Load Specifications
Bullet:.308 | 150gr | Hornady ECX
Bullet Manufacturer:Hornady
Bullet Weight:150 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 | 150gr | Hornady ECX bullet and 103 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 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% | 56,637 psi | 89% | 2953 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,085 psi | 86% | 2979 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,926 psi | 86% | 2972 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,521 psi | 87% | 3031 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 56,115 psi | 88% | 2976 fps | 96.5% |
| Accurate 4064 | <<locked>> | 92% | 54,940 psi | 86% | 3022 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 55,245 psi | 87% | 3104 fps | 99.3% |
| ADI AR 2206H | <<locked>> | 88% | 55,854 psi | 88% | 3058 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 94% | 57,058 psi | 89% | 3058 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,998 psi | 86% | 3009 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 55,579 psi | 87% | 2986 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 56,826 psi | 89% | 3127 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,883 psi | 88% | 3182 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 56,869 psi | 89% | 3081 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 56,072 psi | 88% | 2959 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 57,551 psi | 90% | 3104 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 53,040 psi | 83% | 3107 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 96% | 54,244 psi | 85% | 3150 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,550 psi | 59% | 2808 fps | 97.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,090 psi | 66% | 2972 fps | 96.7% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 56,014 psi | 88% | 3074 fps | 99.5% |
| Bofors RP3 | <<locked>> | 94% | 57,522 psi | 90% | 3094 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 54,230 psi | 85% | 3002 fps | 96.4% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,724 psi | 89% | 2992 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 54,172 psi | 85% | 3035 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 56,405 psi | 88% | 3143 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 84% | 54,868 psi | 86% | 2995 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,897 psi | 86% | 3051 fps | 99% |
| Hodgdon H414 | <<locked>> | 96% | 56,463 psi | 88% | 3130 fps | 97.6% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 56,826 psi | 89% | 3087 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 88% | 56,405 psi | 88% | 3071 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,211 psi | 77% | 2976 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 55,912 psi | 88% | 3100 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 55,608 psi | 87% | 3136 fps | 97% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,157 psi | 55% | 1870 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 56,652 psi | 89% | 3054 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 54,824 psi | 86% | 3031 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 55,695 psi | 87% | 3028 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 94% | 55,216 psi | 87% | 2995 fps | 97.2% |
| IMR 4198 | <<locked>> | 82% | 56,391 psi | 88% | 2920 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 54,563 psi | 86% | 3028 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 96% | 56,376 psi | 88% | 3045 fps | 97.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 46,079 psi | 72% | 2930 fps | 98.1% |
| IMR 4895 | <<locked>> | 90% | 55,463 psi | 87% | 3081 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 54,998 psi | 86% | 3009 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 54,911 psi | 86% | 2989 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,521 psi | 87% | 3031 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,506 psi | 87% | 2982 fps | 99.8% |
| Lovex S062 | <<locked>> | 92% | 56,014 psi | 88% | 3035 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,390 psi | 87% | 3031 fps | 98.4% |
| Lovex S070ᴾ | <<locked>> | 100% | 56,246 psi | 88% | 3064 fps | 97.7% |
| Norma 201 | <<locked>> | 88% | 54,563 psi | 86% | 3002 fps | 100% |
| Norma 202 | <<locked>> | 88% | 55,172 psi | 86% | 3005 fps | 100% |
| Norma 203B | <<locked>> | 92% | 56,695 psi | 89% | 3091 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 54,172 psi | 85% | 3087 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 92% | 57,667 psi | 90% | 3117 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 53,127 psi | 83% | 3084 fps | 97.8% |
| Ramshot TAC | <<locked>> | 86% | 55,477 psi | 87% | 3025 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,897 psi | 86% | 3045 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,912 psi | 88% | 3009 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,476 psi | 56% | 1909 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 54,404 psi | 85% | 2989 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,550 psi | 87% | 3035 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 54,534 psi | 85% | 3120 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 54,027 psi | 85% | 3153 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,824 psi | 86% | 3123 fps | 99.2% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,955 psi | 86% | 3156 fps | 99% |
