Load Specifications
Bullet:.308 | 150gr | Lapua Mega
Bullet Manufacturer:Lapua
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:1:11.5
Load data in caliber .300 WSM with .308 | 150gr | Lapua Mega bullet and 102 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, ReloadSwiss RS 60 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>> | 86% | 56,405 psi | 88% | 2936 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,853 psi | 86% | 2963 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,955 psi | 86% | 2959 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 57,058 psi | 89% | 3031 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 54,520 psi | 85% | 2946 fps | 95.9% |
| Accurate 4064 | <<locked>> | 92% | 54,955 psi | 86% | 3005 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 54,375 psi | 85% | 3077 fps | 99.1% |
| ADI AR 2206H | <<locked>> | 88% | 55,724 psi | 87% | 3041 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 94% | 56,681 psi | 89% | 3035 fps | 99.6% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,737 psi | 86% | 2989 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 55,085 psi | 86% | 2966 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 56,536 psi | 89% | 3104 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,303 psi | 87% | 3159 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 56,521 psi | 89% | 3058 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 56,115 psi | 88% | 2943 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 57,246 psi | 90% | 3084 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,359 psi | 82% | 3077 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 98% | 57,595 psi | 90% | 3186 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,333 psi | 59% | 2789 fps | 97.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,626 psi | 65% | 2946 fps | 96.2% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,448 psi | 87% | 3051 fps | 99.3% |
| Bofors RP3 | <<locked>> | 94% | 57,174 psi | 90% | 3074 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 57,435 psi | 90% | 3035 fps | 96.8% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,405 psi | 88% | 2972 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 57,740 psi | 90% | 3074 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,912 psi | 88% | 3120 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 82% | 55,187 psi | 86% | 2982 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 56,318 psi | 88% | 3012 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,781 psi | 86% | 3031 fps | 98.8% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 57,551 psi | 90% | 3130 fps | 97.6% |
| Hodgdon H4895 | <<locked>> | 88% | 56,246 psi | 88% | 3051 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,544 psi | 76% | 2953 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,521 psi | 87% | 3081 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 55,071 psi | 86% | 3110 fps | 96.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,143 psi | 55% | 1854 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 57,522 psi | 90% | 3051 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 55,796 psi | 87% | 3031 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 56,086 psi | 88% | 3018 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 90% | 56,188 psi | 88% | 2992 fps | 97.1% |
| IMR 4198 | <<locked>> | 82% | 56,014 psi | 88% | 2900 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,954 psi | 85% | 3002 fps | 96.2% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,796 psi | 87% | 3015 fps | 97% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,517 psi | 81% | 3012 fps | 98.8% |
| IMR 4895 | <<locked>> | 90% | 55,114 psi | 86% | 3061 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 86% | 54,737 psi | 86% | 2989 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 54,708 psi | 86% | 2969 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,245 psi | 87% | 3012 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,216 psi | 87% | 2963 fps | 99.8% |
| Lovex S062 | <<locked>> | 92% | 55,695 psi | 87% | 3012 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,056 psi | 86% | 3009 fps | 98.2% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,767 psi | 87% | 3041 fps | 97.4% |
| Norma 201 | <<locked>> | 88% | 54,259 psi | 85% | 2979 fps | 100% |
| Norma 202 | <<locked>> | 88% | 54,737 psi | 86% | 2986 fps | 100% |
| Norma 203B | <<locked>> | 92% | 56,391 psi | 88% | 3068 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 53,461 psi | 84% | 3064 fps | 99% |
| Ramshot Big Game | <<locked>> | 92% | 56,913 psi | 89% | 3091 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,663 psi | 83% | 3058 fps | 97.5% |
| Ramshot TAC | <<locked>> | 86% | 54,969 psi | 86% | 2999 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,534 psi | 85% | 3022 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,535 psi | 87% | 2986 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,737 psi | 56% | 1900 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 57,566 psi | 90% | 3022 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,158 psi | 86% | 3012 fps | 97.6% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 53,766 psi | 84% | 3091 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 57,217 psi | 90% | 3186 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,012 psi | 85% | 3097 fps | 98.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,317 psi | 85% | 3127 fps | 98.7% |
