Load Specifications
Bullet Manufacturer:Hammer
Bullet Weight:166 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:1:12.5
Load data in caliber .300 WSM with .308 | 166gr | Hammer Stone Hammer bullet and 101 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and ReloadSwiss RS 70.
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% | 56,521 psi | 89% | 2805 fps | 100% |
| Accurate 2495 | <<locked>> | 84% | 56,101 psi | 88% | 2858 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,492 psi | 87% | 2887 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 55,912 psi | 88% | 2848 fps | 97.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 44,092 psi | 69% | 2753 fps | 97% |
| Accurate 4064 | <<locked>> | 90% | 57,087 psi | 89% | 2897 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 57,392 psi | 90% | 2992 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 86% | 57,188 psi | 90% | 2933 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 54,781 psi | 86% | 2881 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,854 psi | 88% | 2874 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 57,116 psi | 90% | 2848 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 57,159 psi | 90% | 3058 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,810 psi | 86% | 2900 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,419 psi | 87% | 2923 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 54,621 psi | 86% | 2992 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,985 psi | 88% | 3031 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 50,720 psi | 79% | 2897 fps | 95.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,930 psi | 66% | 2782 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,978 psi | 74% | 2949 fps | 99% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 57,101 psi | 89% | 2949 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 55,448 psi | 87% | 2917 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,492 psi | 87% | 2890 fps | 97.7% |
| Hodgdon Benchmark | <<locked>> | 84% | 57,508 psi | 90% | 2858 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,418 psi | 85% | 2897 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,536 psi | 89% | 2999 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 55,825 psi | 87% | 2854 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 56,449 psi | 88% | 2933 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 92% | 54,056 psi | 85% | 2953 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 98% | 57,188 psi | 90% | 2959 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 84% | 54,099 psi | 85% | 2884 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 54,375 psi | 85% | 2913 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,376 psi | 88% | 2963 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 56,768 psi | 89% | 3025 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,665 psi | 56% | 1778 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,782 psi | 89% | 2917 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 56,376 psi | 88% | 2897 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 56,637 psi | 89% | 2897 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,941 psi | 88% | 2871 fps | 98.3% |
| IMR 4350 | <<locked>> | 98% | 55,782 psi | 87% | 2917 fps | 97.8% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,260 psi | 88% | 2910 fps | 98.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,314 psi | 80% | 2884 fps | 99.5% |
| IMR 4895 | <<locked>> | 88% | 56,855 psi | 89% | 2956 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,854 psi | 88% | 2874 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 57,188 psi | 90% | 2904 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,304 psi | 88% | 2854 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 57,566 psi | 90% | 2907 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,840 psi | 89% | 2913 fps | 99.3% |
| Lovex S070 | <<locked>> | 96% | 54,476 psi | 85% | 2897 fps | 98.3% |
| Norma 201 | <<locked>> | 86% | 55,724 psi | 87% | 2871 fps | 100% |
| Norma 202 | <<locked>> | 86% | 56,289 psi | 88% | 2871 fps | 100% |
| Norma 203B | <<locked>> | 88% | 54,621 psi | 86% | 2910 fps | 100% |
| Norma 204 | <<locked>> | 98% | 56,637 psi | 89% | 2969 fps | 96.8% |
| Norma MRPᴾ | <<locked>> | 100% | 46,905 psi | 74% | 2907 fps | 96.5% |
| Norma URP | <<locked>> | 98% | 56,101 psi | 88% | 2976 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 88% | 55,303 psi | 87% | 2936 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 54,868 psi | 86% | 2972 fps | 98.9% |
| Ramshot TAC | <<locked>> | 84% | 56,260 psi | 88% | 2900 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,883 psi | 88% | 2913 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,768 psi | 89% | 2881 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,347 psi | 57% | 1824 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,594 psi | 89% | 2913 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,956 psi | 88% | 2992 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,608 psi | 87% | 3025 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 57,101 psi | 89% | 3015 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 56,289 psi | 88% | 3045 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 84% | 56,797 psi | 89% | 2854 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,362 psi | 88% | 2871 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 55,564 psi | 