Load Specifications
Load data in caliber .300 WSM with .308 | 150gr | Berger Target FB 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 Power Pro 2000-MR, ReloadSwiss RS 60 and Hodgdon Superformance.
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% | 55,405 psi | 87% | 2936 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 57,435 psi | 90% | 3012 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,201 psi | 85% | 2959 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,985 psi | 88% | 3028 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,913 psi | 89% | 3005 fps | 96.8% |
| Accurate 4064 | <<locked>> | 90% | 54,433 psi | 85% | 3012 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,041 psi | 85% | 3084 fps | 99.3% |
| ADI AR 2206H | <<locked>> | 86% | 54,694 psi | 86% | 3041 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 92% | 55,608 psi | 87% | 3035 fps | 99.6% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,145 psi | 90% | 3045 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,259 psi | 85% | 2966 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,186 psi | 85% | 3156 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,622 psi | 87% | 3061 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,304 psi | 88% | 3084 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,274 psi | 87% | 3150 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 96% | 56,884 psi | 89% | 3189 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,595 psi | 62% | 2858 fps | 98.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,440 psi | 70% | 3028 fps | 97.6% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,433 psi | 85% | 3051 fps | 99.4% |
| Bofors RP3 | <<locked>> | 92% | 56,362 psi | 88% | 3077 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,550 psi | 89% | 3045 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,172 psi | 86% | 2969 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,739 psi | 89% | 3074 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,882 psi | 86% | 3120 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 82% | 57,711 psi | 90% | 3035 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 57,406 psi | 90% | 3091 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 98% | 57,159 psi | 90% | 3143 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 96% | 57,667 psi | 90% | 3104 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 86% | 55,230 psi | 87% | 3051 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,619 psi | 81% | 3018 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,679 psi | 86% | 3081 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,143 psi | 85% | 3117 fps | 96.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,462 psi | 56% | 1880 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,333 psi | 88% | 3051 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,129 psi | 86% | 3035 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,158 psi | 86% | 3022 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,100 psi | 86% | 2995 fps | 97.3% |
| IMR 4350ᴾ | <<locked>> | 100% | 56,710 psi | 89% | 3068 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,795 psi | 86% | 3018 fps | 97.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,534 psi | 85% | 3077 fps | 99.4% |
| IMR 4895 | <<locked>> | 88% | 54,085 psi | 85% | 3061 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 86% | 57,145 psi | 90% | 3045 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 57,464 psi | 90% | 3025 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,288 psi | 85% | 3012 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 57,493 psi | 90% | 3015 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 54,897 psi | 86% | 3015 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,172 psi | 85% | 3012 fps | 98.3% |
| Lovex S070 | <<locked>> | 98% | 55,216 psi | 87% | 3048 fps | 97.6% |
| Norma 201 | <<locked>> | 88% | 56,724 psi | 89% | 3035 fps | 100% |
| Norma 202 | <<locked>> | 88% | 57,232 psi | 90% | 3035 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,506 psi | 87% | 3071 fps | 99.9% |
| Norma 204ᴾ | <<locked>> | 100% | 57,696 psi | 90% | 3120 fps | 96% |
| Norma URPᴾ | <<locked>> | 100% | 56,579 psi | 89% | 3127 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 90% | 56,217 psi | 88% | 3097 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,593 psi | 87% | 3123 fps | 98.3% |
| Ramshot TAC | <<locked>> | 86% | 57,421 psi | 90% | 3058 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 86% | 57,232 psi | 90% | 3081 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,404 psi | 85% | 2986 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,839 psi | 56% | 1923 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,362 psi | 88% | 3018 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,983 psi | 85% | 3012 fps | 97.7% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 56,956 psi | 89% | 3156 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,391 psi | 88% | 3189 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 57,624 psi | 90% | 3169 fps | 99.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 57,305 psi | 90% | 3199 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 86% | 57,566 psi | 90% | 3015 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 57,334 psi | 90% | 3035 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,217 psi | 88% | 3068 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,550 psi | 89% | 3045 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,172 psi | 85% | 3012 fps | 98.3% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,288 psi | 85% | 3012 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,897 psi | 86% | 3015 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,216 psi | 87% | 3048 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,476 psi | 85% | 3074 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,941 psi | 88% | 3038 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,608 psi | 89% | 3061 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,853 psi | 86% | 2923 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,955 psi | 86% | 2917 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,621 psi | 86% | 2963 fps | 97.2% |
| Somchem S321 | <<locked>> | 82% | 54,795 psi | 86% | 3022 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 57,551 psi | 90% | 2966 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,477 psi | 87% | 3028 fps | 99.8% |
| Somchem S355 | <<locked>> | 94% | 56,434 psi | 88% | 3064 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,010 psi | 80% | 3077 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 54,520 psi | 85% | 2884 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,100 psi | 86% | 2910 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 57,145 psi | 90% | 2995 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,520 psi | 85% | 2966 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,447 psi | 85% | 2989 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,651 psi | 87% | 3071 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 86% | 57,711 psi | 90% | 3041 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,130 psi | 88% | 3009 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 54,824 psi | 86% | 3077 fps | 99.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,308 psi | 68% | 2940 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,173 psi | 88% | 3051 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,056 psi | 85% | 3038 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 57,159 psi | 90% | 3143 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,491 psi | 56% | 2851 fps | 97.9% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,623 psi | 89% | 3071 fps | 100% |