| Rottweil R 901 | <<locked>> | 86% | 55,361 psi | 87% | 2966 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,897 psi | 86% | 2979 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 57,029 psi | 89% | 3064 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 57,435 psi | 90% | 3035 fps | 96.8% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,056 psi | 86% | 3009 fps | 98.2% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,245 psi | 87% | 3012 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,695 psi | 87% | 3012 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,767 psi | 87% | 3041 fps | 97.4% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 57,290 psi | 90% | 2992 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,042 psi | 86% | 3071 fps | 99.7% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,971 psi | 89% | 2966 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 57,058 psi | 89% | 3035 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 57,725 psi | 90% | 3061 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 56,130 psi | 88% | 2923 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,956 psi | 88% | 2917 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,637 psi | 87% | 2956 fps | 97% |
| Somchem S321 | <<locked>> | 84% | 55,941 psi | 88% | 3022 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,216 psi | 87% | 2917 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 56,594 psi | 89% | 3025 fps | 99.8% |
| Somchem S355 | <<locked>> | 96% | 57,217 psi | 90% | 3061 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,008 psi | 75% | 3012 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 55,680 psi | 87% | 2887 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 56,246 psi | 88% | 2910 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 54,360 psi | 85% | 2946 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,288 psi | 87% | 2959 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,347 psi | 87% | 2989 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 56,188 psi | 88% | 3061 fps | 99.2% |
| Vihtavuori N530 | <<locked>> | 86% | 55,245 psi | 87% | 2989 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 57,261 psi | 90% | 3012 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 55,405 psi | 87% | 3071 fps | 99% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,596 psi | 64% | 2874 fps | 97.3% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 57,188 psi | 90% | 3045 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 55,056 psi | 86% | 3038 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 54,186 psi | 85% | 3077 fps | 97% |
| Winchester StaBALL Match | <<locked>> | 90% | 57,450 psi | 90% | 3068 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% | 46,847 psi | 73% | 2792 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 51,430 psi | 81% | 2910 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,465 psi | 62% | 2707 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,456 psi | 73% | 2861 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 50,937 psi | 80% | 2884 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 37,318 psi | 58% | 2694 fps | 99.8% |
| Accurate 4350 | <<locked>> | 90% | 38,508 psi | 60% | 2779 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 43,250 psi | 68% | 2815 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 80% | 36,796 psi | 58% | 2654 fps | 95.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,266 psi | 71% | 2828 fps | 99.4% |
| Alliant AR-Comp | <<locked>> | 80% | 45,266 psi | 71% | 2822 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,881 psi | 83% | 3045 fps | 99.8% |
| Alliant Power Pro 2000-MR | 55.3 gr | 80% | 39,247 psi | 62% | 2831 fps | 96.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,172 psi | 57% | 2674 fps | 97.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,547 psi | 82% | 2890 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,972 psi | 61% | 2740 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 88% | 36,245 psi | 57% | 2730 fps | 95% |
| Alliant Reloder-17 | 55.8 gr | 82% | 33,460 psi | 52% | 2687 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 96% | 33,098 psi | 52% | 2674 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 38,812 psi | 61% | 2877 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,293 psi | 66% | 2808 fps | 97.1% |
| Bofors RP3 | <<locked>> | 80% | 35,694 psi | 56% | 2674 fps | 97.4% |
| Bofors RP7 | <<locked>> | 94% | 50,517 psi | 79% | 2920 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,065 psi | 74% | 2818 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,048 psi | 69% | 2848 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,530 psi | 76% | 2995 fps | 98.8% |
| Hodgdon H322 | <<locked>> | 80% | 51,648 psi | 81% | 2930 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,620 psi | 82% | 2953 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 39,175 psi | 61% | 2733 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 94% | 47,108 psi | 74% | 2949 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 43,598 psi | 68% | 2828 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 33,141 psi | 52% | 2621 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,508 psi | 62% | 2789 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 96% | 51,082 psi | 80% | 3038 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,252 psi | 41% | 1660 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,785 psi | 65% | 2772 fps | 98.4% |
| IMR 3031 | <<locked>> | 80% | 42,946 psi | 67% | 2825 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,624 psi | 61% | 2690 fps | 96.7% |
