Load Specifications
Bullet Manufacturer:Winchester
Bullet Weight:180 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:1:13.0
Load data in caliber .300 WSM with .308 | 180gr | Winchester FailSafe bullet and 106 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% | 57,058 psi | 89% | 2694 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 56,782 psi | 89% | 2726 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 56,405 psi | 88% | 2779 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 56,405 psi | 88% | 2779 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,188 psi | 88% | 2746 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,500 psi | 74% | 2713 fps | 98.5% |
| Accurate 4064 | <<locked>> | 88% | 56,710 psi | 89% | 2776 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 57,058 psi | 89% | 2877 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 56,420 psi | 88% | 2805 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 57,464 psi | 90% | 2808 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,781 psi | 86% | 2858 fps | 97.4% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,230 psi | 87% | 2753 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,608 psi | 89% | 2720 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 56,565 psi | 89% | 2933 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 57,740 psi | 90% | 2828 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,853 psi | 86% | 2805 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,331 psi | 85% | 2877 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,680 psi | 87% | 2910 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,896 psi | 84% | 2848 fps | 97.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 47,442 psi | 74% | 2785 fps | 96.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,541 psi | 70% | 2733 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,189 psi | 61% | 2641 fps | 97.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,705 psi | 79% | 2913 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,347 psi | 88% | 2825 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 55,056 psi | 86% | 2795 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 47,442 psi | 74% | 2785 fps | 96.2% |
| Bofors RP7 | <<locked>> | 92% | 54,853 psi | 86% | 2776 fps | 98.3% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,681 psi | 89% | 2733 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,897 psi | 86% | 2785 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,622 psi | 87% | 2812 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 57,493 psi | 90% | 2897 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 94% | 54,346 psi | 85% | 2808 fps | 97.7% |
| Hodgdon H4895 | <<locked>> | 84% | 57,014 psi | 89% | 2815 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,534 psi | 85% | 2805 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,942 psi | 89% | 2851 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,188 psi | 88% | 2913 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,114 psi | 57% | 1713 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,971 psi | 89% | 2802 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,912 psi | 88% | 2772 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,115 psi | 88% | 2779 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,274 psi | 87% | 2759 fps | 98.8% |
| IMR 4350 | <<locked>> | 96% | 55,419 psi | 87% | 2805 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,579 psi | 89% | 2805 fps | 98.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,621 psi | 86% | 2825 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 56,275 psi | 88% | 2831 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,230 psi | 87% | 2753 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,724 psi | 89% | 2782 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,492 psi | 87% | 2733 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 56,855 psi | 89% | 2785 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,347 psi | 88% | 2802 fps | 99.6% |
| Lovex S070 | <<locked>> | 96% | 57,319 psi | 90% | 2838 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,349 psi | 62% | 2562 fps | 96.6% |
| Norma 201 | <<locked>> | 84% | 55,143 psi | 86% | 2749 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,738 psi | 87% | 2749 fps | 100% |
| Norma 203B | <<locked>> | 88% | 57,595 psi | 90% | 2841 fps | 100% |
| Norma 204 | <<locked>> | 96% | 56,159 psi | 88% | 2858 fps | 97.6% |
| Norma MRPᴾ | <<locked>> | 100% | 50,024 psi | 78% | 2867 fps | 98.2% |
| Norma URP | <<locked>> | 96% | 55,709 psi | 87% | 2858 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 54,752 psi | 86% | 2815 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,388 psi | 84% | 2884 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 96% | 54,636 psi | 86% | 2861 fps | 99.4% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,282 psi | 73% | 2736 fps | 96.3% |
