Load Specifications
Bullet Manufacturer:Speer
Bullet Weight:170 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Caliber:.300 WSM load data
Case Length (l3):2.09"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:81.3 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:14.5
Load data in caliber .300 WSM with .308 | 170gr | Speer Deep Curl Flat Points bullet and 104 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-17 and ReloadSwiss RS 60.
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>> | 82% | 56,434 psi | 88% | 2772 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 55,999 psi | 88% | 2805 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 55,825 psi | 87% | 2858 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 55,825 psi | 87% | 2858 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 55,506 psi | 87% | 2818 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,673 psi | 73% | 2776 fps | 98% |
| Accurate 4064 | <<locked>> | 88% | 56,101 psi | 88% | 2854 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 56,376 psi | 88% | 2953 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 55,724 psi | 87% | 2884 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 56,884 psi | 89% | 2890 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,288 psi | 85% | 2933 fps | 96.9% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,447 psi | 85% | 2831 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 55,854 psi | 88% | 2802 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,637 psi | 87% | 3009 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 53,867 psi | 84% | 2927 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 57,319 psi | 90% | 2910 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 57,682 psi | 90% | 2933 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 57,043 psi | 89% | 3005 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,984 psi | 86% | 2989 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,055 psi | 83% | 2917 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,947 psi | 69% | 2802 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,783 psi | 61% | 2703 fps | 96.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,937 psi | 78% | 2986 fps | 99.6% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,593 psi | 87% | 2900 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 54,578 psi | 86% | 2877 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 57,740 psi | 90% | 2904 fps | 98.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,970 psi | 88% | 2812 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,288 psi | 85% | 2864 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,158 psi | 86% | 2890 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 56,753 psi | 89% | 2972 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 96% | 57,101 psi | 89% | 2933 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 84% | 56,333 psi | 88% | 2894 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 57,246 psi | 90% | 2927 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,376 psi | 88% | 2933 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 55,651 psi | 87% | 2986 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,984 psi | 56% | 1772 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,507 psi | 89% | 2881 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,405 psi | 87% | 2854 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,622 psi | 87% | 2861 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 54,795 psi | 86% | 2835 fps | 98.4% |
| IMR 4350 | <<locked>> | 96% | 54,882 psi | 86% | 2881 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,115 psi | 88% | 2881 fps | 98.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,983 psi | 85% | 2900 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 55,709 psi | 87% | 2913 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,447 psi | 85% | 2831 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,825 psi | 87% | 2858 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,013 psi | 86% | 2812 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 56,362 psi | 88% | 2864 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,767 psi | 87% | 2877 fps | 99.4% |
| Lovex S070 | <<locked>> | 96% | 56,768 psi | 89% | 2913 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 38,682 psi | 61% | 2621 fps | 95.9% |
| Norma 201 | <<locked>> | 84% | 54,592 psi | 86% | 2831 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,158 psi | 86% | 2828 fps | 100% |
| Norma 203B | <<locked>> | 88% | 56,913 psi | 89% | 2920 fps | 100% |
| Norma 204 | <<locked>> | 96% | 55,347 psi | 87% | 2930 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 49,487 psi | 78% | 2936 fps | 97.7% |
| Norma URP | <<locked>> | 96% | 55,114 psi | 86% | 2936 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 53,853 psi | 84% | 2890 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 57,566 psi | 90% | 2989 fps | 99.4% |
