Load Specifications
Bullet:.308 | 155gr | Merlin Virtus
Bullet Manufacturer:Virtus
Bullet Weight:155 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:1:12.5
Load data in caliber .300 WSM with .308 | 155gr | Merlin Virtus 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 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>> | 84% | 54,201 psi | 85% | 2874 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 56,318 psi | 88% | 2953 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 55,985 psi | 88% | 2940 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,855 psi | 89% | 3002 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 57,087 psi | 89% | 2949 fps | 97.1% |
| Accurate 4064 | <<locked>> | 92% | 56,057 psi | 88% | 2989 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 56,594 psi | 89% | 3081 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 88% | 57,014 psi | 89% | 3031 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 54,766 psi | 86% | 2979 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 56,130 psi | 88% | 2982 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 56,913 psi | 89% | 2953 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 57,319 psi | 90% | 3159 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 54,650 psi | 86% | 3002 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 57,130 psi | 90% | 2927 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,071 psi | 86% | 3018 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,389 psi | 85% | 3087 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 96% | 55,738 psi | 87% | 3130 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,609 psi | 61% | 2799 fps | 98.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,207 psi | 68% | 2959 fps | 97.5% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 57,290 psi | 90% | 3048 fps | 99.7% |
| Bofors RP3 | <<locked>> | 92% | 54,955 psi | 86% | 3012 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 55,492 psi | 87% | 2982 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,360 psi | 85% | 2913 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 55,463 psi | 87% | 3009 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 53,693 psi | 84% | 3054 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 84% | 55,999 psi | 88% | 2963 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 56,231 psi | 88% | 3028 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 96% | 57,711 psi | 90% | 3107 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 98% | 54,679 psi | 86% | 3009 fps | 96.2% |
| Hodgdon H4895 | <<locked>> | 88% | 57,638 psi | 90% | 3041 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,343 psi | 79% | 2953 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 57,348 psi | 90% | 3077 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 57,188 psi | 90% | 3123 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,244 psi | 55% | 1837 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 54,360 psi | 85% | 2976 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 55,840 psi | 88% | 2999 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 56,637 psi | 89% | 2995 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 94% | 56,318 psi | 88% | 2972 fps | 97.7% |
| IMR 4198 | <<locked>> | 82% | 57,348 psi | 90% | 2884 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 55,651 psi | 87% | 3005 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 96% | 57,522 psi | 90% | 3018 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 47,369 psi | 74% | 2913 fps | 98.6% |
| IMR 4895 | <<locked>> | 90% | 56,492 psi | 89% | 3051 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 56,130 psi | 88% | 2982 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 56,159 psi | 88% | 2963 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 56,855 psi | 89% | 3002 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 56,550 psi | 89% | 2956 fps | 99.9% |
| Lovex S062 | <<locked>> | 92% | 57,261 psi | 90% | 3005 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 56,695 psi | 89% | 3009 fps | 98.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 57,624 psi | 90% | 3045 fps | 98.2% |
| Norma 201 | <<locked>> | 88% | 55,448 psi | 87% | 2972 fps | 100% |
| Norma 202 | <<locked>> | 88% | 56,391 psi | 88% | 2976 fps | 100% |
| Norma 203B | <<locked>> | 90% | 54,244 psi | 85% | 3005 fps | 99.9% |
| Norma 204ᴾ | <<locked>> | 100% | 56,739 psi | 89% | 3061 fps | 96% |
| Norma URPᴾ | <<locked>> | 100% | 55,666 psi | 87% | 3068 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 90% | 55,245 psi | 87% | 3038 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,578 psi | 86% | 3064 fps | 98.4% |
| Ramshot TAC | <<locked>> | 86% | 56,608 psi | 89% | 3002 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 86% | 56,101 psi | 88% | 3018 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 57,029 psi | 89% | 2982 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,592 psi | 56% | 1880 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,506 psi | 87% | 2959 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 56,536 psi | 89% | 3009 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 55,709 psi | 87% | 3091 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 55,492 psi | 87% | 3127 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 56,478 psi | 89% | 3104 fps | 99.