Load Specifications
Bullet Manufacturer:Speer
Bullet Weight:200 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:1:14.5
Load data in caliber .300 WSM with .308 | 200gr | Speer Grand Slam bullet and 98 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 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.
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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% | 55,100 psi | 86% | 2566 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 57,406 psi | 90% | 2648 fps | 99.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,824 psi | 84% | 2684 fps | 99.8% |
| Accurate 4064 | <<locked>> | 84% | 55,477 psi | 87% | 2618 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,260 psi | 88% | 2726 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,579 psi | 87% | 2651 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,971 psi | 89% | 2772 fps | 98.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,534 psi | 85% | 2766 fps | 97.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,839 psi | 86% | 2769 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,260 psi | 88% | 2671 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,492 psi | 89% | 2694 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,898 psi | 89% | 2779 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,491 psi | 85% | 2753 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,086 psi | 88% | 2756 fps | 98.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,388 psi | 84% | 2762 fps | 98.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,357 psi | 79% | 2694 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,903 psi | 69% | 2631 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 53,824 psi | 84% | 2828 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,725 psi | 90% | 2713 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,052 psi | 77% | 2694 fps | 97.8% |
| Bofors RP3 | <<locked>> | 86% | 57,246 psi | 90% | 2687 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,388 psi | 84% | 2762 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 56,434 psi | 88% | 2677 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 86% | 57,566 psi | 90% | 2707 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 56,014 psi | 88% | 2746 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 92% | 56,231 psi | 88% | 2713 fps | 99% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 50,357 psi | 79% | 2644 fps | 96% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,276 psi | 90% | 2749 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 57,000 psi | 89% | 2700 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 55,376 psi | 87% | 2690 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,931 psi | 67% | 2661 fps | 97.1% |
| Hodgdon Superformance | <<locked>> | 90% | 54,549 psi | 85% | 2762 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,390 psi | 57% | 1637 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,071 psi | 86% | 2641 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,433 psi | 85% | 2608 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 57,725 psi | 90% | 2671 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,579 psi | 89% | 2654 fps | 99.6% |
| IMR 4350 | <<locked>> | 94% | 57,261 psi | 90% | 2710 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,708 psi | 86% | 2654 fps | 99.5% |
| IMR 4831 | <<locked>> | 98% | 57,334 psi | 90% | 2726 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,505 psi | 85% | 2671 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,376 psi | 88% | 2703 fps | 97.4% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,144 psi | 88% | 2805 fps | 98% |
| Lovex S060 | <<locked>> | 82% | 56,478 psi | 89% | 2618 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,216 psi | 87% | 2625 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,723 psi | 86% | 2651 fps | 99.9% |
| Lovex S070 | <<locked>> | 92% | 56,043 psi | 88% | 2694 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,846 psi | 70% | 2546 fps | 99% |
| Norma 201 | <<locked>> | 82% | 56,507 psi | 89% | 2635 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,217 psi | 90% | 2628 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,782 psi | 87% | 2680 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,404 psi | 85% | 2710 fps | 98.4% |
| Norma MRPᴾ | <<locked>> | 100% | 56,840 psi | 89% | 2844 fps | 99.8% |
| Norma URP | <<locked>> | 92% | 54,824 psi | 86% | 2710 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,666 psi | 89% | 2707 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,927 psi | 88% | 2812 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 94% | 57,058 psi | 89% | 2766 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,330 psi | 82% | 2730 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,231 psi | 58% | 1677 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,522 psi | 90% | 2694 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,012 psi | 85% | 2743 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,941 psi | 88% | 2749 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,201 psi | 85% | 2776 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,699 psi | 67% | 2654 fps | 98.1% |