| Ramshot TAC | <<locked>> | 82% | 54,665 psi | 86% | 2854 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,462 psi | 85% | 2867 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,463 psi | 57% | 1814 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,245 psi | 87% | 2874 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,955 psi | 86% | 2949 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,404 psi | 85% | 2979 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 56,115 psi | 88% | 2976 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,955 psi | 86% | 2999 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 82% | 55,463 psi | 87% | 2808 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,201 psi | 87% | 2831 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,462 psi | 85% | 2871 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 56,028 psi | 88% | 2904 fps | 96.1% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,083 psi | 82% | 2900 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 94% | 57,740 psi | 90% | 2904 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,767 psi | 87% | 2877 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,825 psi | 87% | 2858 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,362 psi | 88% | 2864 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 56,768 psi | 89% | 2913 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,956 psi | 88% | 2927 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 56,971 psi | 89% | 2887 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 57,624 psi | 90% | 2907 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,637 psi | 87% | 2762 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,028 psi | 88% | 2762 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,753 psi | 87% | 2828 fps | 98.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,590 psi | 81% | 2894 fps | 96.7% |
| Somchem S335 | <<locked>> | 84% | 55,274 psi | 87% | 2762 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 56,594 psi | 89% | 2877 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 54,505 psi | 85% | 2864 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 57,566 psi | 90% | 2992 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,968 psi | 83% | 2881 fps | 97.7% |
| Unknown powder | <<locked>> | 94% | 56,130 psi | 88% | 2946 fps | 99.7% |
| Vihtavuori N130 | <<locked>> | 82% | 57,435 psi | 90% | 2753 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,419 psi | 87% | 2743 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,143 psi | 86% | 2792 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 54,839 psi | 86% | 2799 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,869 psi | 88% | 2844 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,681 psi | 89% | 2913 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 82% | 57,580 psi | 90% | 2884 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,607 psi | 86% | 2825 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 56,797 psi | 89% | 2959 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,066 psi | 77% | 2881 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 57,740 psi | 90% | 2907 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,753 psi | 89% | 2972 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,552 psi | 62% | 2831 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,245 psi | 87% | 2904 fps | 97.1% |
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% | 53,040 psi | 83% | 2726 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,079 psi | 72% | 2661 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,982 psi | 81% | 2805 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,982 psi | 81% | 2805 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 42,859 psi | 67% | 2602 fps | 95.1% |
| Accurate 3100 | <<locked>> | 94% | 38,087 psi | 60% | 2608 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 43,584 psi | 68% | 2661 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,489 psi | 51% | 2497 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 49,153 psi | 77% | 2779 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 41,771 psi | 65% | 2628 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 96% | 47,645 psi | 75% | 2815 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,271 psi | 80% | 2782 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,344 psi | 82% | 2756 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,165 psi | 71% | 2825 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 47,369 psi | 74% | 2812 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,800 psi | 66% | 2654 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,788 psi | 70% | 2720 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,489 psi | 51% | 2510 fps | 95.7% |
| Alliant Reloder-17 | 56.7 gr | 80% | 36,230 psi | 57% | 2635 fps | 98.7% |
| Alliant Reloder-19 | <<locked>> | 96% | 46,760 psi | 73% | 2802 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,427 psi | 45% | 2418 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 98% | 36,361 psi | 57% | 2644 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 90% | 34,896 psi | 55% | 2657 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,646 psi | 76% | 2789 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 41,814 psi | 66% | 2661 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 42,177 psi | 66% | 2631 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,765 psi | 83% | 2766 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,633 psi | 79% | 2808 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,438 psi | 67% | 2667 fps | 98% |
| Hodgdon H414 | <<locked>> | 82% | 40,205 psi | 63% | 2674 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 88% | 44,570 psi | 70% | 2717 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 49,676 psi | 78% | 2792 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,863 psi | 47% | 2405 fps | 96.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,366 psi | 68% | 2720 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 86% | 41,785 psi | 65% | 2733 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,760 psi | 42% | 1581 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,005 psi | 69% | 2677 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 45,832 psi | 72% | 2710 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,031 psi | 64% | 2605 fps | 98.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 40,567 psi | 64% | 2572 fps | 95.3% |
