Load Specifications
Bullet:.308 | 150gr | Merlin Virtus
Bullet Manufacturer:Virtus
Bullet Weight:150 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Caliber:.300 RCM load data
Case Length (l3):2.09"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:75 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:12.5
Load data in caliber .300 RCM with .308 | 150gr | Merlin Virtus bullet and 102 powders. The key underlying parameters are shown in the table above.
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.
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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>> | 88% | 55,637 psi | 87% | 2897 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 53,896 psi | 84% | 2920 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 56,608 psi | 89% | 2959 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 55,898 psi | 88% | 2986 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 57,522 psi | 90% | 2953 fps | 96% |
| Accurate 4064 | <<locked>> | 96% | 56,463 psi | 88% | 3002 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 48,950 psi | 77% | 2956 fps | 98% |
| Accurate LT-30 | <<locked>> | 82% | 54,984 psi | 86% | 2841 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,448 psi | 87% | 2871 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 54,737 psi | 86% | 2992 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 96% | 55,724 psi | 87% | 2986 fps | 99.3% |
| ADI AR 2219 | <<locked>> | 82% | 56,130 psi | 88% | 2969 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 57,522 psi | 90% | 2999 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 57,711 psi | 90% | 2976 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 55,695 psi | 87% | 3058 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 54,505 psi | 85% | 3107 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 55,230 psi | 87% | 3009 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 84% | 55,361 psi | 87% | 2907 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 55,970 psi | 88% | 3028 fps | 99.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 48,211 psi | 76% | 2966 fps | 98.1% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 56,362 psi | 88% | 3133 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 54,230 psi | 85% | 2835 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 54,781 psi | 86% | 3005 fps | 99% |
| Bofors RP3 | <<locked>> | 96% | 55,738 psi | 87% | 3025 fps | 99.9% |
| Bofors RP7ᴾ | <<locked>> | 100% | 56,507 psi | 89% | 2986 fps | 96.1% |
| Hodgdon Benchmark | <<locked>> | 88% | 56,086 psi | 88% | 2933 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 56,782 psi | 89% | 3031 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 54,940 psi | 86% | 3071 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 84% | 54,621 psi | 86% | 2946 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 55,941 psi | 88% | 2976 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 57,203 psi | 90% | 3035 fps | 98.8% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 52,663 psi | 83% | 3015 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 90% | 55,230 psi | 87% | 3005 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 44,237 psi | 69% | 2841 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 54,244 psi | 85% | 3035 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,592 psi | 54% | 1811 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 56,695 psi | 89% | 3005 fps | 99.8% |
| IMR 3031 | <<locked>> | 90% | 54,824 psi | 86% | 2992 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 55,390 psi | 87% | 2972 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,956 psi | 88% | 2949 fps | 96.6% |
| IMR 4198 | <<locked>> | 84% | 55,709 psi | 87% | 2867 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 55,230 psi | 87% | 2969 fps | 96.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 46,601 psi | 73% | 2897 fps | 97.6% |
| IMR 4895 | <<locked>> | 94% | 57,377 psi | 90% | 3061 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 90% | 57,522 psi | 90% | 2999 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 53,954 psi | 85% | 2930 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 57,725 psi | 90% | 3018 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 54,752 psi | 86% | 2920 fps | 99.5% |
| Lovex S062 | <<locked>> | 94% | 54,665 psi | 86% | 2966 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 53,911 psi | 84% | 2956 fps | 97.6% |
| Lovex S070ᴾ | <<locked>> | 100% | 51,068 psi | 80% | 2927 fps | 95.9% |
| Norma 201 | <<locked>> | 92% | 56,739 psi | 89% | 2986 fps | 100% |
| Norma 202 | <<locked>> | 92% | 57,377 psi | 90% | 2992 fps | 100% |
| Norma 203B | <<locked>> | 94% | 55,056 psi | 86% | 3015 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 48,617 psi | 76% | 2949 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 94% | 56,072 psi | 88% | 3048 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 48,037 psi | 75% | 2940 fps | 95.9% |
| Ramshot TAC | <<locked>> | 88% | 54,621 psi | 86% | 2959 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 90% | 57,682 psi | 90% | 3038 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 86% | 55,259 psi | 87% | 2949 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,911 psi | 55% | 1854 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 57,203 psi | 90% | 2986 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 54,085 psi | 85% | 2956 fps | 96.9% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 56,550 psi | 89% | 3104 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 56,130 psi | 88% | 3136 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 48,791 psi | 76% | 2979 fps | 97.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 49,516 psi | 78% | 2999 fps | 97.2% |
