Load Specifications
Bullet:.308 | 165gr | Geco EXPRESS
Bullet Manufacturer:Geco
Bullet Weight:165 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:1:13.5
Load data in caliber .300 WSM with .308 | 165gr | Geco EXPRESS bullet and 102 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance 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>> | 82% | 54,853 psi | 86% | 2789 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 57,551 psi | 90% | 2864 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 57,653 psi | 90% | 2920 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 57,305 psi | 90% | 2877 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 44,527 psi | 70% | 2772 fps | 97.1% |
| Accurate 4064 | <<locked>> | 90% | 57,522 psi | 90% | 2913 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 53,925 psi | 85% | 2953 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 86% | 57,595 psi | 90% | 2949 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 55,158 psi | 86% | 2897 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 52,098 psi | 82% | 2927 fps | 95.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 56,231 psi | 88% | 2894 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 57,696 psi | 90% | 2867 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 57,493 psi | 90% | 3074 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,172 psi | 86% | 2917 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,782 psi | 87% | 2943 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 55,114 psi | 86% | 3012 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 56,507 psi | 89% | 3048 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 51,126 psi | 80% | 2913 fps | 95.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,293 psi | 66% | 2802 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,601 psi | 75% | 2972 fps | 99.1% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 57,421 psi | 90% | 2963 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 56,101 psi | 88% | 2936 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,782 psi | 87% | 2907 fps | 97.8% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,317 psi | 85% | 2825 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 56,028 psi | 88% | 2927 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 56,347 psi | 88% | 2874 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 56,782 psi | 89% | 2949 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 54,549 psi | 85% | 2972 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 96% | 55,042 psi | 86% | 2933 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 84% | 54,491 psi | 85% | 2904 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 54,882 psi | 86% | 2933 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,418 psi | 85% | 2943 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 57,421 psi | 90% | 3045 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,752 psi | 56% | 1791 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 54,737 psi | 86% | 2894 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 56,884 psi | 89% | 2917 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 57,305 psi | 90% | 2920 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 92% | 56,521 psi | 89% | 2894 fps | 98.3% |
| IMR 4350 | <<locked>> | 98% | 56,260 psi | 88% | 2933 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 94% | 57,551 psi | 90% | 2936 fps | 98.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,808 psi | 81% | 2904 fps | 99.6% |
| IMR 4895 | <<locked>> | 88% | 57,232 psi | 90% | 2972 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 56,231 psi | 88% | 2894 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 57,653 psi | 90% | 2920 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,666 psi | 89% | 2871 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 54,520 psi | 85% | 2874 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 57,116 psi | 90% | 2930 fps | 99.3% |
| Lovex S070 | <<locked>> | 96% | 54,766 psi | 86% | 2917 fps | 98.3% |
| Norma 201 | <<locked>> | 86% | 56,173 psi | 88% | 2890 fps | 100% |
| Norma 202 | <<locked>> | 86% | 56,739 psi | 89% | 2890 fps | 100% |
| Norma 203B | <<locked>> | 88% | 54,998 psi | 86% | 2927 fps | 100% |
| Norma 204 | <<locked>> | 98% | 57,130 psi | 90% | 2986 fps | 96.9% |
| Norma MRPᴾ | <<locked>> | 100% | 47,326 psi | 74% | 2927 fps | 96.7% |
| Norma URP | <<locked>> | 98% | 56,666 psi | 89% | 2995 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 88% | 55,608 psi | 87% | 2953 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 55,303 psi | 87% | 2992 fps | 99% |
| Ramshot TAC | <<locked>> | 84% | 56,536 psi | 89% | 2917 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 84% | 56,463 psi | 88% | 2936 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 57,116 psi | 90% | 2897 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,216 psi | 57% | 1831 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,898 psi | 89% | 2930 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 56,420 psi | 88% | 3012 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 56,144 psi | 88% | 3045 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 57,580 psi | 90% | 3031 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 56,652 psi | 89% | 3061 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 84% | 57,029 psi | 89% | 2867 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,739 psi | 89% | 2890 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 