Load Specifications
Bullet Manufacturer:Swift
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:1:12.0
Load data in caliber .300 WSM with .308 | 150gr | Swift Scirocco 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% | 57,145 psi | 90% | 2949 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,782 psi | 87% | 2979 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 56,028 psi | 88% | 2976 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,202 psi | 88% | 3031 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 56,521 psi | 89% | 2969 fps | 96.5% |
| Accurate 4064 | <<locked>> | 92% | 55,651 psi | 87% | 3018 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 55,550 psi | 87% | 3100 fps | 99.3% |
| ADI AR 2206H | <<locked>> | 88% | 56,304 psi | 88% | 3054 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 94% | 57,493 psi | 90% | 3054 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 55,361 psi | 87% | 3005 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 56,217 psi | 88% | 2986 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 57,348 psi | 90% | 3120 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 56,130 psi | 88% | 3176 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 57,392 psi | 90% | 3077 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 56,637 psi | 89% | 2956 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 54,375 psi | 85% | 3041 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 53,345 psi | 84% | 3104 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 96% | 54,621 psi | 86% | 3146 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,087 psi | 60% | 2812 fps | 97.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,583 psi | 67% | 2972 fps | 96.7% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 56,202 psi | 88% | 3068 fps | 99.4% |
| Bofors RP3 | <<locked>> | 92% | 54,360 psi | 85% | 3038 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 54,636 psi | 86% | 2999 fps | 96.4% |
| Hodgdon Benchmark | <<locked>> | 86% | 57,029 psi | 89% | 2986 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 54,766 psi | 86% | 3035 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 56,855 psi | 89% | 3140 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 84% | 55,376 psi | 87% | 2992 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 55,564 psi | 87% | 3051 fps | 99% |
| Hodgdon H414 | <<locked>> | 96% | 56,565 psi | 89% | 3120 fps | 97.5% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 57,101 psi | 89% | 3077 fps | 96.2% |
| Hodgdon H4895 | <<locked>> | 88% | 56,855 psi | 89% | 3068 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,588 psi | 78% | 2972 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 56,405 psi | 88% | 3100 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 55,912 psi | 88% | 3130 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,360 psi | 55% | 1864 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 57,043 psi | 89% | 3051 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 55,201 psi | 87% | 3028 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 55,796 psi | 87% | 3018 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 94% | 55,637 psi | 87% | 2992 fps | 97.2% |
| IMR 4198 | <<locked>> | 82% | 56,594 psi | 89% | 2913 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 54,897 psi | 86% | 3025 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 96% | 56,536 psi | 89% | 3035 fps | 97.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 46,572 psi | 73% | 2930 fps | 98.1% |
| IMR 4895 | <<locked>> | 90% | 55,753 psi | 87% | 3077 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 55,361 psi | 87% | 3005 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 55,651 psi | 87% | 2989 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 56,202 psi | 88% | 3031 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 56,086 psi | 88% | 2982 fps | 99.8% |
| Lovex S062 | <<locked>> | 92% | 56,565 psi | 89% | 3031 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,825 psi | 87% | 3025 fps | 98.4% |
| Lovex S070ᴾ | <<locked>> | 100% | 56,753 psi | 89% | 3061 fps | 97.6% |
| Norma 201 | <<locked>> | 88% | 55,187 psi | 86% | 3002 fps | 100% |
| Norma 202 | <<locked>> | 88% | 55,695 psi | 87% | 3002 fps | 100% |
| Norma 203B | <<locked>> | 92% | 57,261 psi | 90% | 3087 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 54,549 psi | 85% | 3087 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 90% | 54,157 psi | 85% | 3054 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 53,548 psi | 84% | 3081 fps | 97.8% |
| Ramshot TAC | <<locked>> | 86% | 55,724 psi | 87% | 3018 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 86% | 55,347 psi | 87% | 3041 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 84% | 56,347 psi | 88% | 3005 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,737 psi | 56% | 1906 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 54,752 psi | 86% | 2986 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,883 psi | 88% | 3028 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 54,752 psi | 86% | 3110 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 54,360 psi | 85% | 3150 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 55,376 psi | 87% | 3123 fps | 99.2% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 55,172 psi | 86% | 3150 fps | 98.9% |
