Load Specifications
Bullet:.308 | 150gr | Hornady GMX
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:1:11.5
Load data in caliber .300 WSM with .308 | 150gr | Hornady GMX 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 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% | 55,288 psi | 87% | 2930 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 57,493 psi | 90% | 3009 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 56,739 psi | 89% | 2992 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,825 psi | 87% | 3022 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 57,087 psi | 89% | 2995 fps | 96.5% |
| Accurate 4064 | <<locked>> | 94% | 56,739 psi | 89% | 3041 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,040 psi | 83% | 3064 fps | 99% |
| ADI AR 2206H | <<locked>> | 88% | 54,462 psi | 85% | 3028 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 94% | 55,825 psi | 87% | 3028 fps | 99.5% |
| ADI Benchmark 8208 | <<locked>> | 88% | 57,087 psi | 89% | 3035 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 54,085 psi | 85% | 2959 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,230 psi | 87% | 3091 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,375 psi | 85% | 3150 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,230 psi | 87% | 3045 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 54,868 psi | 86% | 2936 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 55,956 psi | 88% | 3068 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,706 psi | 81% | 3074 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 98% | 56,550 psi | 89% | 3176 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,347 psi | 57% | 2769 fps | 97% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 57,203 psi | 90% | 2913 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,491 psi | 85% | 3041 fps | 99.2% |
| Bofors RP3 | <<locked>> | 94% | 55,883 psi | 88% | 3064 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 56,405 psi | 88% | 3028 fps | 96.7% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,608 psi | 87% | 2966 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 56,623 psi | 89% | 3064 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,955 psi | 86% | 3110 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 82% | 54,331 psi | 85% | 2979 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,448 psi | 87% | 3005 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 57,334 psi | 90% | 3081 fps | 99.1% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 56,507 psi | 89% | 3120 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 98% | 57,406 psi | 90% | 3084 fps | 96.2% |
| Hodgdon H4895 | <<locked>> | 88% | 54,969 psi | 86% | 3038 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,543 psi | 75% | 2940 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 54,549 psi | 85% | 3074 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 54,056 psi | 85% | 3100 fps | 96.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,969 psi | 55% | 1854 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,710 psi | 89% | 3048 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 54,810 psi | 86% | 3025 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,172 psi | 86% | 3012 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,376 psi | 87% | 2986 fps | 97% |
| IMR 4198 | <<locked>> | 82% | 55,085 psi | 86% | 2894 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,040 psi | 83% | 2992 fps | 96% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,940 psi | 86% | 3009 fps | 96.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,343 psi | 79% | 3002 fps | 98.7% |
| IMR 4895 | <<locked>> | 92% | 57,377 psi | 90% | 3104 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 88% | 57,087 psi | 89% | 3035 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 57,363 psi | 90% | 3018 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,041 psi | 85% | 3002 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,462 psi | 85% | 2959 fps | 99.7% |
| Lovex S062 | <<locked>> | 92% | 54,621 psi | 86% | 3005 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 57,276 psi | 90% | 3051 fps | 98.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,636 psi | 86% | 3028 fps | 97.2% |
| Norma 201 | <<locked>> | 90% | 56,652 psi | 89% | 3025 fps | 100% |
| Norma 202 | <<locked>> | 90% | 57,334 psi | 90% | 3028 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,114 psi | 86% | 3054 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 52,402 psi | 82% | 3054 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 92% | 55,927 psi | 88% | 3084 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,634 psi | 81% | 3048 fps | 97.4% |
| Ramshot TAC | <<locked>> | 86% | 54,085 psi | 85% | 2992 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 88% | 57,377 psi | 90% | 3074 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,665 psi | 86% | 2979 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,288 psi | 55% | 1896 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 56,710 psi | 89% | 3015 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 57,740 psi | 90% | 3058 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 56,739 psi | 89% | 3146 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 56,217 psi | 88% | 3179 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 53,127 psi | 83% | 3091 fps | 98.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,345 psi | 84% | 3120 fps | 98.6% |
