Load Specifications
Bullet Manufacturer:Warner Tool Co
Bullet Weight:155.5 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:1:10.0
Load data in caliber .300 WSM with .308 | 155.5gr | Warner Tool Co. Flat Line bullet and 104 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% | 56,768 psi | 89% | 2884 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,100 psi | 86% | 2907 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 55,013 psi | 86% | 2900 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,405 psi | 87% | 2959 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 55,796 psi | 87% | 2900 fps | 96.4% |
| Accurate 4064 | <<locked>> | 92% | 55,114 psi | 86% | 2949 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 54,723 psi | 86% | 3028 fps | 99.3% |
| ADI AR 2206H | <<locked>> | 88% | 55,753 psi | 87% | 2982 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 94% | 56,855 psi | 89% | 2982 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,723 psi | 86% | 2933 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 55,535 psi | 87% | 2913 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 56,623 psi | 89% | 3045 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,376 psi | 87% | 3104 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 56,521 psi | 89% | 3002 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 56,275 psi | 88% | 2887 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 57,188 psi | 90% | 3025 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,765 psi | 83% | 3031 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 98% | 57,667 psi | 90% | 3130 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,449 psi | 59% | 2743 fps | 97.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,887 psi | 66% | 2904 fps | 96.6% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,506 psi | 87% | 2995 fps | 99.4% |
| Bofors RP3 | <<locked>> | 94% | 57,508 psi | 90% | 3022 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 57,537 psi | 90% | 2982 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,579 psi | 89% | 2917 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 57,740 psi | 90% | 3018 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 56,115 psi | 88% | 3068 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 84% | 54,665 psi | 86% | 2920 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,752 psi | 86% | 2976 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 96% | 55,869 psi | 88% | 3048 fps | 97.5% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 56,318 psi | 88% | 3005 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 88% | 56,275 psi | 88% | 2995 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,733 psi | 76% | 2900 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 55,608 psi | 87% | 3025 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 55,158 psi | 86% | 3058 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,201 psi | 55% | 1811 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 56,260 psi | 88% | 2976 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 54,578 psi | 86% | 2956 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 55,317 psi | 87% | 2949 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 94% | 55,013 psi | 86% | 2920 fps | 97.2% |
| IMR 4198 | <<locked>> | 82% | 56,014 psi | 88% | 2841 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 54,215 psi | 85% | 2953 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,854 psi | 88% | 2963 fps | 97.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 45,876 psi | 72% | 2861 fps | 98.1% |
| IMR 4895 | <<locked>> | 90% | 55,245 psi | 87% | 3005 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 54,723 psi | 86% | 2933 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 55,042 psi | 86% | 2920 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,405 psi | 87% | 2959 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,434 psi | 87% | 2910 fps | 99.8% |
| Lovex S062 | <<locked>> | 92% | 56,072 psi | 88% | 2959 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,187 psi | 86% | 2956 fps | 98.4% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,956 psi | 88% | 2989 fps | 97.6% |
| Norma 201 | <<locked>> | 88% | 54,534 psi | 85% | 2927 fps | 100% |
| Norma 202 | <<locked>> | 88% | 54,998 psi | 86% | 2930 fps | 100% |
| Norma 203B | <<locked>> | 92% | 56,333 psi | 88% | 3012 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 53,708 psi | 84% | 3012 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 92% | 57,058 psi | 89% | 3038 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,765 psi | 83% | 3005 fps | 97.7% |
| Ramshot TAC | <<locked>> | 86% | 55,201 psi | 87% | 2949 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,752 psi | 86% | 2969 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,941 psi | 88% | 2936 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,621 psi | 56% | 1854 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 54,215 psi | 85% | 2913 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,245 psi | 87% | 2959 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 53,954 psi | 85% | 3038 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 57,203 psi | 90% | 3130 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,215 psi | 85% | 3045 fps | 99.1% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,273 psi | 85% | 3074 fps | 98.9% |