| Rottweil R 901 | <<locked>> | 86% | 56,101 psi | 88% | 2986 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 55,506 psi | 87% | 2995 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 54,230 psi | 85% | 3028 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 96% | 54,636 psi | 86% | 2999 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,825 psi | 87% | 3025 fps | 98.4% |
| Shooters World Match Rifle | <<locked>> | 88% | 56,202 psi | 88% | 3031 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 56,565 psi | 89% | 3031 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 56,753 psi | 89% | 3061 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 56,086 psi | 88% | 3091 fps | 99.8% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 57,580 psi | 90% | 2982 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 54,085 psi | 85% | 2995 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 54,781 psi | 86% | 3022 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 56,782 psi | 89% | 2940 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 56,811 psi | 89% | 2933 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 56,231 psi | 88% | 2976 fps | 97.2% |
| Somchem S321 | <<locked>> | 84% | 56,811 psi | 89% | 3041 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 56,115 psi | 88% | 2936 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 57,435 psi | 90% | 3045 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 54,534 psi | 85% | 3025 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 49,008 psi | 77% | 3035 fps | 100% |
| Unknown powder | <<locked>> | 98% | 55,767 psi | 87% | 3097 fps | 98.9% |
| Vihtavuori N130 | <<locked>> | 84% | 55,274 psi | 87% | 2887 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 56,086 psi | 88% | 2917 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 55,129 psi | 86% | 2963 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,347 psi | 87% | 2969 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 55,883 psi | 88% | 3005 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,318 psi | 88% | 3064 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 84% | 55,085 psi | 86% | 3012 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,143 psi | 86% | 2999 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,608 psi | 89% | 3117 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,365 psi | 65% | 2894 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 54,186 psi | 85% | 3009 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 56,478 psi | 89% | 3064 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 56,565 psi | 89% | 3120 fps | 97.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,142 psi | 54% | 2792 fps | 96.9% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,086 psi | 88% | 3054 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% | 47,616 psi | 75% | 2808 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,098 psi | 82% | 2927 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,248 psi | 63% | 2723 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,585 psi | 71% | 2861 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 52,910 psi | 83% | 2913 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 38,000 psi | 60% | 2713 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 36,492 psi | 57% | 2736 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 43,859 psi | 69% | 2831 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 80% | 37,217 psi | 58% | 2671 fps | 96.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,934 psi | 72% | 2844 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 45,861 psi | 72% | 2835 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 53,737 psi | 84% | 3064 fps | 99.9% |
| Alliant Power Pro 2000-MR | 56.1 gr | 80% | 39,769 psi | 62% | 2851 fps | 96.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,767 psi | 58% | 2694 fps | 97.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 53,432 psi | 84% | 2910 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,610 psi | 62% | 2759 fps | 97.1% |
| Alliant Reloder-16 | <<locked>> | 88% | 36,709 psi | 58% | 2749 fps | 95.3% |
| Alliant Reloder-17 | 55.2 gr | 80% | 31,705 psi | 50% | 2641 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 96% | 33,634 psi | 53% | 2694 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 39,494 psi | 62% | 2900 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,047 psi | 67% | 2831 fps | 97.4% |
| Bofors RP3 | <<locked>> | 80% | 36,332 psi | 57% | 2694 fps | 97.7% |
| Bofors RP7 | <<locked>> | 94% | 51,314 psi | 80% | 2943 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,732 psi | 75% | 2835 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,672 psi | 70% | 2864 fps | 99.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 49,226 psi | 77% | 3012 fps | 99% |
| Hodgdon H322 | <<locked>> | 80% | 48,646 psi | 76% | 2887 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 39,755 psi | 62% | 2753 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 90% | 46,195 psi | 72% | 2936 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 98% | 53,650 psi | 84% | 3022 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 44,280 psi | 69% | 2844 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 31,676 psi | 50% | 2585 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,782 psi | 59% | 2756 fps | 98.1% |
| Hodgdon Superformance | <<locked>> | 94% | 48,414 psi | 76% | 2995 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,194 psi | 41% | 1663 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,233 psi | 61% | 2723 fps | 97.9% |