87% | 2910 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 55,492 psi | 87% | 2890 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,840 psi | 89% | 2913 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 86% | 57,188 psi | 90% | 2904 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 57,566 psi | 90% | 2907 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,637 psi | 89% | 2940 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 57,217 psi | 90% | 2972 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,824 psi | 86% | 2877 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,463 psi | 87% | 2900 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 57,203 psi | 90% | 2808 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 57,464 psi | 90% | 2805 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 57,116 psi | 90% | 2867 fps | 98.4% |
| Somchem S321 | <<locked>> | 82% | 57,174 psi | 90% | 2907 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 56,507 psi | 89% | 2805 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,505 psi | 85% | 2867 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 55,666 psi | 87% | 2907 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 54,157 psi | 85% | 2976 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,241 psi | 79% | 2858 fps | 96.8% |
| Unknown powder | <<locked>> | 96% | 57,188 psi | 90% | 2986 fps | 99.6% |
| Vihtavuori N130 | <<locked>> | 82% | 55,637 psi | 87% | 2753 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 56,913 psi | 89% | 2789 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,882 psi | 86% | 2822 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,985 psi | 88% | 2838 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 56,956 psi | 89% | 2884 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 53,954 psi | 85% | 2897 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 55,564 psi | 87% | 2881 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 55,811 psi | 87% | 2867 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,317 psi | 85% | 2946 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,282 psi | 73% | 2861 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 55,071 psi | 86% | 2894 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,145 psi | 90% | 2933 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,056 psi | 85% | 2953 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,449 psi | 59% | 2795 fps | 99.5% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 52,576 psi | 82% | 2881 fps | 96% |
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% | 49,922 psi | 78% | 2717 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 49,110 psi | 77% | 2759 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,443 psi | 76% | 2782 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 45,672 psi | 72% | 2677 fps | 95.4% |
| Accurate 3100 | <<locked>> | 96% | 38,522 psi | 60% | 2641 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 41,568 psi | 65% | 2651 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 32,953 psi | 52% | 2530 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 47,268 psi | 74% | 2769 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 40,074 psi | 63% | 2615 fps | 98.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,371 psi | 77% | 2776 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,241 psi | 79% | 2756 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,178 psi | 68% | 2808 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,958 psi | 63% | 2641 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,931 psi | 67% | 2707 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 33,083 psi | 52% | 2543 fps | 95.4% |
| Alliant Reloder-17 | 55.4 gr | 80% | 34,679 psi | 54% | 2615 fps | 97.8% |
| Alliant Reloder-19 | <<locked>> | 98% | 47,616 psi | 75% | 2838 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 88% | 28,790 psi | 45% | 2451 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 92% | 35,534 psi | 56% | 2690 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,630 psi | 73% | 2776 fps | 99% |
| Bofors RP3 | <<locked>> | 80% | 39,929 psi | 63% | 2648 fps | 99.3% |
| Bofors RP7 | <<locked>> | 88% | 46,035 psi | 72% | 2726 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,923 psi | 80% | 2759 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,224 psi | 74% | 2782 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,736 psi | 83% | 2943 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 80% | 52,330 psi | 82% | 2805 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,480 psi | 63% | 2648 fps | 97.2% |
| Hodgdon H414 | <<locked>> | 84% | 41,046 psi | 64% | 2710 fps | 95% |
| Hodgdon H4350 | <<locked>> | 92% | 47,297 psi | 74% | 2792 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 47,747 psi | 75% | 2782 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,601 psi | 45% | 2388 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,656 psi | 67% | 2736 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 90% | 45,977 psi | 72% | 2835 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,658 psi | 42% | 1591 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,452 psi | 65% | 2654 fps | 99.2% |
| IMR 3031 | <<locked>> | 80% | 43,859 psi | 69% | 2707 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,465 psi | 62% | 2595 fps | 98.1% |
| IMR 4166 Enduron | <<locked>> | 82% | 41,510 psi | 65% | 2612 fps | 95.1% |
