Load Specifications
Bullet Manufacturer:Speer
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:1:15.0
Load data in caliber .300 WSM with .308 | 180gr | Speer Grand Slam 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, Hodgdon Superformance and Alliant Reloder-16.
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 2495 | <<locked>> | 86% | 57,566 psi | 90% | 2740 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,579 psi | 87% | 2753 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,457 psi | 76% | 2733 fps | 98.7% |
| Accurate 4064 | <<locked>> | 88% | 57,696 psi | 90% | 2792 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,491 psi | 85% | 2844 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 52,576 psi | 82% | 2917 fps | 96.4% |
| ADI AR 2206H | <<locked>> | 84% | 57,043 psi | 89% | 2822 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,853 psi | 86% | 2779 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,680 psi | 87% | 2881 fps | 97.7% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,869 psi | 88% | 2769 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 57,464 psi | 90% | 2736 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 57,464 psi | 90% | 2949 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 55,637 psi | 87% | 2877 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,172 psi | 86% | 2799 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,724 psi | 87% | 2822 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,143 psi | 86% | 2897 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 56,449 psi | 88% | 2923 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,795 psi | 86% | 2867 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,269 psi | 76% | 2805 fps | 96.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,440 psi | 71% | 2753 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,885 psi | 63% | 2664 fps | 97.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,590 psi | 81% | 2933 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 57,145 psi | 90% | 2841 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 55,970 psi | 88% | 2815 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,269 psi | 76% | 2805 fps | 96.5% |
| Bofors RP7 | <<locked>> | 92% | 55,608 psi | 87% | 2795 fps | 98.5% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,319 psi | 90% | 2746 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,521 psi | 87% | 2799 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,753 psi | 89% | 2831 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 94% | 56,855 psi | 89% | 2894 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 92% | 56,956 psi | 89% | 2854 fps | 98.2% |
| Hodgdon H4895 | <<locked>> | 84% | 57,653 psi | 90% | 2831 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,361 psi | 87% | 2818 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,099 psi | 85% | 2815 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 57,377 psi | 90% | 2933 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,100 psi | 57% | 1719 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,187 psi | 86% | 2782 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,781 psi | 86% | 2759 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,360 psi | 85% | 2759 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 57,145 psi | 90% | 2792 fps | 99.1% |
| IMR 4350 | <<locked>> | 96% | 56,115 psi | 88% | 2822 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 92% | 57,334 psi | 90% | 2822 fps | 99.1% |
| IMR 4831 | <<locked>> | 96% | 54,911 psi | 86% | 2835 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 57,188 psi | 90% | 2851 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 55,274 psi | 87% | 2808 fps | 95.9% |
| IMR 8208 XBR | <<locked>> | 82% | 55,869 psi | 88% | 2769 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 57,377 psi | 90% | 2795 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,101 psi | 88% | 2746 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,360 psi | 85% | 2753 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 57,116 psi | 90% | 2815 fps | 99.7% |
| Lovex S070 | <<locked>> | 94% | 54,868 psi | 86% | 2805 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,059 psi | 63% | 2582 fps | 97% |
| Norma 201 | <<locked>> | 84% | 55,796 psi | 87% | 2766 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,449 psi | 88% | 2762 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,969 psi | 86% | 2808 fps | 100% |
| Norma 204 | <<locked>> | 96% | 57,116 psi | 90% | 2877 fps | 97.8% |
| Norma MRPᴾ | <<locked>> | 100% | 50,894 psi | 80% | 2887 fps | 98.4% |
| Norma URP | <<locked>> | 96% | 56,782 psi | 89% | 2877 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 55,593 psi | 87% | 2835 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 55,608 psi | 87% | 2881 fps | 99.5% |