| Ramshot TAC | <<locked>> | 82% | 55,288 psi | 87% | 2779 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,071 psi | 86% | 2792 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,651 psi | 57% | 1752 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,825 psi | 87% | 2795 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,651 psi | 87% | 2871 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,216 psi | 87% | 2904 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 56,768 psi | 89% | 2897 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,680 psi | 87% | 2927 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 56,072 psi | 88% | 2726 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,796 psi | 87% | 2749 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,187 psi | 86% | 2792 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 56,521 psi | 89% | 2828 fps | 96.6% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,895 psi | 83% | 2831 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 92% | 54,853 psi | 86% | 2776 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,347 psi | 88% | 2802 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,724 psi | 89% | 2782 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,855 psi | 89% | 2785 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 57,319 psi | 90% | 2838 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 56,666 psi | 89% | 2851 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,998 psi | 85% | 2759 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,839 psi | 86% | 2779 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,231 psi | 88% | 2684 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,768 psi | 89% | 2684 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,449 psi | 88% | 2756 fps | 98.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,431 psi | 82% | 2825 fps | 97.3% |
| Somchem S335 | <<locked>> | 84% | 55,811 psi | 87% | 2684 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 57,421 psi | 90% | 2799 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,172 psi | 86% | 2789 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 54,447 psi | 85% | 2861 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,635 psi | 84% | 2812 fps | 98.2% |
| Unknown powder | <<locked>> | 94% | 56,637 psi | 89% | 2867 fps | 99.9% |
| Vihtavuori N133 | <<locked>> | 86% | 56,028 psi | 88% | 2661 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,695 psi | 87% | 2710 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,521 psi | 87% | 2720 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 56,681 psi | 89% | 2769 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 57,290 psi | 90% | 2838 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 44,396 psi | 70% | 2641 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 86% | 55,143 psi | 86% | 2746 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 57,682 psi | 90% | 2887 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,850 psi | 78% | 2808 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,375 psi | 85% | 2776 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,493 psi | 90% | 2897 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,132 psi | 63% | 2769 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,854 psi | 88% | 2831 fps | 97.6% |
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% | 53,780 psi | 84% | 2651 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,673 psi | 73% | 2585 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 52,678 psi | 83% | 2726 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 52,678 psi | 83% | 2726 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 43,279 psi | 68% | 2533 fps | 95.7% |
| Accurate 3100 | <<locked>> | 92% | 36,013 psi | 56% | 2490 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 44,164 psi | 69% | 2589 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,098 psi | 52% | 2438 fps | 96.4% |
| ADI AR 2206H | <<locked>> | 80% | 49,792 psi | 78% | 2707 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,206 psi | 66% | 2559 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 94% | 45,136 psi | 71% | 2690 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,895 psi | 81% | 2703 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,243 psi | 83% | 2677 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,876 psi | 72% | 2759 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,366 psi | 66% | 2585 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,397 psi | 71% | 2651 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,880 psi | 52% | 2448 fps | 96.5% |
| Alliant Reloder-17 | 54.9 gr | 80% | 36,782 psi | 58% | 2572 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 94% | 44,382 psi | 70% | 2680 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 98% | 44,237 psi | 69% | 2726 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,108 psi | 42% | 2313 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 96% | 34,635 psi | 54% | 2530 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 88% | 33,025 psi | 52% | 2536 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,110 psi | 77% | 2717 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 42,264 psi | 66% | 2592 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 44,237 psi | 69% | 2726 fps | 95.3% |
| Bofors RP7 | <<locked>> | 82% | 40,248 psi | 63% | 2516 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,330 psi | 84% | 2687 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,329 psi | 80% | 2733 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,931 psi | 67% | 2598 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 80% | 38,174 psi | 60% | 2552 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 88% | 45,034 psi | 71% | 2644 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 50,343 psi | 79% | 2717 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,429 psi | 48% | 2352 fps | 97.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,888 psi | 69% | 2648 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 42,221 psi | 66% | 2664 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,803 psi | 42% | 1526 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,686 psi | 70% | 2605 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 46,253 psi | 72% | 2631 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,597 psi | 65% | 2539 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 40,944 psi | 64% | 2503 fps | 95.9% |
