Load Specifications
Bullet:.308 | 180gr | Speer TBBC
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:1:13.0
Load data in caliber .300 WSM with .308 | 180gr | Speer TBBC bullet and 105 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>> | 82% | 57,116 psi | 90% | 2694 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 56,855 psi | 89% | 2726 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 56,521 psi | 89% | 2779 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,217 psi | 88% | 2749 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,514 psi | 74% | 2713 fps | 98.5% |
| Accurate 4064 | <<locked>> | 88% | 57,029 psi | 89% | 2779 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 57,435 psi | 90% | 2881 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 56,463 psi | 88% | 2808 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 57,493 psi | 90% | 2808 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,752 psi | 86% | 2858 fps | 97.4% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,274 psi | 87% | 2756 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,710 psi | 89% | 2723 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 56,623 psi | 89% | 2936 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,607 psi | 86% | 2785 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,882 psi | 86% | 2805 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,404 psi | 85% | 2881 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,709 psi | 87% | 2910 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,911 psi | 84% | 2851 fps | 97.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 47,442 psi | 74% | 2785 fps | 96.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,846 psi | 70% | 2740 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,189 psi | 61% | 2641 fps | 97.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,763 psi | 80% | 2917 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,391 psi | 88% | 2828 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 55,114 psi | 86% | 2799 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 47,442 psi | 74% | 2785 fps | 96.2% |
| Bofors RP7 | <<locked>> | 92% | 54,868 psi | 86% | 2779 fps | 98.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,724 psi | 89% | 2736 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,969 psi | 86% | 2785 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,941 psi | 88% | 2818 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 57,522 psi | 90% | 2897 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 94% | 54,418 psi | 85% | 2808 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 84% | 57,087 psi | 89% | 2818 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,607 psi | 86% | 2805 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 57,246 psi | 90% | 2854 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,507 psi | 89% | 2917 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,027 psi | 56% | 1713 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 57,014 psi | 89% | 2802 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 56,043 psi | 88% | 2772 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,434 psi | 88% | 2785 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,361 psi | 87% | 2759 fps | 98.8% |
| IMR 4350 | <<locked>> | 96% | 55,419 psi | 87% | 2805 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,623 psi | 89% | 2808 fps | 98.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,694 psi | 86% | 2828 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 56,318 psi | 88% | 2835 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,274 psi | 87% | 2756 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,768 psi | 89% | 2782 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,535 psi | 87% | 2733 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 57,188 psi | 90% | 2789 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,391 psi | 88% | 2802 fps | 99.6% |
| Lovex S070 | <<locked>> | 96% | 57,638 psi | 90% | 2841 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,407 psi | 62% | 2566 fps | 96.7% |
| Norma 201 | <<locked>> | 84% | 55,201 psi | 87% | 2753 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,854 psi | 88% | 2749 fps | 100% |
| Norma 203B | <<locked>> | 88% | 57,638 psi | 90% | 2841 fps | 100% |
| Norma 204 | <<locked>> | 96% | 56,173 psi | 88% | 2858 fps | 97.6% |
| Norma MRPᴾ | <<locked>> | 100% | 50,067 psi | 78% | 2867 fps | 98.2% |
| Norma URP | <<locked>> | 96% | 56,014 psi | 88% | 2864 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 54,810 psi | 86% | 2818 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,708 psi | 84% | 2887 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 96% | 54,650 psi | 86% | 2864 fps | 99.4% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,282 psi | 73% | 2740 fps | 96.4% |
