Load Specifications
Bullet:.308 | 180gr | Barnes MRX BT
Bullet Manufacturer:Barnes
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:1:11.5
Load data in caliber .300 WSM with .308 | 180gr | Barnes MRX BT bullet and 105 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% | 54,723 psi | 86% | 2664 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 57,087 psi | 89% | 2733 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 57,551 psi | 90% | 2792 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 57,551 psi | 90% | 2792 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 57,566 psi | 90% | 2762 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 44,353 psi | 70% | 2657 fps | 97.8% |
| Accurate 4064 | <<locked>> | 90% | 57,392 psi | 90% | 2785 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 54,172 psi | 85% | 2835 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 86% | 57,711 psi | 90% | 2825 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 55,172 psi | 86% | 2776 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 52,417 psi | 82% | 2815 fps | 96.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 56,507 psi | 89% | 2772 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,201 psi | 85% | 2694 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 54,128 psi | 85% | 2894 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 51,996 psi | 81% | 2812 fps | 96.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,463 psi | 87% | 2795 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 56,057 psi | 88% | 2822 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 55,288 psi | 87% | 2890 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 56,637 psi | 89% | 2920 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 51,227 psi | 80% | 2802 fps | 96.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,366 psi | 66% | 2690 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 37,115 psi | 58% | 2592 fps | 96.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,587 psi | 75% | 2861 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 53,998 psi | 85% | 2789 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 56,173 psi | 88% | 2812 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 56,014 psi | 88% | 2792 fps | 98.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,578 psi | 86% | 2703 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 56,086 psi | 88% | 2802 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 56,608 psi | 89% | 2749 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 57,014 psi | 89% | 2828 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 54,781 psi | 86% | 2854 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 96% | 55,303 psi | 87% | 2818 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 84% | 54,694 psi | 86% | 2782 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 55,463 psi | 87% | 2815 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,665 psi | 86% | 2818 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 53,534 psi | 84% | 2867 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,752 psi | 56% | 1699 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 54,853 psi | 86% | 2769 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 57,087 psi | 89% | 2785 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 57,537 psi | 90% | 2795 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 92% | 56,550 psi | 89% | 2772 fps | 98.8% |
| IMR 4350 | <<locked>> | 98% | 56,521 psi | 89% | 2818 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 92% | 54,447 psi | 85% | 2769 fps | 98.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,808 psi | 81% | 2782 fps | 99.8% |
| IMR 4895 | <<locked>> | 88% | 57,522 psi | 90% | 2848 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 56,507 psi | 89% | 2772 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 53,838 psi | 84% | 2743 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,942 psi | 89% | 2749 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 54,491 psi | 85% | 2749 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 57,217 psi | 90% | 2808 fps | 99.6% |
| Lovex S070 | <<locked>> | 96% | 54,882 psi | 86% | 2799 fps | 98.8% |
| Norma 201 | <<locked>> | 86% | 56,188 psi | 88% | 2766 fps | 100% |
| Norma 202 | <<locked>> | 86% | 56,971 psi | 89% | 2762 fps | 100% |
| Norma 203B | <<locked>> | 88% | 55,245 psi | 87% | 2805 fps | 100% |
| Norma 204 | <<locked>> | 98% | 57,421 psi | 90% | 2871 fps | 97.6% |
| Norma MRPᴾ | <<locked>> | 100% | 47,340 psi | 74% | 2815 fps | 97.5% |
| Norma URP | <<locked>> | 98% | 56,884 psi | 89% | 2874 fps | 100% |
| Ramshot Big Game | <<locked>> | 88% | 55,854 psi | 88% | 2831 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 55,622 psi | 87% | 2874 fps | 99.4% |
| Ramshot TAC | <<locked>> | 84% | 56,739 psi | 89% | 2799 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 84% | 56,637 psi | 89% | 2812 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 57,392 psi | 90% | 2776 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,230 psi | 57% | 1739 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 57,334 psi | 90% | 2815 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 56,884 psi | 89% | 2887 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 56,434 psi | 88% | 2920 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 53,911 psi | 84% | 2858 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 57,232 psi | 90% | 2946 fps | 100% |