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% | 48,921 psi | 77% | 2838 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 53,795 psi | 84% | 2963 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,727 psi | 65% | 2756 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,747 psi | 76% | 2917 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 49,980 psi | 78% | 2890 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 39,450 psi | 62% | 2746 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 35,679 psi | 56% | 2723 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 45,194 psi | 71% | 2871 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 80% | 38,435 psi | 60% | 2707 fps | 96.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,239 psi | 74% | 2881 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 47,616 psi | 75% | 2867 fps | 100% |
| Alliant Power Pro 2000-MR | 57.9 gr | 80% | 41,089 psi | 64% | 2894 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,058 psi | 60% | 2730 fps | 98.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,915 psi | 64% | 2799 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 35,607 psi | 56% | 2733 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,808 psi | 51% | 2684 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 32,851 psi | 51% | 2684 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 38,595 psi | 60% | 2887 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,411 psi | 70% | 2871 fps | 97.9% |
| Bofors RP3 | <<locked>> | 80% | 37,797 psi | 59% | 2736 fps | 98.2% |
| Bofors RP7 | <<locked>> | 92% | 49,821 psi | 78% | 2930 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,037 psi | 77% | 2871 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,151 psi | 72% | 2900 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,082 psi | 80% | 3054 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 80% | 53,954 psi | 85% | 2979 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,653 psi | 61% | 2736 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 92% | 46,731 psi | 73% | 2959 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 92% | 50,618 psi | 79% | 2982 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 45,629 psi | 72% | 2881 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 30,690 psi | 48% | 2566 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,582 psi | 65% | 2848 fps | 99% |
| Hodgdon Superformance | 70.8 gr | 94% | 50,169 psi | 79% | 3041 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,353 psi | 41% | 1680 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,700 psi | 68% | 2828 fps | 99% |
| IMR 3031 | <<locked>> | 80% | 45,368 psi | 71% | 2881 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,306 psi | 63% | 2743 fps | 97.5% |
| IMR 4166 Enduron | <<locked>> | 82% | 45,658 psi | 72% | 2825 fps | 95.2% |
| IMR 4350 | <<locked>> | 96% | 50,009 psi | 78% | 2953 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 45,629 psi | 72% | 2851 fps | 95% |
| IMR 4831 | <<locked>> | 88% | 36,738 psi | 58% | 2733 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 41,901 psi | 66% | 2831 fps | 98.3% |
| IMR 8208 XBR | <<locked>> | 80% | 47,239 psi | 74% | 2881 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 53,534 psi | 84% | 2969 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,324 psi | 69% | 2848 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,092 psi | 71% | 2805 fps | 98.9% |
| Lovex S062 | <<locked>> | 80% | 40,263 psi | 63% | 2749 fps | 98.9% |
| Lovex S065 | <<locked>> | 86% | 39,900 psi | 63% | 2736 fps | 95% |
| Lovex S070 | <<locked>> | 92% | 45,847 psi | 72% | 2881 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 44,222 psi | 69% | 2818 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 44,585 psi | 70% | 2831 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,277 psi | 63% | 2785 fps | 97.9% |
| Norma 204 | <<locked>> | 98% | 53,838 psi | 84% | 3058 fps | 95.1% |
| Norma URP | <<locked>> | 86% | 35,795 psi | 56% | 2720 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 39,755 psi | 62% | 2795 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 92% | 42,728 psi | 67% | 2884 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 47,108 psi | 74% | 2881 fps | 97.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,702 psi | 73% | 2904 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,865 psi | 80% | 2927 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,774 psi | 42% | 1722 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,779 psi | 83% | 2966 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 44,469 psi | 70% | 2835 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,149 psi | 68% | 2907 fps | 98% |
| ReloadSwiss RS 60 | 57 gr | 80% | 34,925 psi | 55% | 2756 fps | 99% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 37,913 psi | 59% | 2799 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 40,698 psi | 64% | 2871 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 48,283 psi | 76% | 2867 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,018 psi | 66% | 2766 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 35,534 psi | 56% | 2674 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 92% | 49,821 psi | 78% | 2930 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 39,900 psi | 63% | 2736 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,324 psi | 69% | 2848 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,263 psi | 63% | 2749 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 92% | 45,847 psi | 72% | 2881 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,550 psi | 57% | 2726 fps | 96.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,455 psi | 71% | 2854 fps | 97.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,772 psi | 69% | 2838 fps | 98.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,455 psi | 71% | 2772 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,869 psi | 59% | 2628 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 44,817 psi | 70% | 2789 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 51,184 psi | 80% | 2963 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,179 psi | 71% | 2772 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,194 psi | 71% | 2851 fps | 98.8% |
| Somchem S355 | <<locked>> | 80% | 36,318 psi | 57% | 2680 fps | 97.3% |
| Somchem S365 | <<locked>> | 82% | 28,094 psi | 44% | 2546 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 51,256 psi | 80% | 2838 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,803 psi | 72% | 2766 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,510 psi | 65% | 2753 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,206 psi | 66% | 2759 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,548 psi | 54% | 2615 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 37,536 psi | 59% | 2730 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 47,398 psi | 74% | 2874 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 40,741 psi | 64% | 2749 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 36,854 psi | 58% | 2726 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 92% | 33,257 psi | 52% | 2707 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,632 psi | 48% | 2526 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 47,050 psi | 74% | 2920 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 46,731 psi | 73% | 2959 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 96% | 31,183 psi | 49% | 2707 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,120 psi | 68% | 2838 fps | 99% |
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 99 powders for .300 WSM loaded with the .308 | 150gr | Berger Target FB. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,199 fps; across all powders the maximum-charge window runs from 1,880 fps to 3,199 fps. Alliant Reloder-16 gives the best case fill at 100 %, and 99 of the 99 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 1:14.0 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, ReloadSwiss RS 60, Hodgdon Superformance rank at the top here: for .300 WSM with the .308 | 150gr | Berger Target FB 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.