| IMR 4166 Enduron | <<locked>> | 84% | 46,615 psi | 73% | 2822 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 52,736 psi | 83% | 2854 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 50,705 psi | 79% | 2946 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 92% | 49,255 psi | 77% | 2900 fps | 95.6% |
| IMR 4831 | <<locked>> | 90% | 37,144 psi | 58% | 2730 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 39,914 psi | 63% | 2772 fps | 97.6% |
| IMR 8208 XBR | <<locked>> | 80% | 45,266 psi | 71% | 2828 fps | 99.4% |
| Lovex D073.5 | <<locked>> | 80% | 51,314 psi | 80% | 2920 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,264 psi | 66% | 2795 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 43,453 psi | 68% | 2753 fps | 98.4% |
| Lovex S062 | <<locked>> | 80% | 38,464 psi | 60% | 2697 fps | 98.4% |
| Lovex S065 | <<locked>> | 90% | 43,018 psi | 67% | 2789 fps | 95.6% |
| Lovex S070 | <<locked>> | 94% | 46,311 psi | 73% | 2874 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 42,221 psi | 66% | 2762 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 42,496 psi | 67% | 2776 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,363 psi | 60% | 2730 fps | 97.2% |
| Norma URP | <<locked>> | 90% | 38,580 psi | 60% | 2776 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 37,855 psi | 59% | 2740 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 94% | 43,091 psi | 68% | 2874 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 45,121 psi | 71% | 2822 fps | 96.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,541 psi | 70% | 2844 fps | 98.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,936 psi | 77% | 2877 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,484 psi | 42% | 1696 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,734 psi | 80% | 2913 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 45,266 psi | 71% | 2835 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,727 psi | 64% | 2844 fps | 97.2% |
| ReloadSwiss RS 60 | 54.4 gr | 80% | 33,243 psi | 52% | 2697 fps | 98.3% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 38,116 psi | 60% | 2789 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 41,176 psi | 65% | 2861 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 46,253 psi | 72% | 2818 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,248 psi | 63% | 2713 fps | 98.7% |
| Rottweil R 903 | <<locked>> | 80% | 33,605 psi | 53% | 2615 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 94% | 50,517 psi | 79% | 2920 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 90% | 43,018 psi | 67% | 2789 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,264 psi | 66% | 2795 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 38,464 psi | 60% | 2697 fps | 98.4% |
| Shooters World SW4350 | <<locked>> | 94% | 46,311 psi | 73% | 2874 fps | 95.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 53,708 psi | 84% | 2936 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,693 psi | 54% | 2664 fps | 95.8% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 53,606 psi | 84% | 2920 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,482 psi | 68% | 2795 fps | 96.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,771 psi | 65% | 2779 fps | 98% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,801 psi | 69% | 2726 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,347 psi | 57% | 2582 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 48,733 psi | 76% | 2844 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 48,878 psi | 77% | 2907 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 43,207 psi | 68% | 2723 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,047 psi | 67% | 2792 fps | 98.2% |
| Somchem S355 | <<locked>> | 80% | 34,490 psi | 54% | 2625 fps | 96.5% |
| Somchem S365 | <<locked>> | 84% | 28,500 psi | 45% | 2546 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 49,472 psi | 78% | 2795 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,077 psi | 69% | 2723 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,653 psi | 62% | 2707 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,234 psi | 63% | 2707 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 32,837 psi | 51% | 2559 fps | 97.4% |
| Vihtavuori N160 | <<locked>> | 88% | 37,985 psi | 60% | 2726 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 45,194 psi | 71% | 2822 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 38,812 psi | 61% | 2697 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 88% | 37,304 psi | 58% | 2723 fps | 95% |
| Vihtavuori N555 | <<locked>> | 96% | 35,462 psi | 56% | 2756 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 31,241 psi | 49% | 2526 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 44,802 psi | 70% | 2867 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 47,282 psi | 74% | 2953 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,104 psi | 64% | 2782 fps | 98.4% |
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 102 powders for .300 WSM loaded with the .308 | 150gr | Lapua Mega. Alliant Reloder-17 delivers the highest muzzle velocity at 3,186 fps; across all powders the maximum-charge window runs from 1,854 fps to 3,186 fps. Accurate 4350 gives the best case fill at 100 %, and 102 of the 102 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 150.0 gr projectile in 0.308" calls for a 1:11.5 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 Power Pro 2000-MR, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for .300 WSM with the .308 | 150gr | Lapua Mega 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.