| Rottweil R 901 | <<locked>> | 90% | 57,580 psi | 90% | 2972 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 57,159 psi | 90% | 2982 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 55,274 psi | 87% | 3009 fps | 99.8% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 56,507 psi | 89% | 2986 fps | 96.1% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 53,911 psi | 84% | 2956 fps | 97.6% |
| Shooters World Match Rifle | <<locked>> | 92% | 57,725 psi | 90% | 3018 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 54,665 psi | 86% | 2966 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 51,068 psi | 80% | 2927 fps | 95.9% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 57,159 psi | 90% | 2956 fps | 99.9% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 56,492 psi | 89% | 2979 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 57,653 psi | 90% | 3077 fps | 99.7% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 56,449 psi | 88% | 2930 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 56,362 psi | 88% | 2989 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 56,985 psi | 89% | 3018 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,332 psi | 87% | 2884 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 55,390 psi | 87% | 2877 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 54,534 psi | 85% | 2907 fps | 96.3% |
| Somchem S321 | <<locked>> | 86% | 55,419 psi | 87% | 2982 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 54,404 psi | 85% | 2877 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 55,970 psi | 88% | 2986 fps | 99.6% |
| Somchem S355 | <<locked>> | 98% | 55,985 psi | 88% | 3012 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 43,395 psi | 68% | 2897 fps | 99.5% |
| Vihtavuori N130 | <<locked>> | 86% | 55,376 psi | 87% | 2854 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,434 psi | 87% | 2867 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 56,449 psi | 88% | 2949 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 54,389 psi | 85% | 2920 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 57,725 psi | 90% | 2992 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 51,401 psi | 81% | 2953 fps | 98.2% |
| Vihtavuori N530 | <<locked>> | 88% | 54,592 psi | 86% | 2946 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 94% | 56,217 psi | 88% | 2966 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 50,328 psi | 79% | 2956 fps | 97.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 52,446 psi | 82% | 2940 fps | 99.7% |
| Winchester 748 | <<locked>> | 88% | 54,041 psi | 85% | 2995 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 52,663 psi | 83% | 3015 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 92% | 56,797 psi | 89% | 3025 fps | 99.9% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 43,018 psi | 67% | 2703 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,108 psi | 74% | 2815 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,259 psi | 55% | 2602 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 42,250 psi | 66% | 2759 fps | 99.7% |
| Accurate 2700 | <<locked>> | 92% | 54,027 psi | 85% | 2900 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 33,344 psi | 52% | 2582 fps | 99% |
| Accurate 4350 | <<locked>> | 94% | 39,276 psi | 62% | 2772 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 51,880 psi | 81% | 2799 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 52,315 psi | 82% | 2822 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 39,566 psi | 62% | 2707 fps | 97% |
| ADI AR 2208 | <<locked>> | 82% | 35,998 psi | 56% | 2605 fps | 95.1% |
| ADI AR 2219 | <<locked>> | 80% | 52,286 psi | 82% | 2913 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,684 psi | 65% | 2726 fps | 98.6% |
| Alliant AR-Comp | <<locked>> | 80% | 41,234 psi | 65% | 2733 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 48,472 psi | 76% | 2936 fps | 99.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 38,435 psi | 60% | 2779 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,967 psi | 52% | 2572 fps | 95.9% |
| Alliant Reloder-10x | <<locked>> | 80% | 48,849 psi | 77% | 2808 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,404 psi | 55% | 2631 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 94% | 40,030 psi | 63% | 2792 fps | 95.9% |
| Alliant Reloder-17 | <<locked>> | 86% | 34,679 psi | 54% | 2690 fps | 95.8% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,821 psi | 80% | 2785 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,667 psi | 61% | 2703 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 32,126 psi | 50% | 2562 fps | 95.8% |
| Bofors RP7 | <<locked>> | 98% | 53,011 psi | 83% | 2927 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,772 psi | 69% | 2726 fps | 99.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,016 psi | 63% | 2740 fps | 98.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,121 psi | 69% | 2881 fps | 97.7% |
| Hodgdon H322 | <<locked>> | 80% | 47,863 psi | 75% | 2844 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 48,762 psi | 76% | 2864 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 40,799 psi | 64% | 2743 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 98% | 49,066 psi | 77% | 2956 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 39,900 psi | 63% | 2720 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 34,142 psi | 54% | 2618 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,897 psi | 56% | 2680 fps | 97% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,788 psi | 40% | 1624 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,580 psi | 60% | 2677 fps | 97.3% |
