Load Specifications
Bullet Manufacturer:Sierra
Bullet Weight:205 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 | 205gr | Sierra GameKing 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-26, ReloadSwiss RS 70 and Hodgdon Superformance.
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>> | 82% | 54,810 psi | 86% | 2523 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 57,363 psi | 90% | 2608 fps | 99.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,447 psi | 84% | 2641 fps | 99.8% |
| Accurate 4064 | <<locked>> | 84% | 55,274 psi | 87% | 2575 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,840 psi | 88% | 2684 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 57,638 psi | 90% | 2648 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,434 psi | 87% | 2612 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,579 psi | 89% | 2726 fps | 98.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,259 psi | 85% | 2723 fps | 97.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,549 psi | 85% | 2726 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 56,797 psi | 89% | 2726 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,130 psi | 88% | 2631 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,347 psi | 88% | 2651 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,492 psi | 89% | 2733 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,099 psi | 85% | 2707 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,970 psi | 88% | 2717 fps | 98.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,084 psi | 83% | 2723 fps | 98.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,227 psi | 79% | 2654 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,642 psi | 68% | 2592 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 53,650 psi | 84% | 2789 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,493 psi | 90% | 2667 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,733 psi | 76% | 2651 fps | 97.9% |
| Bofors RP3 | <<locked>> | 86% | 57,000 psi | 89% | 2644 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,084 psi | 83% | 2723 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 56,231 psi | 88% | 2635 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 86% | 57,319 psi | 90% | 2664 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,666 psi | 87% | 2703 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 92% | 56,057 psi | 88% | 2671 fps | 99.1% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 50,227 psi | 79% | 2608 fps | 96.1% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,000 psi | 89% | 2707 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,985 psi | 89% | 2661 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 55,303 psi | 87% | 2651 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,685 psi | 67% | 2621 fps | 97.2% |
| Hodgdon Superformance | <<locked>> | 90% | 54,186 psi | 85% | 2720 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,463 psi | 57% | 1608 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,853 psi | 86% | 2598 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 57,740 psi | 90% | 2608 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 57,566 psi | 90% | 2628 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,536 psi | 89% | 2615 fps | 99.7% |
| IMR 4350 | <<locked>> | 94% | 57,232 psi | 90% | 2671 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,491 psi | 85% | 2612 fps | 99.5% |
| IMR 4831 | <<locked>> | 98% | 57,014 psi | 89% | 2684 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,317 psi | 85% | 2628 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,999 psi | 88% | 2657 fps | 97.5% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,883 psi | 88% | 2762 fps | 98% |
| Lovex S060 | <<locked>> | 82% | 56,217 psi | 88% | 2572 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,013 psi | 86% | 2585 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,491 psi | 85% | 2608 fps | 99.9% |
| Lovex S070 | <<locked>> | 92% | 55,680 psi | 87% | 2648 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,599 psi | 70% | 2507 fps | 99% |
| Norma 201 | <<locked>> | 82% | 56,246 psi | 88% | 2592 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,014 psi | 89% | 2585 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,637 psi | 87% | 2638 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,172 psi | 85% | 2667 fps | 98.5% |
| Norma MRPᴾ | <<locked>> | 100% | 56,362 psi | 88% | 2799 fps | 99.8% |
| Norma URP | <<locked>> | 92% | 54,375 psi | 85% | 2667 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,507 psi | 89% | 2667 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,521 psi | 87% | 2766 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 94% | 56,855 psi | 89% | 2723 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,069 psi | 82% | 2690 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,101 psi | 58% | 1647 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,087 psi | 89% | 2651 fps | 99.9% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,421 psi | 90% | 2713 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,522 psi | 90% | 2746 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,448 psi | 87% | 2703 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,027 psi | 85% | 2733 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,453 psi | 67% | 2615 fps | 98.2% |