| Ramshot TAC | <<locked>> | 82% | 56,072 psi | 88% | 2795 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,869 psi | 88% | 2808 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,637 psi | 57% | 1759 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,565 psi | 89% | 2812 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,333 psi | 88% | 2887 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,072 psi | 88% | 2920 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,186 psi | 85% | 2864 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 56,840 psi | 89% | 2949 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 56,797 psi | 89% | 2743 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,420 psi | 88% | 2766 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,101 psi | 88% | 2812 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 57,421 psi | 90% | 2848 fps | 96.9% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,635 psi | 84% | 2848 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 92% | 55,608 psi | 87% | 2795 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 94% | 57,116 psi | 90% | 2815 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 84% | 57,377 psi | 90% | 2795 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,360 psi | 85% | 2753 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,868 psi | 86% | 2805 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 57,740 psi | 90% | 2871 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,810 psi | 86% | 2776 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,434 psi | 87% | 2795 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,927 psi | 89% | 2697 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 57,624 psi | 90% | 2700 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 57,159 psi | 90% | 2772 fps | 99.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,127 psi | 83% | 2844 fps | 97.5% |
| Somchem S335 | <<locked>> | 84% | 56,420 psi | 88% | 2694 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,288 psi | 85% | 2762 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 56,057 psi | 88% | 2805 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,622 psi | 87% | 2881 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,534 psi | 85% | 2828 fps | 98.4% |
| Vihtavuori N133 | <<locked>> | 84% | 57,348 psi | 90% | 2680 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,492 psi | 89% | 2723 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,971 psi | 89% | 2740 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 57,508 psi | 90% | 2782 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,593 psi | 87% | 2822 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,050 psi | 74% | 2694 fps | 96.6% |
| Vihtavuori N530 | <<locked>> | 82% | 56,376 psi | 88% | 2766 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 55,172 psi | 86% | 2740 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,534 psi | 85% | 2828 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,937 psi | 80% | 2831 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,245 psi | 87% | 2795 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,710 psi | 89% | 2815 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 57,145 psi | 90% | 2897 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,872 psi | 64% | 2792 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,709 psi | 87% | 2805 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,126 psi | 80% | 2766 fps | 96.8% |
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 2495 | <<locked>> | 80% | 47,413 psi | 74% | 2602 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,803 psi | 72% | 2592 fps | 96.5% |
| Accurate 3100 | <<locked>> | 90% | 34,389 psi | 54% | 2461 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 44,889 psi | 70% | 2605 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,707 psi | 53% | 2457 fps | 96.7% |
| Accurate High Country | <<locked>> | 98% | 49,211 psi | 77% | 2858 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 50,488 psi | 79% | 2723 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,844 psi | 67% | 2575 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 45,788 psi | 72% | 2710 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,562 psi | 82% | 2720 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,824 psi | 84% | 2690 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,514 psi | 73% | 2776 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 45,832 psi | 72% | 2710 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,975 psi | 67% | 2598 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,050 psi | 72% | 2664 fps | 99.7% |
| Alliant Reloder-16 | 51.8 gr | 80% | 33,431 psi | 52% | 2467 fps | 96.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,492 psi | 59% | 2592 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 94% | 45,237 psi | 71% | 2703 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 98% | 45,063 psi | 71% | 2746 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,514 psi | 43% | 2329 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,157 psi | 55% | 2549 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 86% | 31,386 psi | 49% | 2497 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,922 psi | 78% | 2733 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 42,946 psi | 67% | 2608 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 45,063 psi | 71% | 2746 fps | 95.7% |
| Bofors RP7 | <<locked>> | 82% | 40,799 psi | 64% | 2533 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,998 psi | 85% | 2703 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,982 psi | 81% | 2746 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,526 psi | 68% | 2615 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 82% | 38,174 psi | 60% | 2556 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 84% | 44,106 psi | 69% | 2635 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 51,024 psi | 80% | 2733 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,821 psi | 48% | 2365 fps | 97.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,239 psi | 74% | 2710 fps | 100% |
| Hodgdon Superformance | 61.9 gr | 84% | 40,045 psi | 63% | 2625 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,905 psi | 42% | 1535 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,747 psi | 76% | 2680 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,358 psi | 80% | 2713 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,049 psi | 71% | 2608 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,398 psi | 74% | 2635 fps | 97.6% |