| Rottweil R 901 | <<locked>> | 86% | 55,434 psi | 87% | 2910 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,911 psi | 86% | 2923 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 57,072 psi | 89% | 3009 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 57,537 psi | 90% | 2982 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,187 psi | 86% | 2956 fps | 98.4% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,405 psi | 87% | 2959 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 56,072 psi | 88% | 2959 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,956 psi | 88% | 2989 fps | 97.6% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 57,609 psi | 90% | 2936 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,172 psi | 86% | 3018 fps | 99.8% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 57,188 psi | 90% | 2910 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 57,406 psi | 90% | 2986 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 57,653 psi | 90% | 3005 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 56,217 psi | 88% | 2867 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 56,289 psi | 88% | 2864 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,738 psi | 87% | 2907 fps | 97.3% |
| Somchem S321 | <<locked>> | 84% | 56,072 psi | 88% | 2969 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,434 psi | 87% | 2864 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 56,666 psi | 89% | 2972 fps | 99.9% |
| Somchem S355 | <<locked>> | 96% | 57,508 psi | 90% | 3009 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,240 psi | 76% | 2963 fps | 100% |
| Unknown powder | <<locked>> | 98% | 54,853 psi | 86% | 3022 fps | 98.9% |
| Vihtavuori N130 | <<locked>> | 84% | 54,737 psi | 86% | 2818 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,448 psi | 87% | 2844 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 54,592 psi | 86% | 2894 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,810 psi | 86% | 2900 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 55,056 psi | 86% | 2933 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,579 psi | 87% | 2992 fps | 99.2% |
| Vihtavuori N530 | <<locked>> | 84% | 54,578 psi | 86% | 2943 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 54,462 psi | 85% | 2927 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,869 psi | 88% | 3045 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,785 psi | 64% | 2828 fps | 97.6% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 57,174 psi | 90% | 2992 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,767 psi | 87% | 2992 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,869 psi | 88% | 3048 fps | 97.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,620 psi | 53% | 2726 fps | 96.8% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,245 psi | 87% | 2979 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% | 46,963 psi | 74% | 2740 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 51,590 psi | 81% | 2858 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,653 psi | 62% | 2657 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,078 psi | 71% | 2795 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 52,286 psi | 82% | 2844 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 37,507 psi | 59% | 2648 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 35,984 psi | 56% | 2674 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 43,265 psi | 68% | 2762 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 80% | 36,956 psi | 58% | 2608 fps | 96.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,281 psi | 71% | 2772 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 45,440 psi | 71% | 2769 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,924 psi | 83% | 2986 fps | 99.9% |
| Alliant Power Pro 2000-MR | 53.9 gr | 80% | 39,204 psi | 61% | 2782 fps | 96.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,347 psi | 57% | 2628 fps | 97.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,953 psi | 83% | 2841 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,986 psi | 61% | 2690 fps | 97% |
| Alliant Reloder-16 | <<locked>> | 88% | 36,376 psi | 57% | 2687 fps | 95.4% |
| Alliant Reloder-17 | 53.1 gr | 80% | 31,372 psi | 49% | 2582 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 96% | 33,272 psi | 52% | 2635 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 98% | 38,972 psi | 61% | 2831 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,467 psi | 67% | 2762 fps | 97.4% |
| Bofors RP3 | <<locked>> | 80% | 35,940 psi | 56% | 2631 fps | 97.7% |
| Bofors RP7 | <<locked>> | 94% | 50,734 psi | 80% | 2871 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,253 psi | 74% | 2769 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,005 psi | 69% | 2792 fps | 99.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,617 psi | 76% | 2943 fps | 99% |
| Hodgdon H322 | <<locked>> | 80% | 48,269 psi | 76% | 2822 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 39,305 psi | 62% | 2687 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 90% | 45,542 psi | 71% | 2867 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 98% | 53,026 psi | 83% | 2953 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 43,613 psi | 68% | 2776 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 31,285 psi | 49% | 2523 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,246 psi | 58% | 2687 fps | 98.1% |
| Hodgdon Superformance | <<locked>> | 94% | 47,761 psi | 75% | 2927 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,324 psi | 41% | 1621 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,899 psi | 61% | 2661 fps | 98% |
| IMR 3031 | <<locked>> | 80% | 39,508 psi | 62% | 2703 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,042 psi | 56% | 2582 fps | 96.2% |