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 56,130 psi | 88% | 3136 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 86% | 56,231 psi | 88% | 2949 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 56,086 psi | 88% | 2969 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 54,810 psi | 86% | 3002 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 55,492 psi | 87% | 2982 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 98% | 56,695 psi | 89% | 3009 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 88% | 56,855 psi | 89% | 3002 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 57,261 psi | 90% | 3005 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 57,624 psi | 90% | 3045 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 56,942 psi | 89% | 3068 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 54,955 psi | 86% | 2976 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 55,521 psi | 87% | 2999 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 57,232 psi | 90% | 2910 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 57,580 psi | 90% | 2907 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 57,087 psi | 89% | 2959 fps | 97.8% |
| Somchem S321 | <<locked>> | 84% | 57,464 psi | 90% | 3015 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 56,420 psi | 88% | 2907 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 54,389 psi | 85% | 2966 fps | 99.8% |
| Somchem S355 | <<locked>> | 94% | 55,158 psi | 86% | 3002 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 49,792 psi | 78% | 3012 fps | 100% |
| Unknown powder | <<locked>> | 98% | 56,855 psi | 89% | 3077 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 84% | 55,738 psi | 87% | 2858 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 56,898 psi | 89% | 2890 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 55,898 psi | 88% | 2936 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 56,115 psi | 88% | 2943 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 56,579 psi | 89% | 2982 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 57,493 psi | 90% | 3048 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 55,854 psi | 88% | 2989 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,782 psi | 87% | 2972 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 57,638 psi | 90% | 3097 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,119 psi | 66% | 2877 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,085 psi | 86% | 2989 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 57,377 psi | 90% | 3038 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 57,711 psi | 90% | 3107 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,403 psi | 54% | 2782 fps | 97.8% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,884 psi | 89% | 3028 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% | 47,848 psi | 75% | 2779 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,562 psi | 82% | 2897 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,972 psi | 63% | 2687 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,079 psi | 72% | 2838 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 49,908 psi | 78% | 2835 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 37,855 psi | 59% | 2677 fps | 99.9% |
| Accurate 4350 | <<locked>> | 86% | 34,316 psi | 54% | 2654 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 44,150 psi | 69% | 2808 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 80% | 37,449 psi | 59% | 2648 fps | 96.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,311 psi | 73% | 2818 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 46,630 psi | 73% | 2808 fps | 100% |
| Alliant Power Pro 2000-MR | 56.7 gr | 80% | 40,234 psi | 63% | 2835 fps | 97.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,970 psi | 58% | 2667 fps | 98.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 53,824 psi | 84% | 2877 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,827 psi | 62% | 2736 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 34,780 psi | 55% | 2674 fps | 95.2% |
| Alliant Reloder-17 | 55.8 gr | 80% | 31,937 psi | 50% | 2625 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 31,734 psi | 50% | 2618 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 37,246 psi | 58% | 2818 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,395 psi | 68% | 2808 fps | 97.9% |
| Bofors RP3 | <<locked>> | 80% | 36,550 psi | 57% | 2667 fps | 98.1% |
| Bofors RP7 | <<locked>> | 92% | 48,646 psi | 76% | 2864 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,051 psi | 75% | 2808 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,179 psi | 71% | 2838 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,067 psi | 78% | 2992 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 80% | 49,124 psi | 77% | 2861 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 37,550 psi | 59% | 2674 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 88% | 43,656 psi | 68% | 2858 fps | 95% |
| Hodgdon H4350 | <<locked>> | 96% | 51,082 psi | 80% | 2946 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 44,570 psi | 70% | 2818 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,704 psi | 47% | 2507 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,276 psi | 60% | 2736 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 94% | 49,182 psi | 77% | 2982 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,136 psi | 41% | 1644 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,711 psi | 62% | 2703 fps | 98.4% |
| IMR 3031 | <<locked>> | 80% | 40,408 psi | 63% | 2746 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,608 psi | 57% | 2621 fps | 96.7% |
