Load Specifications
Bullet Manufacturer:MRR
Bullet Weight:158 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 | 158gr | MRR Green Sport bullet and 103 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 and Alliant Power Pro 2000-MR.
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>> | 86% | 57,479 psi | 90% | 2884 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,883 psi | 88% | 2913 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 55,883 psi | 88% | 2907 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,550 psi | 89% | 2966 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 56,797 psi | 89% | 2913 fps | 97.1% |
| Accurate 4064 | <<locked>> | 92% | 55,709 psi | 87% | 2953 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 56,260 psi | 88% | 3045 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 88% | 56,681 psi | 89% | 2992 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 54,447 psi | 85% | 2940 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 55,709 psi | 87% | 2940 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 56,637 psi | 89% | 2917 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 57,653 psi | 90% | 3054 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 56,869 psi | 89% | 3120 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 57,667 psi | 90% | 3009 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 57,000 psi | 89% | 2887 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 54,752 psi | 86% | 2979 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,041 psi | 85% | 3048 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 96% | 55,187 psi | 86% | 3084 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,145 psi | 60% | 2759 fps | 98.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,656 psi | 67% | 2920 fps | 97.4% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 56,869 psi | 89% | 3009 fps | 99.7% |
| Bofors RP3 | <<locked>> | 92% | 54,723 psi | 86% | 2976 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 55,027 psi | 86% | 2943 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 86% | 57,609 psi | 90% | 2927 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 55,216 psi | 87% | 2972 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 57,493 psi | 90% | 3081 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 84% | 55,680 psi | 87% | 2927 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 55,738 psi | 87% | 2986 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 96% | 57,479 psi | 90% | 3071 fps | 98.1% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 57,609 psi | 90% | 3022 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 88% | 57,246 psi | 90% | 3002 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,980 psi | 78% | 2913 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 56,811 psi | 89% | 3035 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 56,608 psi | 89% | 3081 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,346 psi | 55% | 1814 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 57,537 psi | 90% | 2989 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 55,550 psi | 87% | 2959 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 56,565 psi | 89% | 2963 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 94% | 56,057 psi | 88% | 2933 fps | 97.7% |
| IMR 4198 | <<locked>> | 82% | 57,058 psi | 89% | 2848 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 55,347 psi | 87% | 2969 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 96% | 57,087 psi | 89% | 2979 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 46,949 psi | 74% | 2874 fps | 98.6% |
| IMR 4895 | <<locked>> | 90% | 56,173 psi | 88% | 3012 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 55,709 psi | 87% | 2940 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 55,753 psi | 87% | 2923 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 56,550 psi | 89% | 2966 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 56,391 psi | 88% | 2920 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 56,927 psi | 89% | 2969 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 56,289 psi | 88% | 2969 fps | 98.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 57,043 psi | 89% | 3002 fps | 98.1% |
| Norma 201 | <<locked>> | 88% | 55,288 psi | 87% | 2933 fps | 100% |
| Norma 202 | <<locked>> | 88% | 55,985 psi | 88% | 2936 fps | 100% |
| Norma 203B | <<locked>> | 92% | 57,508 psi | 90% | 3022 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 56,275 psi | 88% | 3022 fps | 96% |
| Norma URPᴾ | <<locked>> | 100% | 54,998 psi | 86% | 3028 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 90% | 54,824 psi | 86% | 2995 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,099 psi | 85% | 3025 fps | 98.3% |
| Ramshot TAC | <<locked>> | 86% | 56,188 psi | 88% | 2963 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 86% | 55,883 psi | 88% | 2982 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 56,739 psi | 89% | 2943 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,694 psi | 56% | 1857 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,303 psi | 87% | 2923 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 56,449 psi | 88% | 2972 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 55,332 psi | 87% | 3051 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 54,882 psi | 86% | 3087 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 56,014 psi | 88% | 3068 fps | 99.