| Ramshot TAC | <<locked>> | 82% | 55,376 psi | 87% | 2779 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,376 psi | 87% | 2795 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,564 psi | 57% | 1752 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,840 psi | 88% | 2799 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,680 psi | 87% | 2874 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,288 psi | 87% | 2904 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 57,101 psi | 89% | 2904 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,941 psi | 88% | 2933 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 56,144 psi | 88% | 2730 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,854 psi | 88% | 2753 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,288 psi | 87% | 2795 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 56,782 psi | 89% | 2831 fps | 96.7% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,910 psi | 83% | 2831 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 92% | 54,868 psi | 86% | 2779 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,391 psi | 88% | 2802 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,768 psi | 89% | 2782 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 57,188 psi | 90% | 2789 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 57,638 psi | 90% | 2841 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 56,971 psi | 89% | 2854 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,012 psi | 85% | 2759 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,897 psi | 86% | 2779 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,275 psi | 88% | 2687 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,826 psi | 89% | 2684 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,507 psi | 89% | 2756 fps | 98.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,417 psi | 82% | 2828 fps | 97.3% |
| Somchem S335 | <<locked>> | 84% | 55,854 psi | 88% | 2684 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 57,450 psi | 90% | 2802 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,230 psi | 87% | 2789 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 54,476 psi | 85% | 2864 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,679 psi | 84% | 2812 fps | 98.2% |
| Unknown powder | <<locked>> | 94% | 56,971 psi | 89% | 2871 fps | 99.9% |
| Vihtavuori N133 | <<locked>> | 86% | 56,086 psi | 88% | 2664 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,753 psi | 87% | 2710 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,564 psi | 87% | 2720 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 56,768 psi | 89% | 2769 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 57,334 psi | 90% | 2838 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 44,628 psi | 70% | 2648 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 86% | 55,230 psi | 87% | 2749 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 57,682 psi | 90% | 2887 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,879 psi | 78% | 2812 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,418 psi | 85% | 2779 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,522 psi | 90% | 2897 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,161 psi | 63% | 2772 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,144 psi | 88% | 2838 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% | 53,853 psi | 84% | 2651 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,746 psi | 73% | 2589 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 52,721 psi | 83% | 2730 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 40,698 psi | 64% | 2484 fps | 95% |
| Accurate 3100 | <<locked>> | 92% | 36,071 psi | 57% | 2493 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 44,222 psi | 69% | 2592 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,141 psi | 52% | 2441 fps | 96.4% |
| ADI AR 2206H | <<locked>> | 80% | 49,893 psi | 78% | 2707 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,279 psi | 66% | 2562 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 94% | 45,150 psi | 71% | 2690 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,953 psi | 81% | 2707 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,316 psi | 84% | 2680 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,948 psi | 72% | 2759 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,424 psi | 66% | 2585 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,455 psi | 71% | 2651 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,938 psi | 52% | 2451 fps | 96.5% |
| Alliant Reloder-17 | 55 gr | 80% | 36,825 psi | 58% | 2572 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 94% | 44,643 psi | 70% | 2687 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 98% | 44,527 psi | 70% | 2730 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,151 psi | 43% | 2313 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 96% | 34,664 psi | 54% | 2530 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 88% | 33,054 psi | 52% | 2539 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,400 psi | 77% | 2720 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 42,351 psi | 66% | 2592 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 44,527 psi | 70% | 2730 fps | 95.4% |
| Bofors RP7 | <<locked>> | 82% | 40,292 psi | 63% | 2516 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,388 psi | 84% | 2687 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,387 psi | 81% | 2736 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,975 psi | 67% | 2602 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 80% | 38,218 psi | 60% | 2552 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 86% | 42,569 psi | 67% | 2598 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 50,401 psi | 79% | 2717 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,487 psi | 48% | 2352 fps | 97.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,947 psi | 69% | 2648 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 39,479 psi | 62% | 2608 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,919 psi | 42% | 1529 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,744 psi | 70% | 2608 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 46,340 psi | 73% | 2635 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,655 psi | 65% | 2539 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 41,002 psi | 64% | 2507 fps | 95.9% |