| Rottweil R 902 | <<locked>> | 84% | 57,145 psi | 90% | 2635 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,377 psi | 90% | 2684 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,114 psi | 86% | 2690 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 98% | 55,303 psi | 87% | 2743 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 90% | 56,434 psi | 88% | 2677 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,723 psi | 86% | 2651 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 55,216 psi | 87% | 2625 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 56,043 psi | 88% | 2694 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,143 psi | 86% | 2694 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,318 psi | 88% | 2667 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,246 psi | 90% | 2562 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,679 psi | 86% | 2526 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,520 psi | 85% | 2608 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,824 psi | 86% | 2740 fps | 98.8% |
| Somchem S335 | <<locked>> | 82% | 56,956 psi | 89% | 2562 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 57,072 psi | 89% | 2677 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,898 psi | 89% | 2687 fps | 97.2% |
| Somchem S365 | <<locked>> | 94% | 53,896 psi | 84% | 2710 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,275 psi | 88% | 2723 fps | 99.4% |
| Unknown powder | <<locked>> | 90% | 55,361 psi | 87% | 2717 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 57,435 psi | 90% | 2543 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,682 psi | 90% | 2592 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,942 psi | 89% | 2602 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,303 psi | 87% | 2618 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,927 psi | 88% | 2687 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,111 psi | 79% | 2621 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 84% | 56,608 psi | 89% | 2628 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,144 psi | 88% | 2730 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,594 psi | 89% | 2769 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 53,606 psi | 84% | 2785 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,449 psi | 88% | 2674 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,014 psi | 88% | 2746 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,455 psi | 71% | 2756 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,346 psi | 85% | 2694 fps | 98.5% |
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% | 51,692 psi | 81% | 2520 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,440 psi | 70% | 2444 fps | 97.4% |
| Accurate 3100 | <<locked>> | 84% | 31,328 psi | 49% | 2274 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 49,008 psi | 77% | 2530 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,434 psi | 59% | 2418 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 80% | 46,224 psi | 72% | 2510 fps | 100% |
| ADI AR 2209 | <<locked>> | 88% | 41,307 psi | 65% | 2503 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 94% | 44,802 psi | 70% | 2595 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,923 psi | 80% | 2710 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,717 psi | 73% | 2533 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,937 psi | 78% | 2598 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,477 psi | 57% | 2425 fps | 98.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,234 psi | 65% | 2539 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 40,901 psi | 64% | 2500 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 38,479 psi | 60% | 2490 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,701 psi | 42% | 2201 fps | 97% |
| Alliant Reloder-25 | <<locked>> | 88% | 30,240 psi | 47% | 2313 fps | 95.1% |
| Alliant Reloder-26 | 57.3 gr | 80% | 28,413 psi | 45% | 2303 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 54,128 psi | 85% | 2661 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 40,437 psi | 63% | 2533 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 46,934 psi | 74% | 2543 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 38,479 psi | 60% | 2490 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 41,452 psi | 65% | 2428 fps | 96.9% |
| Hodgdon H380 | <<locked>> | 80% | 47,311 psi | 74% | 2552 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 42,540 psi | 67% | 2523 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 80% | 38,841 psi | 61% | 2408 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 98% | 47,224 psi | 74% | 2592 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 94% | 47,021 psi | 74% | 2589 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,910 psi | 53% | 2323 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,631 psi | 76% | 2595 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 37,942 psi | 59% | 2546 fps | 95.1% |
| Hodgdon Superformance | 59.1 gr | 80% | 38,218 psi | 60% | 2470 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,180 psi | 43% | 1460 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,675 psi | 76% | 2546 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,256 psi | 80% | 2566 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,411 psi | 71% | 2487 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,585 psi | 70% | 2464 fps | 98.1% |