| IMR 4350 | <<locked>> | 90% | 43,555 psi | 68% | 2700 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,903 psi | 69% | 2694 fps | 95.7% |
| IMR 4831 | <<locked>> | 86% | 32,851 psi | 51% | 2510 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 43,990 psi | 69% | 2736 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 49,371 psi | 77% | 2776 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,789 psi | 73% | 2746 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,079 psi | 74% | 2703 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 42,308 psi | 66% | 2657 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 36,898 psi | 58% | 2546 fps | 95.1% |
| Lovex S070 | <<locked>> | 88% | 42,279 psi | 66% | 2680 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 46,195 psi | 72% | 2717 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 46,615 psi | 73% | 2723 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,293 psi | 66% | 2694 fps | 99% |
| Norma 204 | <<locked>> | 94% | 49,574 psi | 78% | 2851 fps | 95.2% |
| Norma MRP | <<locked>> | 98% | 43,787 psi | 69% | 2844 fps | 95.6% |
| Norma URP | <<locked>> | 82% | 33,185 psi | 52% | 2533 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 41,930 psi | 66% | 2707 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 39,523 psi | 62% | 2687 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 49,226 psi | 77% | 2785 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,994 psi | 77% | 2805 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,272 psi | 83% | 2828 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,948 psi | 42% | 1627 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,843 psi | 64% | 2631 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,527 psi | 71% | 2815 fps | 99.1% |
| ReloadSwiss RS 60 | 55.4 gr | 80% | 36,898 psi | 58% | 2684 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 35,056 psi | 55% | 2605 fps | 95.7% |
| ReloadSwiss RS 70 | 60.5 gr | 86% | 37,420 psi | 59% | 2671 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 50,444 psi | 79% | 2759 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,063 psi | 69% | 2671 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 37,492 psi | 59% | 2592 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 88% | 46,035 psi | 72% | 2726 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 36,898 psi | 58% | 2546 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,789 psi | 73% | 2746 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,308 psi | 66% | 2657 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 41,060 psi | 64% | 2661 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,406 psi | 60% | 2641 fps | 98.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,688 psi | 75% | 2759 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,716 psi | 72% | 2736 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,413 psi | 74% | 2664 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,639 psi | 62% | 2530 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 41,321 psi | 65% | 2595 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 53,505 psi | 84% | 2854 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 47,021 psi | 74% | 2664 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,442 psi | 74% | 2756 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 38,145 psi | 60% | 2592 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 27,905 psi | 44% | 2428 fps | 96.6% |
| Somchem S385 | <<locked>> | 96% | 43,961 psi | 69% | 2743 fps | 95.2% |
| Unknown powder | <<locked>> | 82% | 36,027 psi | 56% | 2592 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 52,533 psi | 82% | 2710 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,759 psi | 70% | 2612 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,467 psi | 67% | 2635 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,729 psi | 69% | 2651 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,648 psi | 51% | 2444 fps | 98.4% |
| Vihtavuori N160 | <<locked>> | 80% | 33,779 psi | 53% | 2510 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 52,083 psi | 82% | 2828 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,352 psi | 68% | 2671 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,200 psi | 54% | 2552 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 88% | 31,053 psi | 49% | 2526 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,140 psi | 50% | 2454 fps | 97.1% |
| Winchester 748 | <<locked>> | 80% | 53,403 psi | 84% | 2877 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 41,046 psi | 64% | 2710 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 92% | 28,964 psi | 45% | 2530 fps | 95.8% |
| Winchester Supreme 780 | <<locked>> | 98% | 48,878 psi | 77% | 2818 fps | 95.1% |
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 101 powders for .300 WSM loaded with the .308 | 166gr | Hammer Stone Hammer. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,058 fps; across all powders the maximum-charge window runs from 1,778 fps to 3,058 fps. Accurate 3100 gives the best case fill at 100 %, and 101 of the 101 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 166.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-19, Alliant Reloder-23 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 Reloder-17, ReloadSwiss RS 60, ReloadSwiss RS 70 rank at the top here: for .300 WSM with the .308 | 166gr | Hammer Stone Hammer 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.