| Rottweil R 901 | <<locked>> | 88% | 57,319 psi | 90% | 3005 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 57,043 psi | 89% | 3022 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,738 psi | 87% | 3054 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 56,405 psi | 88% | 3028 fps | 96.7% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 57,276 psi | 90% | 3051 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,041 psi | 85% | 3002 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,621 psi | 86% | 3005 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,636 psi | 86% | 3028 fps | 97.2% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 56,391 psi | 88% | 2986 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,041 psi | 85% | 3061 fps | 99.7% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 55,927 psi | 88% | 2959 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 55,985 psi | 88% | 3025 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 56,768 psi | 89% | 3054 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 54,940 psi | 86% | 2917 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,114 psi | 86% | 2910 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,520 psi | 85% | 2949 fps | 96.9% |
| Somchem S321 | <<locked>> | 84% | 54,911 psi | 86% | 3015 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 57,696 psi | 90% | 2963 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,666 psi | 87% | 3022 fps | 99.8% |
| Somchem S355 | <<locked>> | 96% | 56,086 psi | 88% | 3051 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,891 psi | 73% | 2999 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 54,824 psi | 86% | 2884 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,158 psi | 86% | 2900 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 56,724 psi | 89% | 2986 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,317 psi | 85% | 2956 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,273 psi | 85% | 2979 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,143 psi | 86% | 3054 fps | 99.1% |
| Vihtavuori N530 | <<locked>> | 86% | 54,317 psi | 85% | 2982 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 55,927 psi | 88% | 2999 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,302 psi | 85% | 3061 fps | 98.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,349 psi | 62% | 2854 fps | 97% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 56,159 psi | 88% | 3038 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 57,725 psi | 90% | 3084 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 56,797 psi | 89% | 3127 fps | 97.5% |
| Winchester StaBALL Match | <<locked>> | 90% | 56,449 psi | 88% | 3061 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% | 45,774 psi | 72% | 2785 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 49,980 psi | 78% | 2897 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,898 psi | 59% | 2684 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,266 psi | 71% | 2851 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 53,548 psi | 84% | 2936 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 35,839 psi | 56% | 2671 fps | 99.6% |
| Accurate 4350 | <<locked>> | 90% | 37,057 psi | 58% | 2756 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 42,061 psi | 66% | 2799 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 80% | 35,824 psi | 56% | 2638 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,208 psi | 69% | 2815 fps | 99.3% |
| Alliant AR-Comp | <<locked>> | 80% | 44,034 psi | 69% | 2808 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 51,663 psi | 81% | 3031 fps | 99.8% |
| Alliant Power Pro 2000-MR | 55.4 gr | 80% | 38,159 psi | 60% | 2815 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,172 psi | 55% | 2657 fps | 97.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,590 psi | 81% | 2887 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,826 psi | 59% | 2723 fps | 96.5% |
| Alliant Reloder-16 | <<locked>> | 90% | 37,550 psi | 59% | 2776 fps | 95.6% |
| Alliant Reloder-17 | 55.9 gr | 82% | 32,387 psi | 51% | 2664 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 96% | 32,068 psi | 50% | 2654 fps | 95% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 53,606 psi | 84% | 2864 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,379 psi | 65% | 2799 fps | 96.9% |
| Bofors RP3 | <<locked>> | 80% | 34,519 psi | 54% | 2654 fps | 97.1% |
| Bofors RP7 | <<locked>> | 94% | 49,516 psi | 78% | 2910 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,035 psi | 72% | 2808 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,815 psi | 67% | 2831 fps | 99.5% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,369 psi | 74% | 2982 fps | 98.7% |
| Hodgdon H322 | <<locked>> | 80% | 50,821 psi | 80% | 2927 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,721 psi | 81% | 2949 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 38,116 psi | 60% | 2720 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 94% | 46,079 psi | 72% | 2940 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 96% | 53,838 psi | 84% | 3025 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 42,453 psi | 67% | 2812 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 32,198 psi | 50% | 2605 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,580 psi | 60% | 2776 fps | 98.2% |
| Hodgdon Superformance | <<locked>> | 96% | 50,082 psi | 78% | 3028 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,889 psi | 41% | 1657 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,973 psi | 64% | 2766 fps | 98.3% |