| IMR 4350 | <<locked>> | 88% | 42,699 psi | 67% | 2664 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,220 psi | 65% | 2612 fps | 95.4% |
| IMR 4831 | <<locked>> | 84% | 32,532 psi | 51% | 2480 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 45,905 psi | 72% | 2749 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 51,271 psi | 80% | 2782 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,805 psi | 76% | 2756 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,573 psi | 76% | 2710 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 43,932 psi | 69% | 2664 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 36,187 psi | 57% | 2507 fps | 95.4% |
| Lovex S070 | <<locked>> | 84% | 39,131 psi | 61% | 2592 fps | 95.1% |
| Lovex S071 | <<locked>> | 98% | 36,361 psi | 57% | 2572 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 48,109 psi | 75% | 2726 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,559 psi | 76% | 2730 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,135 psi | 69% | 2707 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 48,327 psi | 76% | 2812 fps | 95.4% |
| Norma MRP | <<locked>> | 96% | 43,047 psi | 67% | 2808 fps | 96% |
| Norma URP | <<locked>> | 80% | 32,663 psi | 51% | 2497 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 43,947 psi | 69% | 2723 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 38,638 psi | 61% | 2648 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 51,140 psi | 80% | 2795 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,024 psi | 80% | 2815 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,267 psi | 43% | 1624 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,641 psi | 67% | 2648 fps | 96.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,863 psi | 75% | 2835 fps | 99.6% |
| ReloadSwiss RS 60 | 56.7 gr | 80% | 38,551 psi | 60% | 2697 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,184 psi | 50% | 2510 fps | 95% |
| ReloadSwiss RS 70 | 59.1 gr | 82% | 34,214 psi | 54% | 2572 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 52,257 psi | 82% | 2759 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,934 psi | 72% | 2680 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,291 psi | 62% | 2605 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 98% | 52,417 psi | 82% | 2844 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 96% | 45,571 psi | 71% | 2785 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 84% | 42,177 psi | 66% | 2631 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,187 psi | 57% | 2507 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,805 psi | 76% | 2756 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,932 psi | 69% | 2664 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 39,131 psi | 61% | 2592 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,379 psi | 63% | 2657 fps | 98.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,748 psi | 78% | 2776 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,718 psi | 75% | 2753 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,298 psi | 77% | 2671 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,365 psi | 65% | 2539 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,321 psi | 63% | 2559 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 45,136 psi | 71% | 2779 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 48,849 psi | 77% | 2671 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,487 psi | 78% | 2766 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 39,900 psi | 63% | 2608 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 29,327 psi | 46% | 2451 fps | 97.8% |
| Somchem S385 | <<locked>> | 94% | 43,497 psi | 68% | 2717 fps | 95.6% |
| Unknown powder | <<locked>> | 80% | 35,375 psi | 55% | 2552 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 54,288 psi | 85% | 2710 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,470 psi | 73% | 2612 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,774 psi | 72% | 2654 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,368 psi | 71% | 2654 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,113 psi | 53% | 2461 fps | 99% |
| Vihtavuori N160 | <<locked>> | 80% | 35,389 psi | 55% | 2530 fps | 96.5% |
| Vihtavuori N530 | <<locked>> | 80% | 54,114 psi | 85% | 2835 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,165 psi | 71% | 2677 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,027 psi | 56% | 2572 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 86% | 30,835 psi | 48% | 2497 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,547 psi | 53% | 2474 fps | 98.1% |
| Winchester 760 | <<locked>> | 82% | 40,205 psi | 63% | 2674 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,471 psi | 45% | 2500 fps | 96.2% |
| Winchester Supreme 780 | <<locked>> | 96% | 47,674 psi | 75% | 2782 fps | 95.4% |
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 104 powders for .300 WSM loaded with the .308 | 170gr | Speer Deep Curl Flat Points. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,009 fps; across all powders the maximum-charge window runs from 1,772 fps to 3,009 fps. Accurate 3100 gives the best case fill at 100 %, and 104 of the 104 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 170.0 gr projectile in 0.308" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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. ReloadSwiss RS 70, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .300 WSM with the .308 | 170gr | Speer Deep Curl Flat Points 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.