| IMR 4350 | <<locked>> | 86% | 40,625 psi | 64% | 2546 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,131 psi | 61% | 2493 fps | 95.2% |
| IMR 4831 | <<locked>> | 82% | 31,038 psi | 49% | 2372 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 46,615 psi | 73% | 2680 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 80% | 51,953 psi | 81% | 2707 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,719 psi | 78% | 2684 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,139 psi | 77% | 2638 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 44,512 psi | 70% | 2592 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 36,695 psi | 57% | 2448 fps | 96.1% |
| Lovex S070 | <<locked>> | 82% | 37,246 psi | 58% | 2477 fps | 95% |
| Lovex S071 | <<locked>> | 96% | 34,635 psi | 54% | 2461 fps | 95% |
| Norma 201 | <<locked>> | 80% | 48,704 psi | 76% | 2654 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,211 psi | 77% | 2654 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,831 psi | 70% | 2638 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 45,992 psi | 72% | 2690 fps | 95.3% |
| Norma MRP | <<locked>> | 94% | 40,857 psi | 64% | 2687 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 33,243 psi | 52% | 2438 fps | 96.3% |
| Ramshot Big Game | <<locked>> | 80% | 44,686 psi | 70% | 2657 fps | 99.7% |
| Ramshot Grand | <<locked>> | 98% | 49,835 psi | 78% | 2822 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 84% | 36,869 psi | 58% | 2533 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 98% | 43,018 psi | 67% | 2677 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 51,851 psi | 81% | 2726 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,793 psi | 81% | 2743 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,282 psi | 43% | 1565 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,250 psi | 68% | 2585 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,617 psi | 76% | 2762 fps | 99.8% |
| ReloadSwiss RS 60 | 55 gr | 80% | 39,175 psi | 61% | 2631 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,779 psi | 51% | 2454 fps | 95.9% |
| ReloadSwiss RS 70 | 57.3 gr | 82% | 34,679 psi | 54% | 2513 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 52,779 psi | 83% | 2680 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,485 psi | 73% | 2612 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,943 psi | 63% | 2539 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 96% | 49,980 psi | 78% | 2726 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 94% | 43,395 psi | 68% | 2667 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 82% | 40,292 psi | 63% | 2516 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,695 psi | 57% | 2448 fps | 96.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,719 psi | 78% | 2684 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,512 psi | 70% | 2592 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 37,246 psi | 58% | 2477 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,944 psi | 64% | 2592 fps | 99.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,517 psi | 79% | 2707 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,298 psi | 76% | 2677 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,763 psi | 78% | 2595 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,800 psi | 66% | 2467 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 38,348 psi | 60% | 2444 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 45,919 psi | 72% | 2717 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 49,443 psi | 77% | 2595 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,299 psi | 79% | 2697 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 40,451 psi | 63% | 2543 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 29,878 psi | 47% | 2395 fps | 98.4% |
| Somchem S385 | <<locked>> | 92% | 41,292 psi | 65% | 2595 fps | 95.4% |
| Unknown powder | <<locked>> | 80% | 36,027 psi | 56% | 2493 fps | 96.6% |
| Vihtavuori N133 | <<locked>> | 80% | 47,050 psi | 74% | 2539 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,311 psi | 73% | 2579 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,006 psi | 72% | 2582 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,664 psi | 54% | 2398 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 36,071 psi | 57% | 2470 fps | 97.2% |
| Vihtavuori N165 | <<locked>> | 98% | 41,829 psi | 66% | 2595 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 45,614 psi | 71% | 2605 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,521 psi | 57% | 2510 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 84% | 29,414 psi | 46% | 2388 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,127 psi | 53% | 2415 fps | 98.6% |
| Winchester 760 | <<locked>> | 80% | 38,218 psi | 60% | 2552 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,180 psi | 43% | 2395 fps | 96.1% |
| Winchester Supreme 780 | <<locked>> | 94% | 45,194 psi | 71% | 2661 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 117 powders for .300 WSM loaded with the .308 | 180gr | Speer TBBC. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,936 fps; across all powders the maximum-charge window runs from 1,713 fps to 2,936 fps. Accurate 3100 gives the best case fill at 100 %, and 117 of the 117 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 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. Alliant Reloder-17, ReloadSwiss RS 60, ReloadSwiss RS 70 rank at the top here: for .300 WSM with the .308 | 180gr | Speer TBBC 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.