| IMR 3031 | <<locked>> | 80% | 41,959 psi | 66% | 2815 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,550 psi | 59% | 2677 fps | 96.5% |
| IMR 4166 Enduron | <<locked>> | 86% | 48,805 psi | 76% | 2871 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 52,083 psi | 82% | 2851 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 49,748 psi | 78% | 2936 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 92% | 48,428 psi | 76% | 2894 fps | 95.4% |
| IMR 4831 | <<locked>> | 90% | 36,027 psi | 56% | 2713 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 38,740 psi | 61% | 2756 fps | 97.4% |
| IMR 8208 XBR | <<locked>> | 80% | 44,208 psi | 69% | 2815 fps | 99.3% |
| Lovex D073.5 | <<locked>> | 80% | 49,864 psi | 78% | 2904 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 40,886 psi | 64% | 2779 fps | 99.7% |
| Lovex S060 | <<locked>> | 80% | 42,409 psi | 66% | 2740 fps | 98.2% |
| Lovex S062 | <<locked>> | 80% | 37,260 psi | 58% | 2677 fps | 98.1% |
| Lovex S065 | <<locked>> | 90% | 42,003 psi | 66% | 2776 fps | 95.4% |
| Lovex S070 | <<locked>> | 94% | 45,208 psi | 71% | 2861 fps | 95% |
| Norma 201 | <<locked>> | 80% | 41,104 psi | 64% | 2753 fps | 98.9% |
| Norma 202 | <<locked>> | 80% | 41,510 psi | 65% | 2766 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 37,173 psi | 58% | 2710 fps | 96.9% |
| Norma URP | <<locked>> | 90% | 37,608 psi | 59% | 2762 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 36,767 psi | 58% | 2720 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 96% | 45,121 psi | 71% | 2927 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 44,222 psi | 69% | 2812 fps | 96.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,598 psi | 68% | 2835 fps | 98.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,805 psi | 75% | 2864 fps | 99% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,252 psi | 41% | 1699 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,864 psi | 78% | 2907 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 44,295 psi | 69% | 2822 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,552 psi | 62% | 2828 fps | 96.9% |
| ReloadSwiss RS 60 | 54.6 gr | 80% | 32,358 psi | 51% | 2677 fps | 98% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 37,028 psi | 58% | 2776 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 40,219 psi | 63% | 2848 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 44,788 psi | 70% | 2802 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,146 psi | 61% | 2700 fps | 98.5% |
| Rottweil R 903 | <<locked>> | 80% | 32,445 psi | 51% | 2595 fps | 96% |
| Rottweil R 907 | <<locked>> | 94% | 49,516 psi | 78% | 2910 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 42,003 psi | 66% | 2776 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,886 psi | 64% | 2779 fps | 99.7% |
| Shooters World Precision | <<locked>> | 80% | 37,260 psi | 58% | 2677 fps | 98.1% |
| Shooters World SW4350 | <<locked>> | 94% | 45,208 psi | 71% | 2861 fps | 95% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,576 psi | 82% | 2927 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,591 psi | 53% | 2644 fps | 95.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,547 psi | 82% | 2910 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,221 psi | 66% | 2779 fps | 96.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,654 psi | 64% | 2762 fps | 97.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,714 psi | 67% | 2713 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,317 psi | 55% | 2569 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 47,703 psi | 75% | 2835 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 47,848 psi | 75% | 2897 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 42,235 psi | 66% | 2717 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,134 psi | 66% | 2785 fps | 98% |
| Somchem S355 | <<locked>> | 80% | 33,431 psi | 52% | 2605 fps | 96.1% |
| Somchem S365 | <<locked>> | 86% | 29,240 psi | 46% | 2579 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 48,385 psi | 76% | 2789 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,033 psi | 67% | 2713 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,421 psi | 60% | 2690 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,305 psi | 62% | 2697 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 31,821 psi | 50% | 2543 fps | 97.1% |
| Vihtavuori N160 | <<locked>> | 88% | 36,825 psi | 58% | 2707 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 44,309 psi | 69% | 2812 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 80% | 37,826 psi | 59% | 2684 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 90% | 38,754 psi | 61% | 2766 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 96% | 34,287 psi | 54% | 2733 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 32,489 psi | 51% | 2572 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 43,845 psi | 69% | 2858 fps | 99.7% |
| Winchester 760 | <<locked>> | 94% | 46,325 psi | 73% | 2943 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,161 psi | 63% | 2769 fps | 98.2% |
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 GMX. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,179 fps; across all powders the maximum-charge window runs from 1,854 fps to 3,179 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 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 | Hornady GMX 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.