| IMR 4350 | <<locked>> | 80% | 37,144 psi | 58% | 2362 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,757 psi | 67% | 2454 fps | 97.7% |
| IMR 4831 | <<locked>> | 80% | 32,648 psi | 51% | 2297 fps | 97.6% |
| IMR 4895 | <<locked>> | 80% | 51,242 psi | 80% | 2621 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 46,760 psi | 73% | 2549 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 94% | 45,774 psi | 72% | 2631 fps | 95.6% |
| Lovex S060 | <<locked>> | 80% | 53,185 psi | 83% | 2572 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,820 psi | 77% | 2536 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,364 psi | 63% | 2411 fps | 98.3% |
| Lovex S070 | <<locked>> | 80% | 38,638 psi | 61% | 2395 fps | 97% |
| Lovex S071 | <<locked>> | 90% | 32,605 psi | 51% | 2303 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 53,127 psi | 83% | 2589 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,838 psi | 84% | 2585 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,313 psi | 77% | 2585 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,553 psi | 65% | 2490 fps | 95.7% |
| Norma MRP | <<locked>> | 86% | 35,085 psi | 55% | 2444 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 37,159 psi | 58% | 2411 fps | 98.7% |
| Ramshot Big Game | <<locked>> | 80% | 49,371 psi | 77% | 2605 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 44,831 psi | 70% | 2625 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 35,955 psi | 56% | 2398 fps | 96.9% |
| Ramshot Magnum | <<locked>> | 92% | 38,783 psi | 61% | 2487 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,789 psi | 44% | 1496 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,340 psi | 74% | 2539 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,816 psi | 69% | 2589 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,985 psi | 58% | 2434 fps | 98.5% |
| ReloadSwiss RS 70 | 56.7 gr | 80% | 35,897 psi | 56% | 2438 fps | 97.9% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 37,318 psi | 58% | 2530 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 50,792 psi | 80% | 2546 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,338 psi | 69% | 2493 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 45,658 psi | 72% | 2536 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 88% | 39,842 psi | 62% | 2480 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 41,452 psi | 65% | 2428 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,364 psi | 63% | 2411 fps | 98.3% |
| Shooters World Precision | <<locked>> | 80% | 48,820 psi | 77% | 2536 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,638 psi | 61% | 2395 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,353 psi | 71% | 2546 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,794 psi | 83% | 2618 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,983 psi | 85% | 2523 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,658 psi | 72% | 2402 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,537 psi | 62% | 2359 fps | 97% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 39,465 psi | 62% | 2474 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 53,664 psi | 84% | 2520 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,585 psi | 70% | 2493 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 46,601 psi | 73% | 2526 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 33,634 psi | 53% | 2372 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 35,563 psi | 56% | 2362 fps | 95% |
| Unknown powder | <<locked>> | 80% | 40,089 psi | 63% | 2464 fps | 98.8% |
| Vihtavuori N133 | <<locked>> | 80% | 50,966 psi | 80% | 2461 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 51,053 psi | 80% | 2510 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,357 psi | 79% | 2513 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,392 psi | 60% | 2356 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,147 psi | 63% | 2438 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 92% | 38,609 psi | 61% | 2418 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 49,908 psi | 78% | 2539 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,596 psi | 64% | 2477 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 80% | 29,370 psi | 46% | 2270 fps | 97% |
| Vihtavuori N560 | <<locked>> | 96% | 47,065 psi | 74% | 2674 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,565 psi | 59% | 2379 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 42,540 psi | 67% | 2523 fps | 97.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,569 psi | 37% | 2172 fps | 95.6% |
| Winchester Supreme 780 | <<locked>> | 88% | 40,944 psi | 64% | 2470 fps | 95.6% |
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 98 powders for .300 WSM loaded with the .308 | 200gr | Speer Grand Slam. Norma MRP delivers the highest muzzle velocity at 2,844 fps; across all powders the maximum-charge window runs from 1,637 fps to 2,844 fps. Accurate 3100 gives the best case fill at 100 %, and 98 of the 98 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 200.0 gr projectile in 0.308" calls for a 1:14.5 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. ReloadSwiss RS 70, Alliant Reloder-26, Hodgdon Superformance rank at the top here: for .300 WSM with the .308 | 200gr | 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.