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 55,811 psi | 87% | 3097 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 86% | 55,927 psi | 88% | 2913 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 55,695 psi | 87% | 2930 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 54,592 psi | 86% | 2966 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 55,027 psi | 86% | 2943 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 98% | 56,289 psi | 88% | 2969 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 88% | 56,550 psi | 89% | 2966 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 56,927 psi | 89% | 2969 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 57,043 psi | 89% | 3002 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 56,550 psi | 89% | 3031 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 54,462 psi | 85% | 2936 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 55,259 psi | 87% | 2963 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 57,000 psi | 89% | 2874 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 57,305 psi | 90% | 2867 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 56,782 psi | 89% | 2920 fps | 97.8% |
| Somchem S321 | <<locked>> | 84% | 57,174 psi | 90% | 2976 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 56,304 psi | 88% | 2871 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 54,201 psi | 85% | 2930 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 54,868 psi | 86% | 2963 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 49,443 psi | 77% | 2976 fps | 100% |
| Unknown powder | <<locked>> | 98% | 56,507 psi | 89% | 3041 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 84% | 55,651 psi | 87% | 2825 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 56,637 psi | 89% | 2854 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 55,666 psi | 87% | 2897 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,738 psi | 87% | 2904 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 56,376 psi | 88% | 2943 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 57,174 psi | 90% | 3009 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 55,390 psi | 87% | 2946 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,521 psi | 87% | 2933 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 57,058 psi | 89% | 3054 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,742 psi | 65% | 2838 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 54,694 psi | 86% | 2949 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 57,058 psi | 89% | 3002 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 57,479 psi | 90% | 3071 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,127 psi | 53% | 2746 fps | 97.8% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,652 psi | 89% | 2992 fps | 100% |
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% | 47,674 psi | 75% | 2743 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,083 psi | 82% | 2858 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,842 psi | 62% | 2654 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,847 psi | 72% | 2802 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 49,748 psi | 78% | 2802 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 37,710 psi | 59% | 2644 fps | 99.9% |
| Accurate 4350 | <<locked>> | 86% | 33,953 psi | 53% | 2618 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 43,859 psi | 69% | 2769 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 80% | 37,318 psi | 58% | 2615 fps | 96.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,992 psi | 72% | 2782 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 46,209 psi | 72% | 2769 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 53,940 psi | 85% | 2995 fps | 100% |
| Alliant Power Pro 2000-MR | 55.5 gr | 80% | 39,900 psi | 63% | 2795 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,869 psi | 58% | 2638 fps | 98.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 53,621 psi | 84% | 2841 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,537 psi | 62% | 2700 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 34,621 psi | 54% | 2641 fps | 95.2% |
| Alliant Reloder-17 | 54.7 gr | 80% | 31,749 psi | 50% | 2592 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 31,575 psi | 49% | 2585 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 36,912 psi | 58% | 2782 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,250 psi | 68% | 2772 fps | 97.9% |
| Bofors RP3 | <<locked>> | 80% | 36,303 psi | 57% | 2635 fps | 98.1% |
| Bofors RP7 | <<locked>> | 92% | 48,341 psi | 76% | 2828 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,732 psi | 75% | 2772 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,744 psi | 70% | 2802 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 49,647 psi | 78% | 2953 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 80% | 48,979 psi | 77% | 2825 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 37,318 psi | 58% | 2641 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 90% | 46,456 psi | 73% | 2881 fps | 95.9% |
| Hodgdon H4350 | <<locked>> | 96% | 50,923 psi | 80% | 2913 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 44,251 psi | 69% | 2782 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,530 psi | 46% | 2474 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,029 psi | 60% | 2700 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 94% | 48,805 psi | 76% | 2946 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,237 psi | 41% | 1621 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,349 psi | 62% | 2667 fps | 98.4% |
| IMR 3031 | <<locked>> | 80% | 40,176 psi | 63% | 2710 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,448 psi | 57% | 2589 fps | 96.7% |