| IMR 4350 | <<locked>> | 86% | 41,089 psi | 64% | 2562 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,639 psi | 62% | 2510 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 32,532 psi | 51% | 2411 fps | 96.3% |
| IMR 4895 | <<locked>> | 80% | 47,239 psi | 74% | 2694 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 98% | 52,011 psi | 82% | 2756 fps | 95.1% |
| IMR 8208 XBR | <<locked>> | 80% | 52,562 psi | 82% | 2720 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,328 psi | 79% | 2697 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,690 psi | 78% | 2651 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,121 psi | 71% | 2608 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,202 psi | 58% | 2461 fps | 96.4% |
| Lovex S070 | <<locked>> | 82% | 37,724 psi | 59% | 2493 fps | 95.3% |
| Lovex S071 | <<locked>> | 96% | 35,244 psi | 55% | 2480 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 49,298 psi | 77% | 2667 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,879 psi | 78% | 2667 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,426 psi | 71% | 2654 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 46,702 psi | 73% | 2707 fps | 95.6% |
| Norma MRP | <<locked>> | 92% | 38,885 psi | 61% | 2648 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 33,779 psi | 53% | 2457 fps | 96.6% |
| Ramshot Big Game | <<locked>> | 80% | 45,223 psi | 71% | 2667 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 35,027 psi | 55% | 2493 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 52,359 psi | 82% | 2740 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,330 psi | 82% | 2756 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,456 psi | 43% | 1575 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,729 psi | 69% | 2598 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,255 psi | 77% | 2776 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,885 psi | 63% | 2651 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,272 psi | 52% | 2470 fps | 96.2% |
| ReloadSwiss RS 70 | 56.6 gr | 80% | 32,808 psi | 51% | 2467 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 53,432 psi | 84% | 2694 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,094 psi | 74% | 2625 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,524 psi | 64% | 2556 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 96% | 50,604 psi | 79% | 2743 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 94% | 44,048 psi | 69% | 2684 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 82% | 40,799 psi | 64% | 2533 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,202 psi | 58% | 2461 fps | 96.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,328 psi | 79% | 2697 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,121 psi | 71% | 2608 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 37,724 psi | 59% | 2493 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,495 psi | 65% | 2605 fps | 99.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,053 psi | 80% | 2720 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,878 psi | 77% | 2690 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,372 psi | 79% | 2608 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,380 psi | 66% | 2480 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 38,827 psi | 61% | 2457 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 43,627 psi | 68% | 2677 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 50,024 psi | 78% | 2608 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,807 psi | 80% | 2710 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,002 psi | 64% | 2556 fps | 99.6% |
| Somchem S365 | <<locked>> | 80% | 30,327 psi | 48% | 2411 fps | 98.6% |
| Somchem S385 | <<locked>> | 92% | 41,916 psi | 66% | 2612 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 50,894 psi | 80% | 2595 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,036 psi | 74% | 2592 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,297 psi | 74% | 2605 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,146 psi | 61% | 2490 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 35,157 psi | 55% | 2457 fps | 97% |
| Vihtavuori N165 | <<locked>> | 96% | 41,191 psi | 65% | 2585 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 52,678 psi | 83% | 2717 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,542 psi | 71% | 2595 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,577 psi | 54% | 2454 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 84% | 29,892 psi | 47% | 2405 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,476 psi | 54% | 2428 fps | 98.8% |
| Winchester 748 | <<locked>> | 80% | 53,026 psi | 83% | 2762 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 38,363 psi | 60% | 2559 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 25,904 psi | 41% | 2349 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,776 psi | 76% | 2700 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 44,585 psi | 70% | 2654 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 106 powders for .300 WSM loaded with the .308 | 180gr | Speer Grand Slam. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,949 fps; across all powders the maximum-charge window runs from 1,719 fps to 2,949 fps. Accurate 3100 gives the best case fill at 100 %, and 106 of the 106 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 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, 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, Hodgdon Superformance, Alliant Reloder-16 rank at the top here: for .300 WSM with the .308 | 180gr | Speer Grand Slam 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.