Load Specifications
Bullet:.308 | 172gr | Speer Impact
Bullet Manufacturer:Speer
Bullet Weight:172 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:1:11.5
Load data in caliber .300 WSM with .308 | 172gr | Speer Impact bullet and 103 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, 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>> | 82% | 54,810 psi | 86% | 2723 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 57,377 psi | 90% | 2795 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 57,363 psi | 90% | 2851 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 57,159 psi | 90% | 2812 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 44,367 psi | 70% | 2710 fps | 97.3% |
| Accurate 4064 | <<locked>> | 90% | 57,479 psi | 90% | 2844 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 57,624 psi | 90% | 2940 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 86% | 57,435 psi | 90% | 2881 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 55,100 psi | 86% | 2831 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 52,098 psi | 82% | 2864 fps | 96.2% |
| ADI Benchmark 8208 | <<locked>> | 84% | 56,289 psi | 88% | 2828 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 57,551 psi | 90% | 2795 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 57,537 psi | 90% | 3005 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,172 psi | 86% | 2851 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,767 psi | 87% | 2874 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 54,984 psi | 86% | 2943 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 56,173 psi | 88% | 2976 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 50,966 psi | 80% | 2851 fps | 96.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,047 psi | 66% | 2740 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,500 psi | 74% | 2913 fps | 99.3% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 57,377 psi | 90% | 2897 fps | 100% |
| Bofors RP3 | <<locked>> | 90% | 55,956 psi | 88% | 2867 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,709 psi | 87% | 2841 fps | 98% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,433 psi | 85% | 2759 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,840 psi | 88% | 2858 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 56,115 psi | 88% | 2802 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 56,681 psi | 89% | 2881 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 54,491 psi | 85% | 2907 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 96% | 55,071 psi | 86% | 2867 fps | 97.3% |
| Hodgdon H4895 | <<locked>> | 84% | 54,534 psi | 85% | 2838 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 54,766 psi | 86% | 2867 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,201 psi | 85% | 2871 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 57,290 psi | 90% | 2982 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,839 psi | 56% | 1742 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 54,563 psi | 86% | 2822 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 56,869 psi | 89% | 2844 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 57,203 psi | 90% | 2851 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 92% | 56,246 psi | 88% | 2825 fps | 98.5% |
| IMR 4350 | <<locked>> | 98% | 56,217 psi | 88% | 2871 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 94% | 57,522 psi | 90% | 2871 fps | 98.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,692 psi | 81% | 2838 fps | 99.7% |
| IMR 4895 | <<locked>> | 88% | 57,217 psi | 90% | 2904 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 56,289 psi | 88% | 2828 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 57,609 psi | 90% | 2854 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,695 psi | 89% | 2805 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 54,346 psi | 85% | 2808 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 57,174 psi | 90% | 2864 fps | 99.4% |
| Lovex S070 | <<locked>> | 96% | 54,795 psi | 86% | 2851 fps | 98.5% |
| Norma 201 | <<locked>> | 86% | 56,173 psi | 88% | 2822 fps | 100% |
| Norma 202 | <<locked>> | 86% | 56,811 psi | 89% | 2822 fps | 100% |
| Norma 203B | <<locked>> | 88% | 54,984 psi | 86% | 2861 fps | 100% |
| Norma 204 | <<locked>> | 98% | 56,985 psi | 89% | 2920 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 47,050 psi | 74% | 2861 fps | 96.9% |
| Norma URP | <<locked>> | 98% | 56,579 psi | 89% | 2930 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 55,579 psi | 87% | 2887 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 55,158 psi | 86% | 2923 fps | 99.1% |
| Ramshot TAC | <<locked>> | 84% | 56,405 psi | 88% | 2848 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 84% | 56,318 psi | 88% | 2867 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 57,072 psi | 89% | 2828 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,332 psi | 57% | 1781 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,898 psi | 89% | 2864 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 56,420 psi | 88% | 2943 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 56,014 psi | 88% | 2976 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 57,508 psi | 90% | 2966 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 56,724 psi | 89% | 2995 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 84% | 57,087 psi | 89% | 2802 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,565 psi | 89% | 2818 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 55,796 psi | 87% | 2858 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 