| IMR 4166 Enduron | <<locked>> | 86% | 43,961 psi | 69% | 2717 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 53,693 psi | 84% | 2802 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 48,704 psi | 76% | 2858 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 44,599 psi | 70% | 2759 fps | 95.1% |
| IMR 4831 | <<locked>> | 90% | 34,026 psi | 53% | 2602 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 40,509 psi | 63% | 2733 fps | 98.3% |
| IMR 8208 XBR | <<locked>> | 80% | 45,992 psi | 72% | 2782 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 52,025 psi | 82% | 2867 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,873 psi | 67% | 2749 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,019 psi | 69% | 2710 fps | 98.9% |
| Lovex S062 | <<locked>> | 80% | 38,914 psi | 61% | 2654 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 41,118 psi | 64% | 2697 fps | 95.8% |
| Lovex S070 | <<locked>> | 92% | 44,295 psi | 69% | 2779 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 42,859 psi | 67% | 2723 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 43,337 psi | 68% | 2733 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,914 psi | 61% | 2687 fps | 97.9% |
| Norma 204 | <<locked>> | 98% | 52,373 psi | 82% | 2956 fps | 95.1% |
| Norma URP | <<locked>> | 86% | 34,534 psi | 54% | 2625 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 38,537 psi | 60% | 2700 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 92% | 41,350 psi | 65% | 2785 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 46,006 psi | 72% | 2785 fps | 97.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,513 psi | 71% | 2805 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,661 psi | 78% | 2831 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,440 psi | 41% | 1657 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,590 psi | 81% | 2867 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 43,134 psi | 68% | 2736 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,655 psi | 65% | 2805 fps | 98% |
| ReloadSwiss RS 60 | 54.7 gr | 80% | 33,895 psi | 53% | 2664 fps | 99% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 36,506 psi | 57% | 2700 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 39,421 psi | 62% | 2772 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 46,615 psi | 73% | 2766 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,843 psi | 64% | 2674 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 34,142 psi | 54% | 2575 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 92% | 48,341 psi | 76% | 2828 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,118 psi | 64% | 2697 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,873 psi | 67% | 2749 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,914 psi | 61% | 2654 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 92% | 44,295 psi | 69% | 2779 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,215 psi | 55% | 2628 fps | 96.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,106 psi | 69% | 2756 fps | 97.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,424 psi | 66% | 2740 fps | 98.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,396 psi | 70% | 2680 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,854 psi | 58% | 2539 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 43,526 psi | 68% | 2697 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 49,879 psi | 78% | 2864 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 43,932 psi | 69% | 2680 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,019 psi | 69% | 2756 fps | 98.8% |
| Somchem S355 | <<locked>> | 80% | 35,027 psi | 55% | 2585 fps | 97.3% |
| Somchem S365 | <<locked>> | 82% | 26,905 psi | 42% | 2451 fps | 95.2% |
| Unknown powder | <<locked>> | 86% | 37,681 psi | 59% | 2690 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 49,139 psi | 77% | 2730 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,800 psi | 66% | 2628 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,277 psi | 63% | 2657 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,408 psi | 63% | 2657 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 29,820 psi | 47% | 2434 fps | 96.9% |
| Vihtavuori N160 | <<locked>> | 84% | 35,404 psi | 55% | 2608 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 48,530 psi | 76% | 2838 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 40,089 psi | 63% | 2674 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,694 psi | 56% | 2651 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 94% | 33,895 psi | 53% | 2661 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,602 psi | 46% | 2438 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 49,545 psi | 78% | 2887 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 46,456 psi | 73% | 2881 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 29,863 psi | 47% | 2605 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,620 psi | 82% | 2933 fps | 99.9% |
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 103 powders for .300 WSM loaded with the .308 | 158gr | MRR Green Sport. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,120 fps; across all powders the maximum-charge window runs from 1,814 fps to 3,120 fps. Accurate 4350 gives the best case fill at 100 %, and 103 of the 103 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 158.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, 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. ReloadSwiss RS 60, Alliant Reloder-17, Alliant Power Pro 2000-MR rank at the top here: for .300 WSM with the .308 | 158gr | MRR Green Sport 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.