| Rottweil R 901 | <<locked>> | 86% | 55,129 psi | 86% | 2982 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,897 psi | 86% | 2999 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 57,363 psi | 90% | 3084 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 54,230 psi | 85% | 3002 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,390 psi | 87% | 3031 fps | 98.4% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,521 psi | 87% | 3031 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 56,014 psi | 88% | 3035 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 56,318 psi | 88% | 3064 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,782 psi | 87% | 3097 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 57,566 psi | 90% | 2992 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 57,493 psi | 90% | 3058 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 54,578 psi | 86% | 3028 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 56,130 psi | 88% | 2943 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 56,434 psi | 88% | 2936 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 56,072 psi | 88% | 2982 fps | 97.3% |
| Somchem S321 | <<locked>> | 84% | 56,231 psi | 88% | 3045 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,579 psi | 87% | 2940 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 57,159 psi | 90% | 3051 fps | 99.9% |
| Somchem S355 | <<locked>> | 96% | 57,667 psi | 90% | 3081 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,559 psi | 76% | 3035 fps | 100% |
| Unknown powder | <<locked>> | 98% | 55,405 psi | 87% | 3100 fps | 98.9% |
| Vihtavuori N130 | <<locked>> | 84% | 54,752 psi | 86% | 2890 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,811 psi | 87% | 2923 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 54,723 psi | 86% | 2966 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,897 psi | 86% | 2972 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 55,492 psi | 87% | 3009 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,260 psi | 88% | 3074 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 84% | 54,694 psi | 86% | 3015 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 54,563 psi | 86% | 2999 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,159 psi | 88% | 3117 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,756 psi | 64% | 2890 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 53,925 psi | 85% | 3015 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 56,014 psi | 88% | 3068 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 56,463 psi | 88% | 3130 fps | 97.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,446 psi | 52% | 2782 fps | 96.7% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,796 psi | 87% | 3058 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% | 46,905 psi | 74% | 2808 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 51,474 psi | 81% | 2927 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,986 psi | 61% | 2713 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,947 psi | 70% | 2861 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 52,460 psi | 82% | 2920 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 36,927 psi | 58% | 2700 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 35,737 psi | 56% | 2730 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 43,236 psi | 68% | 2831 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 80% | 36,680 psi | 57% | 2667 fps | 96.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,382 psi | 71% | 2844 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 45,542 psi | 71% | 2838 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 53,272 psi | 83% | 3068 fps | 99.9% |
| Alliant Power Pro 2000-MR | 56.9 gr | 80% | 39,334 psi | 62% | 2851 fps | 96.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,114 psi | 57% | 2687 fps | 97.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,837 psi | 83% | 2913 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,957 psi | 61% | 2756 fps | 97% |
| Alliant Reloder-16 | <<locked>> | 88% | 36,230 psi | 57% | 2749 fps | 95.3% |
| Alliant Reloder-17 | 57.4 gr | 82% | 33,402 psi | 52% | 2700 fps | 96.1% |
| Alliant Reloder-23 | <<locked>> | 96% | 33,069 psi | 52% | 2690 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 39,030 psi | 61% | 2900 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,612 psi | 67% | 2831 fps | 97.4% |
| Bofors RP3 | <<locked>> | 80% | 35,621 psi | 56% | 2687 fps | 97.6% |
| Bofors RP7 | <<locked>> | 94% | 50,923 psi | 80% | 2946 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,181 psi | 74% | 2838 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,121 psi | 69% | 2861 fps | 99.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,820 psi | 77% | 3015 fps | 99% |
| Hodgdon H322 | <<locked>> | 80% | 48,124 psi | 75% | 2890 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 39,175 psi | 61% | 2749 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 90% | 45,600 psi | 71% | 2936 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 98% | 53,388 psi | 84% | 3028 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 43,627 psi | 68% | 2844 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 30,966 psi | 49% | 2575 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,333 psi | 59% | 2756 fps | 98% |
| Hodgdon Superformance | <<locked>> | 94% | 48,138 psi | 75% | 3002 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,078 psi | 41% | 1670 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,899 psi | 61% | 2726 fps | 97.9% |
| IMR 3031 | <<locked>> | 80% | 39,465 psi | 62% | 2772 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,853 psi | 56% | 2641 fps | 96.1% |