49,734 psi | 78% | 2831 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 94% | 55,709 psi | 87% | 2841 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 96% | 57,174 psi | 90% | 2864 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 86% | 57,609 psi | 90% | 2854 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 54,346 psi | 85% | 2808 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 54,795 psi | 86% | 2851 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 57,580 psi | 90% | 2920 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,984 psi | 86% | 2828 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,840 psi | 88% | 2851 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 57,551 psi | 90% | 2756 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 57,740 psi | 90% | 2753 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 57,479 psi | 90% | 2822 fps | 98.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 49,255 psi | 77% | 2825 fps | 95.9% |
| Somchem S321 | <<locked>> | 82% | 57,522 psi | 90% | 2858 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 56,898 psi | 89% | 2756 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,621 psi | 86% | 2818 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 56,101 psi | 88% | 2858 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 54,737 psi | 86% | 2930 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,502 psi | 79% | 2812 fps | 97.1% |
| Unknown powder | <<locked>> | 96% | 57,319 psi | 90% | 2933 fps | 99.7% |
| Vihtavuori N130 | <<locked>> | 82% | 55,825 psi | 87% | 2700 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 57,232 psi | 90% | 2736 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 56,681 psi | 89% | 2782 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,521 psi | 89% | 2792 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 57,479 psi | 90% | 2838 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,346 psi | 85% | 2851 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 82% | 55,927 psi | 88% | 2831 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 56,188 psi | 88% | 2818 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,708 psi | 86% | 2900 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,760 psi | 73% | 2818 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 55,434 psi | 87% | 2848 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,522 psi | 90% | 2881 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,491 psi | 85% | 2907 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,710 psi | 59% | 2756 fps | 99.7% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 52,692 psi | 83% | 2835 fps | 96.3% |
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% | 51,619 psi | 81% | 2680 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,411 psi | 70% | 2612 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,082 psi | 78% | 2749 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 44,280 psi | 69% | 2598 fps | 95.3% |
| Accurate 3100 | <<locked>> | 96% | 38,638 psi | 61% | 2598 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 42,003 psi | 66% | 2608 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 33,272 psi | 52% | 2493 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 47,572 psi | 75% | 2723 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 40,495 psi | 63% | 2575 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 98% | 48,849 psi | 77% | 2805 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,647 psi | 78% | 2726 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,502 psi | 79% | 2703 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,598 psi | 68% | 2766 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,408 psi | 63% | 2598 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,207 psi | 68% | 2664 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 82% | 33,330 psi | 52% | 2507 fps | 95.9% |
| Alliant Reloder-17 | 54.2 gr | 80% | 34,853 psi | 55% | 2572 fps | 98.2% |
| Alliant Reloder-19 | <<locked>> | 98% | 47,790 psi | 75% | 2792 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 88% | 28,979 psi | 45% | 2411 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 92% | 35,723 psi | 56% | 2651 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,847 psi | 73% | 2730 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 40,234 psi | 63% | 2605 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 43,627 psi | 68% | 2631 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,140 psi | 80% | 2710 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,936 psi | 77% | 2753 fps | 100% |
| Hodgdon H322 | <<locked>> | 80% | 52,823 psi | 83% | 2756 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,814 psi | 64% | 2608 fps | 97.5% |
| Hodgdon H414 | <<locked>> | 84% | 41,394 psi | 65% | 2671 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 90% | 45,730 psi | 72% | 2710 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 48,022 psi | 75% | 2733 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,761 psi | 45% | 2352 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,611 psi | 65% | 2661 fps | 99.6% |
| Hodgdon Superformance | 63.1 gr | 88% | 43,076 psi | 68% | 2730 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,629 psi | 42% | 1555 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,627 psi | 67% | 2621 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 44,034 psi | 69% | 2657 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,595 psi | 62% | 2549 fps | 98.4% |