| IMR 3031 | <<locked>> | 80% | 39,117 psi | 61% | 2730 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,346 psi | 55% | 2585 fps | 95.1% |
| IMR 4166 Enduron | <<locked>> | 88% | 49,153 psi | 77% | 2835 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 49,385 psi | 77% | 2776 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 51,909 psi | 81% | 2910 fps | 95.6% |
| IMR 4831 | <<locked>> | 94% | 38,116 psi | 60% | 2726 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 36,245 psi | 57% | 2664 fps | 96.1% |
| IMR 8208 XBR | <<locked>> | 80% | 41,684 psi | 65% | 2726 fps | 98.6% |
| Lovex D073.5 | <<locked>> | 80% | 46,905 psi | 74% | 2818 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 38,087 psi | 60% | 2687 fps | 99.2% |
| Lovex S060 | <<locked>> | 80% | 40,219 psi | 63% | 2654 fps | 97.2% |
| Lovex S062 | <<locked>> | 80% | 34,969 psi | 55% | 2592 fps | 97.1% |
| Lovex S065 | <<locked>> | 94% | 44,585 psi | 70% | 2789 fps | 95.5% |
| Lovex S070 | <<locked>> | 98% | 47,906 psi | 75% | 2871 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 38,754 psi | 61% | 2664 fps | 98.1% |
| Norma 202 | <<locked>> | 80% | 39,059 psi | 61% | 2684 fps | 99.6% |
| Norma 203B | <<locked>> | 80% | 34,809 psi | 55% | 2618 fps | 95.5% |
| Norma URP | <<locked>> | 94% | 39,856 psi | 62% | 2776 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 34,374 psi | 54% | 2625 fps | 95% |
| Ramshot Hunter | <<locked>> | 98% | 44,846 psi | 70% | 2877 fps | 95% |
| Ramshot TAC | <<locked>> | 82% | 44,759 psi | 70% | 2782 fps | 95.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,002 psi | 64% | 2746 fps | 97.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,252 psi | 71% | 2776 fps | 98.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,947 psi | 41% | 1660 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 46,992 psi | 74% | 2822 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 47,427 psi | 74% | 2841 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 36,738 psi | 58% | 2726 fps | 95.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 30,240 psi | 47% | 2575 fps | 96.4% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 39,479 psi | 62% | 2795 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 43,279 psi | 68% | 2874 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 42,337 psi | 66% | 2720 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 36,767 psi | 58% | 2612 fps | 97.6% |
| Rottweil R 903 | <<locked>> | 82% | 32,227 psi | 51% | 2559 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 98% | 53,011 psi | 83% | 2927 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 94% | 44,585 psi | 70% | 2789 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,087 psi | 60% | 2687 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 34,969 psi | 55% | 2592 fps | 97.1% |
| Shooters World SW4350 | <<locked>> | 98% | 47,906 psi | 75% | 2871 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 49,719 psi | 78% | 2838 fps | 99.5% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 52,794 psi | 83% | 2923 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 35,955 psi | 56% | 2674 fps | 95.8% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 49,719 psi | 78% | 2831 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 42,583 psi | 67% | 2749 fps | 95.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,218 psi | 60% | 2674 fps | 96.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,437 psi | 63% | 2635 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,272 psi | 52% | 2490 fps | 99.4% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 50,937 psi | 80% | 2851 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 44,889 psi | 70% | 2808 fps | 99.3% |
| Somchem S335 | <<locked>> | 80% | 39,958 psi | 63% | 2638 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 39,363 psi | 62% | 2690 fps | 96.9% |
| Somchem S355 | <<locked>> | 82% | 33,446 psi | 52% | 2575 fps | 95.6% |
| Somchem S365 | <<locked>> | 88% | 29,080 psi | 46% | 2543 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 45,919 psi | 72% | 2713 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,683 psi | 64% | 2638 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,911 psi | 56% | 2608 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,840 psi | 58% | 2615 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 80% | 29,646 psi | 46% | 2454 fps | 95.7% |
| Vihtavuori N160 | <<locked>> | 92% | 39,233 psi | 61% | 2723 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 41,771 psi | 65% | 2726 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 80% | 35,447 psi | 56% | 2598 fps | 99% |
| Vihtavuori N550 | <<locked>> | 94% | 41,191 psi | 65% | 2782 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 32,677 psi | 51% | 2539 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 40,886 psi | 64% | 2766 fps | 99.1% |
| Winchester 760 | <<locked>> | 98% | 49,342 psi | 77% | 2959 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,536 psi | 59% | 2677 fps | 97.1% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 102 powders for .300 RCM loaded with the .308 | 150gr | Merlin Virtus. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,136 fps; across all powders the maximum-charge window runs from 1,811 fps to 3,136 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 150.0 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-17 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.