| IMR 4166 Enduron | <<locked>> | 88% | 45,847 psi | 72% | 2756 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 52,939 psi | 83% | 2799 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 50,836 psi | 80% | 2897 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 46,615 psi | 73% | 2802 fps | 95.2% |
| IMR 4831 | <<locked>> | 92% | 35,694 psi | 56% | 2648 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 39,943 psi | 63% | 2723 fps | 97.9% |
| IMR 8208 XBR | <<locked>> | 80% | 45,281 psi | 71% | 2772 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 80% | 51,300 psi | 80% | 2864 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,351 psi | 66% | 2746 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 43,584 psi | 68% | 2703 fps | 98.6% |
| Lovex S062 | <<locked>> | 80% | 38,638 psi | 61% | 2651 fps | 98.6% |
| Lovex S065 | <<locked>> | 88% | 40,611 psi | 64% | 2687 fps | 95.2% |
| Lovex S070 | <<locked>> | 94% | 46,528 psi | 73% | 2828 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 42,395 psi | 66% | 2717 fps | 99.2% |
| Norma 202 | <<locked>> | 80% | 42,670 psi | 67% | 2726 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,377 psi | 60% | 2680 fps | 97.4% |
| Norma URP | <<locked>> | 88% | 36,332 psi | 57% | 2674 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 37,869 psi | 59% | 2690 fps | 97.1% |
| Ramshot Hunter | <<locked>> | 94% | 43,192 psi | 68% | 2828 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 45,310 psi | 71% | 2776 fps | 96.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,744 psi | 70% | 2799 fps | 98.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,139 psi | 77% | 2825 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,571 psi | 42% | 1660 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,792 psi | 80% | 2861 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 45,324 psi | 71% | 2782 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,872 psi | 64% | 2795 fps | 97.5% |
| ReloadSwiss RS 60 | 53.1 gr | 80% | 33,402 psi | 52% | 2651 fps | 98.6% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 38,377 psi | 60% | 2749 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 41,292 psi | 65% | 2818 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 46,354 psi | 73% | 2766 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,350 psi | 63% | 2664 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 80% | 33,823 psi | 53% | 2572 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 94% | 50,734 psi | 80% | 2871 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 40,611 psi | 64% | 2687 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,351 psi | 66% | 2746 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 38,638 psi | 61% | 2651 fps | 98.6% |
| Shooters World SW4350 | <<locked>> | 94% | 46,528 psi | 73% | 2828 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 53,635 psi | 84% | 2881 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,780 psi | 55% | 2621 fps | 96.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 53,737 psi | 84% | 2861 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,511 psi | 68% | 2746 fps | 96.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,887 psi | 66% | 2730 fps | 98.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,903 psi | 69% | 2674 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,419 psi | 57% | 2536 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 45,774 psi | 72% | 2743 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 49,066 psi | 77% | 2858 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 43,366 psi | 68% | 2674 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,250 psi | 68% | 2746 fps | 98.4% |
| Somchem S355 | <<locked>> | 80% | 34,621 psi | 54% | 2579 fps | 96.8% |
| Somchem S365 | <<locked>> | 84% | 28,587 psi | 45% | 2507 fps | 95.7% |
| Unknown powder | <<locked>> | 88% | 39,624 psi | 62% | 2736 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 48,486 psi | 76% | 2726 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,205 psi | 65% | 2621 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,769 psi | 62% | 2654 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,001 psi | 63% | 2654 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 29,646 psi | 46% | 2431 fps | 96.5% |
| Vihtavuori N160 | <<locked>> | 86% | 37,246 psi | 58% | 2657 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 47,761 psi | 75% | 2828 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 39,581 psi | 62% | 2671 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 37,594 psi | 59% | 2700 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 94% | 33,373 psi | 52% | 2654 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 31,415 psi | 49% | 2487 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 48,530 psi | 76% | 2881 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 45,542 psi | 71% | 2867 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 98% | 31,546 psi | 49% | 2657 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,517 psi | 81% | 2920 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 104 powders for .300 WSM loaded with the .308 | 155.5gr | Warner Tool Co. Flat Line. Alliant Reloder-17 delivers the highest muzzle velocity at 3,130 fps; across all powders the maximum-charge window runs from 1,811 fps to 3,130 fps. Accurate 4350 gives the best case fill at 100 %, and 104 of the 104 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 155.5 gr projectile in 0.308" calls for a 1:10.0 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 Power Pro 2000-MR, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for .300 WSM with the .308 | 155.5gr | Warner Tool Co. Flat Line 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.