Load Specifications
Bullet:.308 | 165gr | Barnes MRX BT
Bullet Manufacturer:Barnes
Bullet Weight:165 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:1:12.0
Load data in caliber .300 WSM with .308 | 165gr | Barnes MRX BT 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 Power Pro 2000-MR, 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.
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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 2015 | <<locked>> | 84% | 55,651 psi | 87% | 2799 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 57,566 psi | 90% | 2874 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 57,464 psi | 90% | 2864 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,418 psi | 85% | 2874 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 54,665 psi | 86% | 2828 fps | 97.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 41,292 psi | 65% | 2707 fps | 96.1% |
| Accurate 4064 | <<locked>> | 92% | 57,580 psi | 90% | 2917 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,215 psi | 85% | 2956 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 86% | 54,752 psi | 86% | 2904 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 56,043 psi | 88% | 2907 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,276 psi | 90% | 2904 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,592 psi | 86% | 2825 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,520 psi | 85% | 3025 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,782 psi | 87% | 2923 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,434 psi | 88% | 2946 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,593 psi | 87% | 3015 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 96% | 57,246 psi | 90% | 3054 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,566 psi | 62% | 2743 fps | 99% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,454 psi | 70% | 2910 fps | 98.4% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,810 psi | 86% | 2920 fps | 99.7% |
| Bofors RP3 | <<locked>> | 92% | 56,666 psi | 89% | 2943 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,739 psi | 89% | 2917 fps | 97.8% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,506 psi | 87% | 2835 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,956 psi | 89% | 2936 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,143 psi | 86% | 2982 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 84% | 57,261 psi | 90% | 2884 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 57,595 psi | 90% | 2956 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 94% | 55,216 psi | 87% | 2979 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 98% | 55,811 psi | 87% | 2940 fps | 97% |
| Hodgdon H4895 | <<locked>> | 86% | 55,303 psi | 87% | 2913 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,895 psi | 81% | 2887 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,071 psi | 86% | 2949 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,346 psi | 85% | 2992 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,476 psi | 56% | 1778 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,506 psi | 87% | 2900 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 57,363 psi | 90% | 2920 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 54,549 psi | 85% | 2874 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 94% | 57,319 psi | 90% | 2897 fps | 98.3% |
| IMR 4350ᴾ | <<locked>> | 100% | 57,174 psi | 90% | 2943 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,187 psi | 86% | 2894 fps | 97.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 48,791 psi | 76% | 2851 fps | 99.2% |
| IMR 4895 | <<locked>> | 88% | 54,317 psi | 85% | 2927 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 57,276 psi | 90% | 2904 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 57,479 psi | 90% | 2887 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,418 psi | 85% | 2874 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,331 psi | 85% | 2831 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 55,027 psi | 86% | 2881 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,491 psi | 85% | 2884 fps | 98.9% |
| Lovex S070 | <<locked>> | 98% | 55,288 psi | 87% | 2920 fps | 98.2% |
| Norma 201 | <<locked>> | 88% | 56,898 psi | 89% | 2897 fps | 100% |
| Norma 202 | <<locked>> | 88% | 57,653 psi | 90% | 2897 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,608 psi | 87% | 2933 fps | 100% |
| Norma 204 | <<locked>> | 98% | 54,215 psi | 85% | 2933 fps | 96.1% |
| Norma URPᴾ | <<locked>> | 100% | 57,058 psi | 89% | 2999 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 90% | 56,434 psi | 88% | 2959 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,869 psi | 88% | 2995 fps | 98.9% |