| Rottweil R 902 | <<locked>> | 84% | 56,956 psi | 89% | 2592 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,130 psi | 90% | 2641 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,882 psi | 86% | 2648 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 98% | 55,158 psi | 86% | 2703 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 90% | 56,231 psi | 88% | 2635 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,491 psi | 85% | 2608 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 55,013 psi | 86% | 2585 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,695 psi | 87% | 2648 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,882 psi | 86% | 2651 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,941 psi | 88% | 2621 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,159 psi | 90% | 2523 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,723 psi | 86% | 2487 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,667 psi | 90% | 2615 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,679 psi | 86% | 2700 fps | 98.9% |
| Somchem S335 | <<locked>> | 82% | 56,681 psi | 89% | 2520 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,782 psi | 89% | 2635 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,652 psi | 89% | 2644 fps | 97.3% |
| Somchem S365 | <<locked>> | 96% | 57,493 psi | 90% | 2717 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,869 psi | 88% | 2680 fps | 99.4% |
| Unknown powder | <<locked>> | 90% | 55,158 psi | 86% | 2674 fps | 100% |
| Vihtavuori N133 | <<locked>> | 82% | 57,667 psi | 90% | 2503 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,363 psi | 90% | 2549 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,653 psi | 90% | 2569 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,795 psi | 86% | 2569 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,666 psi | 89% | 2661 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,576 psi | 81% | 2608 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 84% | 55,782 psi | 87% | 2569 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,724 psi | 87% | 2667 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,115 psi | 88% | 2723 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,681 psi | 89% | 2792 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,072 psi | 88% | 2631 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,666 psi | 87% | 2703 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,208 psi | 71% | 2713 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,070 psi | 85% | 2651 fps | 98.6% |
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 2495 | <<locked>> | 80% | 51,619 psi | 81% | 2484 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,121 psi | 69% | 2405 fps | 97.5% |
| Accurate 3100 | <<locked>> | 84% | 31,198 psi | 49% | 2238 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 48,907 psi | 77% | 2490 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,188 psi | 58% | 2379 fps | 98.9% |
| ADI AR 2206H | <<locked>> | 80% | 54,172 psi | 85% | 2602 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 46,122 psi | 72% | 2470 fps | 100% |
| ADI AR 2209 | <<locked>> | 88% | 41,104 psi | 64% | 2467 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 94% | 44,628 psi | 70% | 2559 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,807 psi | 80% | 2671 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 38,624 psi | 61% | 2415 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,456 psi | 73% | 2490 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,719 psi | 78% | 2556 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,201 psi | 57% | 2385 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,915 psi | 64% | 2500 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 38,232 psi | 60% | 2408 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 90% | 38,189 psi | 60% | 2451 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,658 psi | 42% | 2172 fps | 97.1% |
| Alliant Reloder-25 | <<locked>> | 88% | 30,095 psi | 47% | 2277 fps | 95.2% |
| Alliant Reloder-26 | 55.9 gr | 80% | 28,239 psi | 44% | 2267 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,795 psi | 84% | 2618 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 40,147 psi | 63% | 2493 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 46,949 psi | 74% | 2507 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 38,189 psi | 60% | 2451 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 41,220 psi | 65% | 2388 fps | 97% |
| Hodgdon H380 | <<locked>> | 80% | 47,123 psi | 74% | 2513 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 42,453 psi | 67% | 2487 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 80% | 38,769 psi | 61% | 2372 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 98% | 47,036 psi | 74% | 2552 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 94% | 46,775 psi | 73% | 2549 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,808 psi | 53% | 2290 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,428 psi | 76% | 2552 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 37,623 psi | 59% | 2503 fps | 95.2% |
| Hodgdon Superformance | 57.6 gr | 80% | 37,869 psi | 59% | 2428 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,224 psi | 43% | 1434 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,588 psi | 76% | 2507 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,097 psi | 80% | 2523 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,266 psi | 71% | 2448 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,483 psi | 70% | 2425 fps | 98.2% |