| IMR 4166 Enduron | <<locked>> | 82% | 41,901 psi | 66% | 2572 fps | 95.5% |
| IMR 4350 | <<locked>> | 90% | 43,888 psi | 69% | 2661 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,322 psi | 66% | 2608 fps | 95.5% |
| IMR 4831 | <<locked>> | 84% | 31,183 psi | 49% | 2425 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 44,266 psi | 69% | 2690 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 80% | 49,647 psi | 78% | 2726 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,152 psi | 74% | 2700 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,253 psi | 74% | 2654 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 42,540 psi | 67% | 2612 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 37,130 psi | 58% | 2503 fps | 95.6% |
| Lovex S070 | <<locked>> | 86% | 40,161 psi | 63% | 2589 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 46,644 psi | 73% | 2674 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,094 psi | 74% | 2677 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,569 psi | 67% | 2651 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 49,647 psi | 78% | 2805 fps | 95.6% |
| Norma MRP | <<locked>> | 96% | 41,118 psi | 64% | 2740 fps | 95.1% |
| Norma URP | <<locked>> | 82% | 33,475 psi | 52% | 2493 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 42,380 psi | 66% | 2667 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 37,246 psi | 58% | 2589 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 49,690 psi | 78% | 2743 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,182 psi | 77% | 2756 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,476 psi | 84% | 2776 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,151 psi | 43% | 1594 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,205 psi | 65% | 2592 fps | 96% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,934 psi | 72% | 2772 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,086 psi | 58% | 2638 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 32,924 psi | 52% | 2507 fps | 95.2% |
| ReloadSwiss RS 70 | 57.8 gr | 84% | 35,128 psi | 55% | 2569 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 50,604 psi | 79% | 2707 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,483 psi | 70% | 2628 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 37,710 psi | 59% | 2546 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 98% | 46,702 psi | 73% | 2776 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 86% | 43,627 psi | 68% | 2631 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 82% | 37,130 psi | 58% | 2503 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,152 psi | 74% | 2700 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,540 psi | 67% | 2612 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 40,161 psi | 63% | 2589 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,769 psi | 61% | 2598 fps | 98.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,153 psi | 75% | 2720 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,064 psi | 72% | 2694 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,790 psi | 75% | 2618 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,958 psi | 63% | 2487 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 41,568 psi | 65% | 2556 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 46,267 psi | 73% | 2772 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 53,795 psi | 84% | 2805 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 47,456 psi | 74% | 2618 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,718 psi | 75% | 2710 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 38,551 psi | 60% | 2556 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 28,094 psi | 44% | 2392 fps | 97.1% |
| Somchem S385 | <<locked>> | 96% | 44,324 psi | 69% | 2703 fps | 95.6% |
| Unknown powder | <<locked>> | 80% | 34,040 psi | 53% | 2497 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 52,634 psi | 82% | 2657 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,092 psi | 71% | 2562 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,092 psi | 69% | 2602 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,947 psi | 69% | 2605 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,967 psi | 52% | 2408 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 80% | 34,084 psi | 53% | 2474 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 52,402 psi | 82% | 2779 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,642 psi | 68% | 2625 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,505 psi | 54% | 2513 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 88% | 31,473 psi | 49% | 2493 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,329 psi | 51% | 2418 fps | 97.5% |
| Winchester 748 | <<locked>> | 80% | 53,693 psi | 84% | 2828 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 41,394 psi | 65% | 2671 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 90% | 27,412 psi | 43% | 2434 fps | 95.1% |
| Winchester Supreme 780 | <<locked>> | 98% | 49,211 psi | 77% | 2776 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 103 powders for .300 WSM loaded with the .308 | 172gr | Speer Impact. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,005 fps; across all powders the maximum-charge window runs from 1,742 fps to 3,005 fps. Accurate 3100 gives the best case fill at 100 %, and 103 of the 103 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 172.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .300 WSM with the .308 | 172gr | Speer Impact 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.