55,941 psi | 88% | 2930 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 49,922 psi | 78% | 2894 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 94% | 55,782 psi | 87% | 2907 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 96% | 57,116 psi | 90% | 2930 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 86% | 57,653 psi | 90% | 2920 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 54,520 psi | 85% | 2874 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 54,766 psi | 86% | 2917 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 54,085 psi | 85% | 2936 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,187 psi | 86% | 2894 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,796 psi | 87% | 2917 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 57,392 psi | 90% | 2822 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 54,563 psi | 86% | 2779 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 57,624 psi | 90% | 2887 fps | 98.5% |
| Somchem S321 | <<locked>> | 82% | 57,566 psi | 90% | 2927 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 56,869 psi | 89% | 2822 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,795 psi | 86% | 2884 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 56,028 psi | 88% | 2923 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 54,708 psi | 86% | 2992 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,647 psi | 79% | 2874 fps | 96.9% |
| Unknown powder | <<locked>> | 96% | 57,493 psi | 90% | 3002 fps | 99.7% |
| Vihtavuori N130 | <<locked>> | 82% | 55,941 psi | 88% | 2769 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 57,130 psi | 90% | 2802 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 56,681 psi | 89% | 2851 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,391 psi | 88% | 2858 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 57,537 psi | 90% | 2904 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,476 psi | 85% | 2917 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 82% | 55,999 psi | 88% | 2900 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 56,144 psi | 88% | 2884 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,868 psi | 86% | 2969 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,804 psi | 73% | 2877 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 55,477 psi | 87% | 2910 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,566 psi | 90% | 2949 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,549 psi | 85% | 2972 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,927 psi | 59% | 2818 fps | 99.6% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 52,895 psi | 83% | 2897 fps | 96.1% |
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% | 51,488 psi | 81% | 2743 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,440 psi | 70% | 2674 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,082 psi | 78% | 2812 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 44,309 psi | 69% | 2657 fps | 95% |
| Accurate 3100 | <<locked>> | 96% | 38,754 psi | 61% | 2654 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 42,018 psi | 66% | 2671 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 33,301 psi | 52% | 2549 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 47,514 psi | 74% | 2785 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 40,495 psi | 63% | 2635 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 98% | 48,892 psi | 77% | 2867 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,559 psi | 78% | 2789 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,531 psi | 79% | 2772 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,526 psi | 68% | 2828 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,393 psi | 63% | 2661 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,134 psi | 68% | 2720 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 33,272 psi | 52% | 2559 fps | 95.5% |
| Alliant Reloder-17 | 56.1 gr | 80% | 35,027 psi | 55% | 2635 fps | 98% |
| Alliant Reloder-19 | <<locked>> | 98% | 48,037 psi | 75% | 2858 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 88% | 29,051 psi | 46% | 2467 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 92% | 35,882 psi | 56% | 2713 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,963 psi | 74% | 2792 fps | 99% |
| Bofors RP3 | <<locked>> | 80% | 40,147 psi | 63% | 2664 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 43,555 psi | 68% | 2687 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,126 psi | 80% | 2776 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,863 psi | 77% | 2815 fps | 100% |
| Hodgdon H322 | <<locked>> | 80% | 52,881 psi | 83% | 2825 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,886 psi | 64% | 2667 fps | 97.3% |
| Hodgdon H414 | <<locked>> | 84% | 41,408 psi | 65% | 2730 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 92% | 48,689 psi | 76% | 2825 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 47,964 psi | 75% | 2795 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,761 psi | 45% | 2405 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,669 psi | 65% | 2720 fps | 99.5% |
| Hodgdon Superformance | 65.2 gr | 88% | 43,105 psi | 68% | 2789 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,643 psi | 42% | 1601 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,670 psi | 67% | 2684 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 44,193 psi | 69% | 2723 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,755 psi | 62% | 2612 fps | 98.2% |