| IMR 4350 | <<locked>> | 80% | 36,927 psi | 58% | 2323 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,714 psi | 67% | 2418 fps | 97.8% |
| IMR 4831 | <<locked>> | 80% | 32,518 psi | 51% | 2264 fps | 97.8% |
| IMR 4895 | <<locked>> | 80% | 50,981 psi | 80% | 2582 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 46,659 psi | 73% | 2513 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 94% | 45,397 psi | 71% | 2589 fps | 95.7% |
| Lovex S060 | <<locked>> | 80% | 53,127 psi | 83% | 2530 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,733 psi | 76% | 2497 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,277 psi | 63% | 2372 fps | 98.4% |
| Lovex S070 | <<locked>> | 80% | 38,377 psi | 60% | 2356 fps | 97% |
| Lovex S071 | <<locked>> | 88% | 30,429 psi | 48% | 2221 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 53,098 psi | 83% | 2549 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,505 psi | 84% | 2543 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,052 psi | 77% | 2543 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,539 psi | 65% | 2457 fps | 95.8% |
| Norma MRP | <<locked>> | 86% | 34,925 psi | 55% | 2408 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 36,941 psi | 58% | 2372 fps | 98.7% |
| Ramshot Big Game | <<locked>> | 80% | 49,327 psi | 77% | 2566 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 44,512 psi | 70% | 2582 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 35,839 psi | 56% | 2362 fps | 97% |
| Ramshot Magnum | <<locked>> | 92% | 38,537 psi | 60% | 2451 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,862 psi | 44% | 1473 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,239 psi | 74% | 2500 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,766 psi | 84% | 2664 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,482 psi | 68% | 2546 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,883 psi | 58% | 2395 fps | 98.6% |
| ReloadSwiss RS 70 | 55.4 gr | 80% | 35,824 psi | 56% | 2402 fps | 98% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 34,563 psi | 54% | 2428 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 50,430 psi | 79% | 2503 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,077 psi | 69% | 2454 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 42,656 psi | 67% | 2448 fps | 95% |
| Rottweil R 905 | <<locked>> | 88% | 39,827 psi | 62% | 2444 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 41,220 psi | 65% | 2388 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,277 psi | 63% | 2372 fps | 98.4% |
| Shooters World Precision | <<locked>> | 80% | 48,733 psi | 76% | 2497 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,392 psi | 60% | 2356 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,179 psi | 71% | 2507 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,591 psi | 82% | 2575 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,838 psi | 84% | 2480 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,527 psi | 71% | 2362 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,334 psi | 62% | 2323 fps | 97.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 39,450 psi | 62% | 2441 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 53,592 psi | 84% | 2480 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,541 psi | 70% | 2454 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 46,427 psi | 73% | 2487 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 33,446 psi | 52% | 2336 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 35,520 psi | 56% | 2329 fps | 95.2% |
| Unknown powder | <<locked>> | 80% | 39,856 psi | 62% | 2425 fps | 98.8% |
| Vihtavuori N133 | <<locked>> | 80% | 54,404 psi | 85% | 2464 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,836 psi | 80% | 2467 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,836 psi | 80% | 2480 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,366 psi | 66% | 2388 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,392 psi | 60% | 2372 fps | 99% |
| Vihtavuori N165 | <<locked>> | 90% | 37,202 psi | 58% | 2359 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 49,052 psi | 77% | 2480 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,782 psi | 59% | 2372 fps | 98.7% |
| Vihtavuori N555 | <<locked>> | 80% | 29,298 psi | 46% | 2238 fps | 97.2% |
| Vihtavuori N560 | <<locked>> | 94% | 46,224 psi | 72% | 2618 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,347 psi | 59% | 2343 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 42,453 psi | 67% | 2487 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,496 psi | 37% | 2142 fps | 95.8% |
| Winchester Supreme 780 | <<locked>> | 88% | 40,683 psi | 64% | 2431 fps | 95.7% |
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 | 205gr | Sierra GameKing. Norma MRP delivers the highest muzzle velocity at 2,799 fps; across all powders the maximum-charge window runs from 1,608 fps to 2,799 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 57–90 %, leaving at least 10 % headroom. The 205.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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-26, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .300 WSM with the .308 | 205gr | Sierra GameKing 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.