| IMR 4350 | <<locked>> | 86% | 40,596 psi | 64% | 2546 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,088 psi | 61% | 2490 fps | 95.2% |
| IMR 4831 | <<locked>> | 82% | 30,995 psi | 49% | 2372 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 46,557 psi | 73% | 2677 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 80% | 51,895 psi | 81% | 2703 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,647 psi | 78% | 2684 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,037 psi | 77% | 2635 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 44,454 psi | 70% | 2592 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 36,637 psi | 57% | 2444 fps | 96.1% |
| Lovex S070 | <<locked>> | 82% | 37,202 psi | 58% | 2474 fps | 95% |
| Lovex S071 | <<locked>> | 96% | 34,577 psi | 54% | 2461 fps | 95% |
| Norma 201 | <<locked>> | 80% | 48,646 psi | 76% | 2651 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,153 psi | 77% | 2654 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,773 psi | 70% | 2638 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 45,745 psi | 72% | 2684 fps | 95.3% |
| Norma MRP | <<locked>> | 94% | 40,843 psi | 64% | 2687 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 33,185 psi | 52% | 2438 fps | 96.3% |
| Ramshot Big Game | <<locked>> | 80% | 44,643 psi | 70% | 2654 fps | 99.7% |
| Ramshot Grand | <<locked>> | 98% | 49,617 psi | 78% | 2818 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 84% | 36,796 psi | 58% | 2530 fps | 95.6% |
| Ramshot Magnum | <<locked>> | 98% | 42,989 psi | 67% | 2674 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 51,822 psi | 81% | 2726 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,503 psi | 81% | 2736 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,340 psi | 43% | 1565 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,163 psi | 68% | 2582 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,501 psi | 76% | 2759 fps | 99.8% |
| ReloadSwiss RS 60 | 54.9 gr | 80% | 39,131 psi | 61% | 2631 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,735 psi | 51% | 2451 fps | 95.8% |
| ReloadSwiss RS 70 | 57.2 gr | 82% | 34,635 psi | 54% | 2513 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 52,707 psi | 83% | 2680 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,427 psi | 73% | 2608 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,885 psi | 63% | 2539 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 49,690 psi | 78% | 2720 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 94% | 43,352 psi | 68% | 2664 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 82% | 40,248 psi | 63% | 2516 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,637 psi | 57% | 2444 fps | 96.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,647 psi | 78% | 2684 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,454 psi | 70% | 2592 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 37,202 psi | 58% | 2474 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,901 psi | 64% | 2592 fps | 99.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,444 psi | 79% | 2703 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,254 psi | 76% | 2677 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,705 psi | 78% | 2592 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,742 psi | 65% | 2467 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 38,319 psi | 60% | 2444 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 45,890 psi | 72% | 2713 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 49,356 psi | 77% | 2592 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,009 psi | 78% | 2690 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 40,408 psi | 63% | 2539 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 29,791 psi | 47% | 2395 fps | 98.4% |
| Somchem S385 | <<locked>> | 92% | 41,249 psi | 65% | 2595 fps | 95.4% |
| Unknown powder | <<locked>> | 80% | 35,955 psi | 56% | 2490 fps | 96.5% |
| Vihtavuori N133 | <<locked>> | 80% | 46,949 psi | 74% | 2536 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,238 psi | 72% | 2575 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,919 psi | 72% | 2582 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,606 psi | 54% | 2395 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 35,853 psi | 56% | 2464 fps | 97.1% |
| Vihtavuori N165 | <<locked>> | 98% | 41,611 psi | 65% | 2589 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 45,556 psi | 71% | 2602 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,463 psi | 57% | 2510 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 84% | 29,356 psi | 46% | 2385 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,910 psi | 53% | 2411 fps | 98.5% |
| Winchester 760 | <<locked>> | 80% | 38,174 psi | 60% | 2552 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,151 psi | 43% | 2392 fps | 96.1% |
| Winchester Supreme 780 | <<locked>> | 94% | 45,150 psi | 71% | 2657 fps | 95.2% |
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 | 180gr | Winchester FailSafe. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,933 fps; across all powders the maximum-charge window runs from 1,713 fps to 2,933 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 57–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2209 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 | 180gr | Winchester FailSafe they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 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.