| IMR 3031 | <<locked>> | 80% | 40,001 psi | 63% | 2772 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,405 psi | 57% | 2644 fps | 96.1% |
| IMR 4166 Enduron | <<locked>> | 88% | 46,499 psi | 73% | 2828 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 53,345 psi | 84% | 2867 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 48,254 psi | 76% | 2910 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 90% | 47,036 psi | 74% | 2864 fps | 95.1% |
| IMR 4831 | <<locked>> | 92% | 36,172 psi | 57% | 2710 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 40,582 psi | 64% | 2795 fps | 97.9% |
| IMR 8208 XBR | <<locked>> | 80% | 45,934 psi | 72% | 2844 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 80% | 52,011 psi | 82% | 2936 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,931 psi | 67% | 2812 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 43,830 psi | 69% | 2766 fps | 98.5% |
| Lovex S062 | <<locked>> | 80% | 38,943 psi | 61% | 2713 fps | 98.6% |
| Lovex S065 | <<locked>> | 88% | 41,162 psi | 65% | 2753 fps | 95.2% |
| Lovex S070 | <<locked>> | 94% | 47,021 psi | 74% | 2894 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 42,902 psi | 67% | 2782 fps | 99.2% |
| Norma 202 | <<locked>> | 80% | 43,192 psi | 68% | 2795 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,001 psi | 61% | 2749 fps | 97.5% |
| Norma URP | <<locked>> | 88% | 36,840 psi | 58% | 2740 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 38,435 psi | 60% | 2756 fps | 97.1% |
| Ramshot Hunter | <<locked>> | 94% | 43,918 psi | 69% | 2897 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 45,832 psi | 72% | 2841 fps | 96.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,324 psi | 71% | 2867 fps | 98.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,501 psi | 78% | 2890 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,614 psi | 42% | 1706 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,416 psi | 81% | 2933 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 45,992 psi | 72% | 2854 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,495 psi | 65% | 2867 fps | 97.5% |
| ReloadSwiss RS 60 | 55.2 gr | 80% | 33,765 psi | 53% | 2717 fps | 98.5% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 39,001 psi | 61% | 2818 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 41,959 psi | 66% | 2890 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 46,775 psi | 73% | 2831 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,886 psi | 64% | 2733 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 80% | 34,243 psi | 54% | 2635 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 94% | 51,314 psi | 80% | 2943 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,162 psi | 65% | 2753 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,931 psi | 67% | 2812 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 38,943 psi | 61% | 2713 fps | 98.6% |
| Shooters World SW4350 | <<locked>> | 94% | 47,021 psi | 74% | 2894 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,230 psi | 55% | 2684 fps | 96.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 54,215 psi | 85% | 2933 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,092 psi | 69% | 2815 fps | 96.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,351 psi | 66% | 2799 fps | 98.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,280 psi | 69% | 2740 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,767 psi | 58% | 2598 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 46,325 psi | 73% | 2808 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 49,705 psi | 78% | 2927 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 43,859 psi | 69% | 2743 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,874 psi | 69% | 2815 fps | 98.4% |
| Somchem S355 | <<locked>> | 80% | 35,114 psi | 55% | 2641 fps | 96.8% |
| Somchem S365 | <<locked>> | 84% | 28,935 psi | 45% | 2566 fps | 95.6% |
| Unknown powder | <<locked>> | 88% | 40,118 psi | 63% | 2802 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 48,979 psi | 77% | 2795 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,727 psi | 65% | 2687 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,190 psi | 63% | 2720 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,263 psi | 63% | 2717 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 29,979 psi | 47% | 2490 fps | 96.4% |
| Vihtavuori N160 | <<locked>> | 86% | 37,768 psi | 59% | 2720 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 48,167 psi | 75% | 2897 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 39,929 psi | 63% | 2733 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 38,072 psi | 60% | 2762 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 94% | 34,040 psi | 53% | 2720 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 31,763 psi | 50% | 2546 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 49,240 psi | 77% | 2949 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 46,195 psi | 72% | 2936 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 98% | 31,937 psi | 50% | 2720 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,156 psi | 82% | 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 | Swift Scirocco. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,176 fps; across all powders the maximum-charge window runs from 1,864 fps to 3,176 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 54–90 %, leaving at least 10 % headroom. The 150.0 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 | 150gr | Swift Scirocco 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.