| IMR 4166 Enduron | <<locked>> | 86% | 44,164 psi | 69% | 2753 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 54,027 psi | 85% | 2838 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 49,095 psi | 77% | 2894 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 44,730 psi | 70% | 2792 fps | 95% |
| IMR 4831 | <<locked>> | 90% | 34,156 psi | 54% | 2631 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 40,814 psi | 64% | 2769 fps | 98.3% |
| IMR 8208 XBR | <<locked>> | 80% | 46,311 psi | 73% | 2818 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 52,431 psi | 82% | 2907 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,120 psi | 68% | 2782 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,367 psi | 70% | 2746 fps | 98.9% |
| Lovex S062 | <<locked>> | 80% | 39,262 psi | 62% | 2690 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 41,249 psi | 65% | 2730 fps | 95.7% |
| Lovex S070 | <<locked>> | 92% | 44,556 psi | 70% | 2815 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 42,975 psi | 67% | 2756 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 43,424 psi | 68% | 2769 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,189 psi | 61% | 2723 fps | 97.9% |
| Norma 204 | <<locked>> | 98% | 52,852 psi | 83% | 2999 fps | 95.1% |
| Norma URP | <<locked>> | 86% | 34,867 psi | 55% | 2661 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 38,899 psi | 61% | 2736 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 92% | 41,698 psi | 65% | 2822 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 46,354 psi | 73% | 2825 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,672 psi | 72% | 2841 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,067 psi | 78% | 2871 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,513 psi | 42% | 1683 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,880 psi | 81% | 2904 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 43,424 psi | 68% | 2776 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,930 psi | 66% | 2841 fps | 98% |
| ReloadSwiss RS 60 | 55.8 gr | 80% | 34,040 psi | 53% | 2697 fps | 99% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 36,738 psi | 58% | 2733 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 39,726 psi | 62% | 2812 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 46,789 psi | 73% | 2802 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,973 psi | 64% | 2707 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 34,243 psi | 54% | 2608 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 92% | 48,646 psi | 76% | 2864 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,249 psi | 65% | 2730 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,120 psi | 68% | 2782 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,262 psi | 62% | 2690 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 92% | 44,556 psi | 70% | 2815 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,418 psi | 56% | 2661 fps | 96.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,498 psi | 70% | 2795 fps | 97.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,641 psi | 67% | 2772 fps | 98.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,556 psi | 70% | 2713 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,999 psi | 58% | 2572 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 43,772 psi | 69% | 2733 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 50,038 psi | 78% | 2900 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,034 psi | 69% | 2713 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,150 psi | 69% | 2789 fps | 98.8% |
| Somchem S355 | <<locked>> | 80% | 35,157 psi | 55% | 2615 fps | 97.2% |
| Somchem S365 | <<locked>> | 82% | 27,064 psi | 42% | 2480 fps | 95.2% |
| Unknown powder | <<locked>> | 86% | 38,014 psi | 60% | 2726 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 49,356 psi | 77% | 2766 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,061 psi | 66% | 2661 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,466 psi | 63% | 2690 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,727 psi | 64% | 2694 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 29,994 psi | 47% | 2464 fps | 96.9% |
| Vihtavuori N160 | <<locked>> | 84% | 35,520 psi | 56% | 2641 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 48,805 psi | 76% | 2874 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 40,306 psi | 63% | 2710 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 36,027 psi | 56% | 2684 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 94% | 34,301 psi | 54% | 2700 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,704 psi | 47% | 2464 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 49,748 psi | 78% | 2923 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 43,656 psi | 68% | 2858 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 96% | 30,023 psi | 47% | 2635 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,866 psi | 83% | 2969 fps | 99.9% |
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 | 155gr | Merlin Virtus. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,159 fps; across all powders the maximum-charge window runs from 1,837 fps to 3,159 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 54–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.308" calls for a 1:12.5 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. ReloadSwiss RS 60, Alliant Reloder-17, Alliant Power Pro 2000-MR rank at the top here: for .300 WSM with the .308 | 155gr | Merlin Virtus 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.