Load Specifications
Load data in caliber .300 WSM with .308 | 165gr | Frontier BTSP 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, 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% | 55,825 psi | 87% | 2792 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,737 psi | 86% | 2815 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,853 psi | 86% | 2871 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 54,853 psi | 86% | 2822 fps | 97% |
| Accurate 3100ᴾ | <<locked>> | 100% | 41,843 psi | 66% | 2707 fps | 96.1% |
| Accurate 4064 | <<locked>> | 90% | 54,665 psi | 86% | 2864 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,607 psi | 86% | 2949 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 86% | 54,940 psi | 86% | 2894 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 55,941 psi | 88% | 2894 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,406 psi | 90% | 2894 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,897 psi | 86% | 2818 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,737 psi | 86% | 3015 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,115 psi | 88% | 2917 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,753 psi | 89% | 2940 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,680 psi | 87% | 3005 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 96% | 57,145 psi | 90% | 3045 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,943 psi | 63% | 2740 fps | 98.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,802 psi | 70% | 2904 fps | 98.3% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,853 psi | 86% | 2910 fps | 99.7% |
| Bofors RP3 | <<locked>> | 92% | 56,884 psi | 89% | 2936 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,869 psi | 89% | 2904 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,840 psi | 88% | 2828 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 57,043 psi | 89% | 2927 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,317 psi | 87% | 2972 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 84% | 57,508 psi | 90% | 2877 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 57,740 psi | 90% | 2946 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 94% | 55,361 psi | 87% | 2969 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 98% | 55,825 psi | 87% | 2927 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 86% | 55,492 psi | 87% | 2904 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,996 psi | 81% | 2877 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,027 psi | 86% | 2940 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,404 psi | 85% | 2982 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,592 psi | 56% | 1768 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,608 psi | 87% | 2890 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 54,230 psi | 85% | 2867 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 54,694 psi | 86% | 2864 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 94% | 57,508 psi | 90% | 2887 fps | 98.2% |
| IMR 4350ᴾ | <<locked>> | 100% | 57,043 psi | 89% | 2927 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,201 psi | 87% | 2881 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,037 psi | 77% | 2844 fps | 99.1% |
| IMR 4895 | <<locked>> | 88% | 54,563 psi | 86% | 2917 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 57,406 psi | 90% | 2894 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,853 psi | 86% | 2871 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,665 psi | 86% | 2825 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 55,361 psi | 87% | 2874 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,665 psi | 86% | 2877 fps | 98.9% |
| Lovex S070 | <<locked>> | 98% | 55,564 psi | 87% | 2910 fps | 98.2% |
| Norma 201 | <<locked>> | 88% | 57,276 psi | 90% | 2890 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,201 psi | 85% | 2838 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,927 psi | 88% | 2927 fps | 100% |
| Norma 204 | <<locked>> | 98% | 54,114 psi | 85% | 2920 fps | 95.9% |
| Norma URPᴾ | <<locked>> | 100% | 57,232 psi | 90% | 2989 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 90% | 56,507 psi | 89% | 2953 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,115 psi | 88% | 2989 fps | 98.8% |
| Ramshot TAC | <<locked>> | 84% | 54,346 psi | 85% | 2864 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 86% | 57,609 psi | 90% | 2936 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,766 psi | 86% | 2844 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,056 psi | 56% | 1811 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,898 psi | 89% | 2874 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,491 psi | 85% | 2874 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 57,290 psi | 90% | 3009 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,985 psi | 89% | 3045 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,273 psi | 85% | 2972 fps | 99.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 57,580 psi | 90% | 3054 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 84% | 54,882 psi | 86% | 2822 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 57,667 psi | 90% | 2887 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,739 psi | 89% | 2927 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,869 psi | 89% | 2904 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,665 psi | 86% | 2877 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,853 psi | 86% | 2871 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,361 psi | 87% | 2874 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,564 psi | 87% | 2910 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,911 psi | 86% | 2936 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,304 psi | 88% | 2894 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,855 psi | 89% | 2917 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,376 psi | 87% | 2782 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,593 psi | 87% | 2779 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,042 psi | 86% | 2828 fps | 97.8% |
| Somchem S321 | <<locked>> | 82% | 55,288 psi | 87% | 2877 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,824 psi | 86% | 2779 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,927 psi | 88% | 2887 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 56,797 psi | 89% | 2920 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,474 psi | 81% | 2936 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,022 psi | 75% | 2815 fps | 95.9% |
| Unknown powder | <<locked>> | 96% | 54,549 psi | 85% | 2943 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 84% | 57,276 psi | 90% | 2772 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,042 psi | 86% | 2762 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 57,638 psi | 90% | 2851 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 57,609 psi | 90% | 2858 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 54,868 psi | 86% | 2854 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 55,259 psi | 87% | 2917 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 57,363 psi | 90% | 2904 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 57,217 psi | 90% | 2887 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 55,608 psi | 87% | 2966 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,787 psi | 69% | 2815 fps | 98.8% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,608 psi | 89% | 2913 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,085 psi | 86% | 2904 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,361 psi | 87% | 2969 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,853 psi | 56% | 2743 fps | 98.9% |
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% | 2700 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,177 psi | 66% | 2625 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,790 psi | 75% | 2766 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 48,283 psi | 76% | 2713 fps | 95.6% |