| IMR 4166 Enduron | <<locked>> | 88% | 46,108 psi | 72% | 2831 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 53,142 psi | 83% | 2874 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 47,921 psi | 75% | 2913 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 90% | 46,876 psi | 73% | 2874 fps | 95.2% |
| IMR 4831 | <<locked>> | 92% | 35,534 psi | 56% | 2703 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 39,900 psi | 63% | 2789 fps | 97.8% |
| IMR 8208 XBR | <<locked>> | 80% | 45,382 psi | 71% | 2844 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 80% | 51,285 psi | 80% | 2933 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,090 psi | 66% | 2808 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 43,352 psi | 68% | 2769 fps | 98.5% |
| Lovex S062 | <<locked>> | 80% | 38,218 psi | 60% | 2707 fps | 98.5% |
| Lovex S065 | <<locked>> | 88% | 40,524 psi | 64% | 2753 fps | 95.1% |
| Lovex S070 | <<locked>> | 94% | 46,572 psi | 73% | 2894 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 42,105 psi | 66% | 2779 fps | 99.2% |
| Norma 202 | <<locked>> | 80% | 42,511 psi | 67% | 2792 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,305 psi | 60% | 2743 fps | 97.3% |
| Norma URP | <<locked>> | 88% | 36,260 psi | 57% | 2736 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 37,927 psi | 59% | 2753 fps | 97% |
| Ramshot Hunter | <<locked>> | 94% | 43,497 psi | 68% | 2900 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 45,397 psi | 71% | 2844 fps | 96.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,889 psi | 70% | 2867 fps | 98.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,066 psi | 77% | 2897 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,252 psi | 41% | 1709 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,850 psi | 80% | 2933 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 45,426 psi | 71% | 2854 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,814 psi | 64% | 2861 fps | 97.4% |
| ReloadSwiss RS 60 | 56 gr | 80% | 33,243 psi | 52% | 2713 fps | 98.4% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 38,305 psi | 60% | 2812 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 41,466 psi | 65% | 2887 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 45,876 psi | 72% | 2828 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,132 psi | 63% | 2730 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 80% | 33,388 psi | 52% | 2625 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 94% | 50,923 psi | 80% | 2946 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 40,524 psi | 64% | 2753 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,090 psi | 66% | 2808 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 38,218 psi | 60% | 2707 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 94% | 46,630 psi | 73% | 2897 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,548 psi | 54% | 2677 fps | 96% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 53,940 psi | 85% | 2940 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,482 psi | 68% | 2812 fps | 96.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,713 psi | 65% | 2795 fps | 98.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,729 psi | 69% | 2740 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,245 psi | 57% | 2595 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 45,658 psi | 72% | 2805 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 49,197 psi | 77% | 2930 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 43,178 psi | 68% | 2740 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,352 psi | 68% | 2815 fps | 98.4% |
| Somchem S355 | <<locked>> | 80% | 34,345 psi | 54% | 2635 fps | 96.6% |
| Somchem S365 | <<locked>> | 84% | 28,311 psi | 44% | 2559 fps | 95.4% |
| Unknown powder | <<locked>> | 88% | 39,610 psi | 62% | 2802 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 48,472 psi | 76% | 2799 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,249 psi | 65% | 2690 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,639 psi | 62% | 2720 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,856 psi | 62% | 2717 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 29,269 psi | 46% | 2484 fps | 96.2% |
| Vihtavuori N160 | <<locked>> | 86% | 37,159 psi | 58% | 2720 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 47,848 psi | 75% | 2900 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 39,479 psi | 62% | 2733 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 37,666 psi | 59% | 2762 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 96% | 35,563 psi | 56% | 2769 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 31,198 psi | 49% | 2543 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 48,820 psi | 77% | 2953 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 45,600 psi | 71% | 2936 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 98% | 31,256 psi | 49% | 2707 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,677 psi | 81% | 2992 fps | 99.8% |
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 | 150gr | Hornady ECX. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,182 fps; across all powders the maximum-charge window runs from 1,870 fps to 3,182 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 52–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:13.0 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. Alliant Reloder-17, ReloadSwiss RS 60, Alliant Power Pro 2000-MR rank at the top here: for .300 WSM with the .308 | 150gr | Hornady ECX 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.