| Ramshot TAC | <<locked>> | 84% | 54,085 psi | 85% | 2874 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 86% | 57,319 psi | 90% | 2943 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,549 psi | 85% | 2854 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,882 psi | 56% | 1818 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,797 psi | 89% | 2884 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,360 psi | 85% | 2887 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 57,334 psi | 90% | 3022 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,884 psi | 89% | 3051 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,230 psi | 85% | 2979 fps | 99.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 57,566 psi | 90% | 3068 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 86% | 57,450 psi | 90% | 2871 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 57,261 psi | 90% | 2894 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,521 psi | 89% | 2933 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,739 psi | 89% | 2917 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,491 psi | 85% | 2884 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,418 psi | 85% | 2874 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,027 psi | 86% | 2881 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,288 psi | 87% | 2920 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,810 psi | 86% | 2943 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,159 psi | 88% | 2907 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,884 psi | 89% | 2930 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,042 psi | 86% | 2789 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,434 psi | 87% | 2785 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,549 psi | 85% | 2835 fps | 97.9% |
| Somchem S321 | <<locked>> | 82% | 54,998 psi | 86% | 2884 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,273 psi | 85% | 2782 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,883 psi | 88% | 2897 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 56,666 psi | 89% | 2930 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,517 psi | 81% | 2946 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 47,601 psi | 75% | 2818 fps | 96% |
| Unknown powder | <<locked>> | 96% | 54,505 psi | 85% | 2953 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 84% | 57,029 psi | 89% | 2779 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 54,781 psi | 86% | 2766 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 57,116 psi | 90% | 2854 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 57,421 psi | 90% | 2867 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 54,491 psi | 85% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 55,143 psi | 86% | 2923 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 56,956 psi | 89% | 2910 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 57,159 psi | 90% | 2897 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 55,390 psi | 87% | 2972 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,410 psi | 68% | 2815 fps | 98.8% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,594 psi | 89% | 2923 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,882 psi | 86% | 2910 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,216 psi | 87% | 2979 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,273 psi | 55% | 2740 fps | 98.8% |
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 2015 | <<locked>> | 80% | 49,023 psi | 77% | 2707 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 53,650 psi | 84% | 2822 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,249 psi | 65% | 2621 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,181 psi | 74% | 2766 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 47,848 psi | 75% | 2717 fps | 95.7% |
| Accurate 3100 | <<locked>> | 98% | 38,421 psi | 60% | 2648 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 39,030 psi | 61% | 2618 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 32,895 psi | 52% | 2543 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 45,136 psi | 71% | 2740 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 38,392 psi | 60% | 2585 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,282 psi | 74% | 2746 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 47,732 psi | 75% | 2730 fps | 100% |
| Alliant Power Pro 2000-MR | 55.3 gr | 80% | 41,191 psi | 65% | 2772 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,043 psi | 60% | 2608 fps | 98.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,785 psi | 64% | 2674 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,460 psi | 52% | 2562 fps | 95.3% |
| Alliant Reloder-17 | 54.5 gr | 80% | 32,837 psi | 51% | 2575 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,647 psi | 48% | 2513 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,737 psi | 56% | 2707 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,628 psi | 70% | 2746 fps | 98.5% |
| Bofors RP3 | <<locked>> | 80% | 37,594 psi | 59% | 2612 fps | 98.8% |
| Bofors RP7 | <<locked>> | 90% | 46,702 psi | 73% | 2746 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,936 psi | 77% | 2736 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,209 psi | 72% | 2769 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,358 psi | 80% | 2923 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 80% | 50,357 psi | 79% | 2785 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,537 psi | 60% | 2615 fps | 96.5% |
| Hodgdon H414 | <<locked>> | 86% | 41,727 psi | 65% | 2733 fps | 95% |
| Hodgdon H4350 | <<locked>> | 94% | 49,313 psi | 77% | 2831 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 45,556 psi | 71% | 2749 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,689 psi | 45% | 2402 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,349 psi | 62% | 2674 fps | 99.1% |
| Hodgdon Superformance | 64.8 gr | 90% | 43,671 psi | 68% | 2795 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,310 psi | 41% | 1585 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,524 psi | 64% | 2638 fps | 98.9% |
| IMR 3031 | <<locked>> | 80% | 41,495 psi | 65% | 2677 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,492 psi | 59% | 2559 fps | 97.5% |