| Accurate 3100 | <<locked>> | 98% | 39,001 psi | 61% | 2651 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 39,900 psi | 63% | 2621 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,663 psi | 53% | 2549 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 45,556 psi | 71% | 2736 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 38,725 psi | 61% | 2582 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,616 psi | 75% | 2743 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 48,298 psi | 76% | 2730 fps | 100% |
| Alliant Power Pro 2000-MR | 54.3 gr | 80% | 41,437 psi | 65% | 2766 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,508 psi | 60% | 2608 fps | 98.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,263 psi | 65% | 2671 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,924 psi | 53% | 2562 fps | 95.4% |
| Alliant Reloder-17 | 53.5 gr | 80% | 33,199 psi | 52% | 2572 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,212 psi | 49% | 2520 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 94% | 36,114 psi | 57% | 2700 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,831 psi | 70% | 2740 fps | 98.5% |
| Bofors RP3 | <<locked>> | 80% | 38,232 psi | 60% | 2612 fps | 98.8% |
| Bofors RP7 | <<locked>> | 90% | 47,094 psi | 74% | 2740 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,255 psi | 77% | 2730 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,528 psi | 73% | 2766 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,547 psi | 81% | 2917 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 80% | 50,604 psi | 79% | 2779 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,914 psi | 61% | 2612 fps | 96.4% |
| Hodgdon H414 | <<locked>> | 86% | 42,119 psi | 66% | 2730 fps | 95% |
| Hodgdon H4350 | <<locked>> | 94% | 49,342 psi | 77% | 2818 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 45,963 psi | 72% | 2746 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,196 psi | 46% | 2405 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,581 psi | 62% | 2667 fps | 99.1% |
| Hodgdon Superformance | 65 gr | 92% | 46,992 psi | 74% | 2848 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,498 psi | 42% | 1581 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,988 psi | 64% | 2638 fps | 99% |
| IMR 3031 | <<locked>> | 80% | 42,003 psi | 66% | 2674 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,058 psi | 60% | 2559 fps | 97.5% |
| IMR 4166 Enduron | <<locked>> | 84% | 42,728 psi | 67% | 2631 fps | 95.1% |
| IMR 4350 | <<locked>> | 92% | 44,570 psi | 70% | 2717 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,294 psi | 68% | 2671 fps | 95.1% |
| IMR 4831 | <<locked>> | 88% | 33,460 psi | 52% | 2526 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 42,235 psi | 66% | 2700 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 47,616 psi | 75% | 2743 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 44,947 psi | 70% | 2717 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,411 psi | 71% | 2671 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 40,625 psi | 64% | 2621 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 37,869 psi | 59% | 2562 fps | 95.1% |
| Lovex S070 | <<locked>> | 90% | 43,410 psi | 68% | 2700 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 44,628 psi | 70% | 2687 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 45,005 psi | 71% | 2694 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,654 psi | 64% | 2661 fps | 98.6% |
| Norma 204 | <<locked>> | 96% | 50,633 psi | 79% | 2864 fps | 95.1% |
| Norma URP | <<locked>> | 84% | 33,968 psi | 53% | 2549 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 40,176 psi | 63% | 2671 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 40,408 psi | 63% | 2703 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 47,558 psi | 75% | 2749 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,166 psi | 74% | 2772 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,503 psi | 81% | 2792 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,803 psi | 42% | 1617 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,359 psi | 84% | 2825 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,018 psi | 66% | 2651 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,642 psi | 68% | 2779 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,317 psi | 55% | 2641 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 35,810 psi | 56% | 2625 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 38,334 psi | 60% | 2690 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 48,747 psi | 76% | 2730 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,569 psi | 67% | 2641 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 35,969 psi | 56% | 2556 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 90% | 47,094 psi | 74% | 2740 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,869 psi | 59% | 2562 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,947 psi | 70% | 2717 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,625 psi | 64% | 2621 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 43,410 psi | 68% | 2700 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,883 psi | 58% | 2605 fps | 97.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,905 psi | 72% | 2723 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,106 psi | 69% | 2707 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,832 psi | 72% | 2638 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,218 psi | 60% | 2503 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 42,250 psi | 66% | 2612 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 51,634 psi | 81% | 2825 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,571 psi | 71% | 2638 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,658 psi | 72% | 2723 fps | 99.3% |
| Somchem S355 | <<locked>> | 80% | 36,695 psi | 57% | 2559 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 26,658 psi | 42% | 2385 fps | 95.6% |
| Somchem S385 | <<locked>> | 98% | 44,918 psi | 70% | 2759 fps | 95.1% |
| Unknown powder | <<locked>> | 84% | 36,941 psi | 58% | 2608 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 50,850 psi | 80% | 2684 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,381 psi | 68% | 2585 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,974 psi | 66% | 2618 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,032 psi | 66% | 2621 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,314 psi | 49% | 2411 fps | 97.8% |
| Vihtavuori N160 | <<locked>> | 82% | 34,606 psi | 54% | 2530 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 50,241 psi | 79% | 2795 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,742 psi | 65% | 2641 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 35,012 psi | 55% | 2569 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 90% | 31,604 psi | 50% | 2543 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,951 psi | 49% | 2418 fps | 96.3% |
| Winchester 748 | <<locked>> | 80% | 51,372 psi | 81% | 2848 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 42,119 psi | 66% | 2730 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,472 psi | 46% | 2539 fps | 95.5% |
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 | 165gr | Frontier BTSP. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,054 fps; across all powders the maximum-charge window runs from 1,768 fps to 3,054 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 54–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-16 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 | 165gr | Frontier BTSP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2209, Alliant Reloder-19, Alliant Reloder-22 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.