| IMR 4166 Enduron | <<locked>> | 82% | 41,901 psi | 66% | 2631 fps | 95.2% |
| IMR 4350 | <<locked>> | 90% | 43,830 psi | 69% | 2717 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,337 psi | 66% | 2667 fps | 95.2% |
| IMR 4831 | <<locked>> | 86% | 33,228 psi | 52% | 2530 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 44,222 psi | 69% | 2753 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 49,559 psi | 78% | 2789 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,224 psi | 74% | 2766 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,268 psi | 74% | 2720 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 42,540 psi | 67% | 2674 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 37,260 psi | 58% | 2562 fps | 95.3% |
| Lovex S070 | <<locked>> | 88% | 42,612 psi | 67% | 2697 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 46,659 psi | 73% | 2736 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,079 psi | 74% | 2743 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,511 psi | 67% | 2710 fps | 99.1% |
| Norma 204 | <<locked>> | 94% | 49,734 psi | 78% | 2864 fps | 95.3% |
| Norma MRP | <<locked>> | 98% | 44,179 psi | 69% | 2864 fps | 95.8% |
| Norma URP | <<locked>> | 82% | 33,547 psi | 53% | 2549 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 42,293 psi | 66% | 2726 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 39,784 psi | 62% | 2703 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 49,545 psi | 78% | 2802 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,313 psi | 77% | 2822 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,388 psi | 84% | 2841 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,137 psi | 43% | 1640 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,205 psi | 65% | 2651 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,977 psi | 72% | 2835 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,260 psi | 58% | 2700 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 35,360 psi | 55% | 2621 fps | 95.8% |
| ReloadSwiss RS 70 | 61.2 gr | 86% | 37,666 psi | 59% | 2690 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 50,705 psi | 79% | 2776 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,309 psi | 69% | 2687 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 37,869 psi | 59% | 2608 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 98% | 46,760 psi | 73% | 2838 fps | 95% |
| Rottweil R 907 | <<locked>> | 86% | 43,555 psi | 68% | 2687 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 82% | 37,260 psi | 58% | 2562 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,224 psi | 74% | 2766 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,540 psi | 67% | 2674 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 42,612 psi | 67% | 2697 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,783 psi | 61% | 2657 fps | 98.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,066 psi | 75% | 2779 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,079 psi | 72% | 2756 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,674 psi | 75% | 2680 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,871 psi | 62% | 2546 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 41,640 psi | 65% | 2615 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 53,911 psi | 84% | 2874 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 47,471 psi | 74% | 2684 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,819 psi | 75% | 2772 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 38,537 psi | 60% | 2612 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 28,224 psi | 44% | 2444 fps | 96.8% |
| Somchem S385 | <<locked>> | 96% | 44,396 psi | 70% | 2762 fps | 95.3% |
| Unknown powder | <<locked>> | 82% | 36,390 psi | 57% | 2608 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 52,823 psi | 83% | 2726 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,063 psi | 71% | 2625 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,019 psi | 69% | 2664 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,947 psi | 69% | 2664 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,880 psi | 52% | 2461 fps | 98.5% |
| Vihtavuori N160 | <<locked>> | 80% | 33,968 psi | 53% | 2523 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 52,315 psi | 82% | 2844 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,569 psi | 68% | 2687 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,548 psi | 54% | 2569 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 88% | 31,372 psi | 49% | 2543 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,387 psi | 51% | 2470 fps | 97.2% |
| Winchester 748 | <<locked>> | 80% | 53,838 psi | 84% | 2897 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 41,408 psi | 65% | 2730 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 92% | 29,254 psi | 46% | 2549 fps | 96% |
| Winchester Supreme 780 | <<locked>> | 98% | 49,226 psi | 77% | 2838 fps | 95.2% |
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 102 powders for .300 WSM loaded with the .308 | 165gr | Geco EXPRESS. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,074 fps; across all powders the maximum-charge window runs from 1,791 fps to 3,074 fps. Accurate 3100 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 56–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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 70, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .300 WSM with the .308 | 165gr | Geco EXPRESS 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.