Rottweil R 901 | <<locked>> | 84% | 54,810 psi | 86% | 2976 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 57,653 psi | 90% | 3041 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,768 psi | 89% | 3077 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,782 psi | 89% | 3051 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,650 psi | 86% | 3022 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,824 psi | 86% | 3022 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,492 psi | 87% | 3028 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,695 psi | 87% | 3058 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,969 psi | 86% | 3087 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,420 psi | 88% | 3045 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,869 psi | 89% | 3071 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,158 psi | 86% | 2930 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,521 psi | 87% | 2927 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,013 psi | 86% | 2972 fps | 97.3% |
| Somchem S321 | <<locked>> | 82% | 55,100 psi | 86% | 3028 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,534 psi | 85% | 2927 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,028 psi | 88% | 3038 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 56,942 psi | 89% | 3074 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,517 psi | 81% | 3084 fps | 100% |
| Unknown powder | <<locked>> | 96% | 54,549 psi | 85% | 3091 fps | 98.9% |
| Vihtavuori N130 | <<locked>> | 84% | 57,130 psi | 90% | 2927 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 54,926 psi | 86% | 2913 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 57,479 psi | 90% | 3002 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 57,406 psi | 90% | 3009 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 54,708 psi | 86% | 2999 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 55,274 psi | 87% | 3061 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 84% | 57,058 psi | 89% | 3054 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 57,246 psi | 90% | 3038 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 55,608 psi | 87% | 3114 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,801 psi | 69% | 2949 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,594 psi | 89% | 3058 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,868 psi | 86% | 3051 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,477 psi | 87% | 3120 fps | 97.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,810 psi | 56% | 2864 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% | 49,313 psi | 77% | 2848 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,090 psi | 66% | 2766 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,790 psi | 75% | 2910 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 48,196 psi | 76% | 2848 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 39,798 psi | 62% | 2756 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 35,955 psi | 56% | 2730 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 45,498 psi | 71% | 2877 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 80% | 38,667 psi | 61% | 2717 fps | 96.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,543 psi | 75% | 2887 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 47,964 psi | 75% | 2874 fps | 100% |
| Alliant Power Pro 2000-MR | 58.4 gr | 80% | 41,524 psi | 65% | 2907 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,363 psi | 60% | 2740 fps | 98.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,220 psi | 65% | 2808 fps | 97.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 36,013 psi | 56% | 2746 fps | 95.4% |
| Alliant Reloder-17 | 57.5 gr | 80% | 33,199 psi | 52% | 2697 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,096 psi | 49% | 2631 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 96% | 38,899 psi | 61% | 2900 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,860 psi | 70% | 2881 fps | 98% |
| Bofors RP3 | <<locked>> | 80% | 38,116 psi | 60% | 2743 fps | 98.3% |
| Bofors RP7 | <<locked>> | 90% | 47,152 psi | 74% | 2881 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,342 psi | 77% | 2877 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,659 psi | 73% | 2910 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,416 psi | 81% | 3061 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 80% | 50,531 psi | 79% | 2930 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,914 psi | 61% | 2746 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 88% | 44,976 psi | 70% | 2927 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 96% | 52,518 psi | 82% | 3018 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 45,934 psi | 72% | 2890 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 31,096 psi | 49% | 2582 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,537 psi | 62% | 2805 fps | 98.6% |
| Hodgdon Superformance | 69.9 gr | 92% | 47,297 psi | 74% | 2992 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,498 psi | 42% | 1686 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,799 psi | 64% | 2769 fps | 98.5% |
| IMR 3031 | <<locked>> | 80% | 41,800 psi | 66% | 2815 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,985 psi | 60% | 2694 fps | 96.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 45,252 psi | 71% | 2818 fps | 95.1% |
| IMR 4350 | <<locked>> | 94% | 47,326 psi | 74% | 2907 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 88% | 45,890 psi | 72% | 2861 fps | 95.2% |
| IMR 4831 | <<locked>> | 90% | 35,621 psi | 56% | 2707 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 42,221 psi | 66% | 2838 fps | 98.4% |
| IMR 8208 XBR | <<locked>> | 80% | 47,543 psi | 75% | 2887 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 54,085 psi | 85% | 2979 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,860 psi | 70% | 2858 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,368 psi | 71% | 2812 fps | 99% |
| Lovex S062 | <<locked>> | 80% | 40,582 psi | 64% | 2759 fps | 99% |
| Lovex S065 | <<locked>> | 86% | 40,176 psi | 63% | 2746 fps | 95.2% |
| Lovex S070 | <<locked>> | 92% | 46,035 psi | 72% | 2887 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 44,541 psi | 70% | 2828 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 44,904 psi | 70% | 2838 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,582 psi | 64% | 2792 fps | 98% |
| Norma URP | <<locked>> | 86% | 36,230 psi | 57% | 2733 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 40,219 psi | 63% | 2805 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 92% | 43,120 psi | 68% | 2894 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 47,558 psi | 75% | 2890 fps | 97.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,007 psi | 74% | 2910 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,372 psi | 81% | 2940 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,745 psi | 42% | 1722 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,345 psi | 84% | 2976 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 44,701 psi | 70% | 2841 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,526 psi | 68% | 2920 fps | 98.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,346 psi | 55% | 2769 fps | 99.2% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 38,159 psi | 60% | 2808 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 41,046 psi | 64% | 2884 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 48,443 psi | 76% | 2874 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,351 psi | 66% | 2776 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 80% | 35,839 psi | 56% | 2684 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 90% | 47,152 psi | 74% | 2881 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 86% | 40,176 psi | 63% | 2746 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,860 psi | 70% | 2858 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,582 psi | 64% | 2759 fps | 99% |
| Shooters World SW4350 | <<locked>> | 92% | 46,035 psi | 72% | 2887 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,796 psi | 58% | 2733 fps | 96.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,934 psi | 72% | 2864 fps | 97.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,034 psi | 69% | 2844 fps | 98.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,774 psi | 72% | 2779 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,189 psi | 60% | 2635 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 45,223 psi | 71% | 2802 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 51,677 psi | 81% | 2972 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,498 psi | 71% | 2782 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,658 psi | 72% | 2861 fps | 98.9% |
| Somchem S355 | <<locked>> | 80% | 36,608 psi | 57% | 2690 fps | 97.5% |
| Somchem S365 | <<locked>> | 82% | 28,471 psi | 45% | 2562 fps | 95.7% |
| Unknown powder | <<locked>> | 86% | 39,334 psi | 62% | 2795 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 50,604 psi | 79% | 2831 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,120 psi | 68% | 2723 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,887 psi | 66% | 2759 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,916 psi | 66% | 2759 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,270 psi | 49% | 2533 fps | 97.1% |
| Vihtavuori N160 | <<locked>> | 84% | 36,883 psi | 58% | 2710 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 50,140 psi | 79% | 2946 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,669 psi | 65% | 2779 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 37,434 psi | 59% | 2759 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 92% | 33,649 psi | 53% | 2720 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,980 psi | 49% | 2536 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 51,372 psi | 81% | 2999 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 44,976 psi | 70% | 2927 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 96% | 31,473 psi | 49% | 2720 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 97 powders for .300 WSM loaded with the .308 | 150gr | Speer TBBC. Alliant Reloder-17 delivers the highest muzzle velocity at 3,202 fps; across all powders the maximum-charge window runs from 1,883 fps to 3,202 fps. Alliant Reloder-16 gives the best case fill at 100 %, and 97 of the 97 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 1:14.5 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 | Speer TBBC 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.