| Rottweil R 901 | <<locked>> | 84% | 56,840 psi | 89% | 2740 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,579 psi | 89% | 2762 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 56,043 psi | 88% | 2805 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 54,070 psi | 85% | 2789 fps | 96% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 50,299 psi | 79% | 2785 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 94% | 56,014 psi | 88% | 2792 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 96% | 57,217 psi | 90% | 2808 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 84% | 53,838 psi | 84% | 2743 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 54,491 psi | 85% | 2749 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 54,882 psi | 86% | 2799 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 54,244 psi | 85% | 2815 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,216 psi | 87% | 2776 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 56,159 psi | 88% | 2799 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 57,653 psi | 90% | 2700 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 54,636 psi | 86% | 2654 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 57,624 psi | 90% | 2769 fps | 98.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 49,806 psi | 78% | 2782 fps | 96.6% |
| Somchem S335 | <<locked>> | 86% | 57,014 psi | 89% | 2697 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 55,027 psi | 86% | 2766 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 56,086 psi | 88% | 2799 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 55,230 psi | 87% | 2874 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,720 psi | 79% | 2762 fps | 97.6% |
| Unknown powder | <<locked>> | 94% | 54,201 psi | 85% | 2828 fps | 99.7% |
| Vihtavuori N130 | <<locked>> | 82% | 56,130 psi | 88% | 2644 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 57,421 psi | 90% | 2677 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 56,840 psi | 89% | 2723 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,811 psi | 89% | 2736 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 57,595 psi | 90% | 2779 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,607 psi | 86% | 2799 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 82% | 56,130 psi | 88% | 2776 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 56,434 psi | 88% | 2762 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,911 psi | 86% | 2844 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,862 psi | 73% | 2762 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 55,898 psi | 88% | 2795 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,781 psi | 86% | 2854 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,695 psi | 59% | 2710 fps | 99.9% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,142 psi | 83% | 2789 fps | 96.9% |
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% | 51,474 psi | 81% | 2618 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,816 psi | 69% | 2549 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,096 psi | 79% | 2690 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,096 psi | 79% | 2690 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 44,063 psi | 69% | 2546 fps | 95.8% |
| Accurate 3100 | <<locked>> | 94% | 35,969 psi | 56% | 2493 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 41,510 psi | 65% | 2549 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 30,676 psi | 48% | 2382 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 47,529 psi | 74% | 2667 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 40,408 psi | 63% | 2523 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 96% | 45,847 psi | 72% | 2700 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,705 psi | 78% | 2671 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,821 psi | 80% | 2648 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,772 psi | 69% | 2717 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 45,803 psi | 72% | 2703 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,277 psi | 63% | 2546 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,120 psi | 68% | 2608 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,169 psi | 49% | 2402 fps | 95.5% |
| Alliant Reloder-17 | 53.7 gr | 80% | 34,766 psi | 54% | 2523 fps | 98.6% |
| Alliant Reloder-19 | <<locked>> | 96% | 45,194 psi | 71% | 2694 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 86% | 27,035 psi | 42% | 2313 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 98% | 34,766 psi | 54% | 2533 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 90% | 33,272 psi | 52% | 2543 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,050 psi | 74% | 2677 fps | 99.4% |
| Bofors RP3 | <<locked>> | 80% | 40,016 psi | 63% | 2549 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 40,770 psi | 64% | 2526 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,459 psi | 81% | 2657 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,008 psi | 77% | 2697 fps | 100% |
| Hodgdon H322 | <<locked>> | 80% | 52,924 psi | 83% | 2700 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,654 psi | 64% | 2556 fps | 97.9% |
| Hodgdon H414 | <<locked>> | 82% | 38,638 psi | 61% | 2562 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 90% | 45,963 psi | 72% | 2661 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 80% | 48,051 psi | 75% | 2677 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,616 psi | 45% | 2306 fps | 96.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,640 psi | 65% | 2605 fps | 99.8% |
| Hodgdon Superformance | 61.1 gr | 86% | 40,190 psi | 63% | 2621 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,643 psi | 42% | 1519 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,830 psi | 67% | 2572 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 44,179 psi | 69% | 2602 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,682 psi | 62% | 2500 fps | 98.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 39,378 psi | 62% | 2470 fps | 95.3% |