| IMR 4166 Enduron | <<locked>> | 84% | 42,351 psi | 66% | 2635 fps | 95.1% |
| IMR 4350 | <<locked>> | 92% | 44,237 psi | 69% | 2720 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,091 psi | 68% | 2677 fps | 95.2% |
| IMR 4831 | <<locked>> | 88% | 33,011 psi | 52% | 2526 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 41,785 psi | 65% | 2703 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 47,282 psi | 74% | 2746 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 53,577 psi | 84% | 2831 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,324 psi | 69% | 2717 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,150 psi | 71% | 2677 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 40,132 psi | 63% | 2621 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 37,260 psi | 58% | 2562 fps | 95.1% |
| Lovex S070 | <<locked>> | 90% | 42,931 psi | 67% | 2703 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 44,092 psi | 69% | 2690 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 44,628 psi | 70% | 2700 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,147 psi | 63% | 2661 fps | 98.6% |
| Norma 204 | <<locked>> | 96% | 50,444 psi | 79% | 2871 fps | 95.2% |
| Norma URP | <<locked>> | 84% | 33,431 psi | 52% | 2549 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 39,885 psi | 63% | 2677 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 90% | 39,929 psi | 63% | 2703 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 47,297 psi | 74% | 2756 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,920 psi | 74% | 2779 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,039 psi | 80% | 2799 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,556 psi | 42% | 1621 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,011 psi | 83% | 2828 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,698 psi | 65% | 2657 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,192 psi | 68% | 2779 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,998 psi | 55% | 2644 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 35,288 psi | 55% | 2621 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 37,855 psi | 59% | 2690 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 47,863 psi | 75% | 2726 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,018 psi | 66% | 2644 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 35,346 psi | 55% | 2552 fps | 98% |
| Rottweil R 907 | <<locked>> | 90% | 46,702 psi | 73% | 2746 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,260 psi | 58% | 2562 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,324 psi | 69% | 2717 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,132 psi | 63% | 2621 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 42,931 psi | 67% | 2703 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,419 psi | 57% | 2605 fps | 97.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,513 psi | 71% | 2730 fps | 98.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,700 psi | 68% | 2707 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,542 psi | 71% | 2641 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,898 psi | 59% | 2507 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 41,829 psi | 66% | 2615 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 51,358 psi | 80% | 2831 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,121 psi | 71% | 2641 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,426 psi | 71% | 2730 fps | 99.3% |
| Somchem S355 | <<locked>> | 80% | 36,158 psi | 57% | 2559 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 26,049 psi | 41% | 2375 fps | 95.3% |
| Somchem S385 | <<locked>> | 98% | 44,541 psi | 70% | 2762 fps | 95.1% |
| Unknown powder | <<locked>> | 84% | 36,477 psi | 57% | 2608 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 50,357 psi | 79% | 2687 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,946 psi | 67% | 2589 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,553 psi | 65% | 2621 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,626 psi | 65% | 2625 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 30,835 psi | 48% | 2411 fps | 97.7% |
| Vihtavuori N160 | <<locked>> | 82% | 34,084 psi | 53% | 2526 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 49,908 psi | 78% | 2802 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,307 psi | 65% | 2641 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 34,592 psi | 54% | 2572 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 90% | 30,980 psi | 49% | 2536 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,530 psi | 48% | 2418 fps | 96.2% |
| Winchester 748 | <<locked>> | 80% | 51,169 psi | 80% | 2854 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 41,727 psi | 65% | 2733 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 94% | 28,906 psi | 45% | 2533 fps | 95.3% |
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 | 165gr | Barnes MRX BT. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,068 fps; across all powders the maximum-charge window runs from 1,778 fps to 3,068 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 55–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-16, Alliant Reloder-23 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 Power Pro 2000-MR, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .300 WSM with the .308 | 165gr | 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.