| IMR 4350 | <<locked>> | 88% | 41,307 psi | 65% | 2559 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 82% | 39,914 psi | 63% | 2507 fps | 95.3% |
| IMR 4831 | <<locked>> | 84% | 30,922 psi | 48% | 2372 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 44,237 psi | 69% | 2638 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 49,705 psi | 78% | 2671 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,094 psi | 74% | 2644 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,253 psi | 74% | 2602 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 42,308 psi | 66% | 2556 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 34,722 psi | 54% | 2402 fps | 95.2% |
| Lovex S070 | <<locked>> | 86% | 40,001 psi | 63% | 2536 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 46,427 psi | 73% | 2618 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,021 psi | 74% | 2621 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,482 psi | 67% | 2595 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 46,644 psi | 73% | 2700 fps | 95.3% |
| Norma MRP | <<locked>> | 96% | 41,379 psi | 65% | 2697 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 31,241 psi | 49% | 2392 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 42,467 psi | 67% | 2615 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 37,260 psi | 58% | 2543 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 49,617 psi | 78% | 2687 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,356 psi | 77% | 2703 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,650 psi | 84% | 2723 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,948 psi | 42% | 1555 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,118 psi | 64% | 2543 fps | 96.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,093 psi | 72% | 2717 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,043 psi | 58% | 2585 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 32,779 psi | 51% | 2457 fps | 95.7% |
| ReloadSwiss RS 70 | 57.3 gr | 84% | 35,070 psi | 55% | 2523 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 50,430 psi | 79% | 2648 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,193 psi | 69% | 2569 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 37,637 psi | 59% | 2497 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 98% | 50,865 psi | 80% | 2736 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 96% | 43,787 psi | 69% | 2674 fps | 95% |
| Rottweil R 907 | <<locked>> | 84% | 40,770 psi | 64% | 2526 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,722 psi | 54% | 2402 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,094 psi | 74% | 2644 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,308 psi | 66% | 2556 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 40,001 psi | 63% | 2536 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,754 psi | 61% | 2546 fps | 98.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,153 psi | 75% | 2664 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,122 psi | 72% | 2641 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,659 psi | 75% | 2562 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,813 psi | 62% | 2434 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 38,769 psi | 61% | 2451 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 46,456 psi | 73% | 2723 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 47,326 psi | 74% | 2562 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,848 psi | 75% | 2657 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 38,276 psi | 60% | 2500 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 27,920 psi | 44% | 2343 fps | 97.5% |
| Somchem S385 | <<locked>> | 94% | 41,669 psi | 65% | 2602 fps | 95.4% |
| Unknown powder | <<locked>> | 80% | 33,866 psi | 53% | 2444 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 52,837 psi | 83% | 2602 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,194 psi | 71% | 2510 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,932 psi | 69% | 2543 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,903 psi | 69% | 2549 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,634 psi | 51% | 2356 fps | 99% |
| Vihtavuori N160 | <<locked>> | 80% | 33,939 psi | 53% | 2425 fps | 96.3% |
| Vihtavuori N530 | <<locked>> | 80% | 52,518 psi | 82% | 2723 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,598 psi | 68% | 2569 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,301 psi | 54% | 2461 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 86% | 29,138 psi | 46% | 2385 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,184 psi | 50% | 2369 fps | 97.9% |
| Winchester 760 | <<locked>> | 82% | 38,638 psi | 61% | 2562 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 27,021 psi | 42% | 2385 fps | 95.7% |
| Winchester Supreme 780 | <<locked>> | 96% | 45,934 psi | 72% | 2667 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 105 powders for .300 WSM loaded with the .308 | 180gr | Barnes MRX BT. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,946 fps; across all powders the maximum-charge window runs from 1,699 fps to 2,946 fps. Accurate 3100 gives the best case fill at 100 %, and 105 of the 105 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 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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 | 180gr | Barnes MRX BT 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.