Load Specifications
Bullet:.308 | 155gr | Merlin Virtus
Bullet Manufacturer:Virtus
Bullet Weight:155 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Case Length (l3):2.003"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:74 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:65,000 psi
Recommended Twist Rate:1:12.5
Load data in caliber .300 Rem. SA Ultra Mag. with .308 | 155gr | Merlin Virtus bullet and 105 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 ReloadSwiss RS 52.
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>> | 88% | 57,072 psi | 88% | 2871 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 55,390 psi | 85% | 2897 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 58,392 psi | 90% | 2933 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 57,551 psi | 89% | 2963 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 55,419 psi | 85% | 2884 fps | 96% |
| Accurate 4064 | <<locked>> | 96% | 58,189 psi | 90% | 2979 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 50,705 psi | 78% | 2946 fps | 98.6% |
| Accurate LT-30 | <<locked>> | 82% | 56,159 psi | 86% | 2815 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 56,623 psi | 87% | 2844 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 56,159 psi | 86% | 2969 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 96% | 57,159 psi | 88% | 2966 fps | 99.6% |
| ADI AR 2219 | <<locked>> | 82% | 57,609 psi | 89% | 2943 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 55,390 psi | 85% | 2923 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 55,854 psi | 86% | 2904 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 57,261 psi | 88% | 3038 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 56,101 psi | 86% | 3091 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 56,811 psi | 87% | 2986 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 56,710 psi | 87% | 2877 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 57,479 psi | 88% | 3009 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 49,603 psi | 76% | 2953 fps | 98.7% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 57,812 psi | 89% | 3110 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,954 psi | 54% | 2664 fps | 96.3% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 55,463 psi | 85% | 2808 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 56,318 psi | 87% | 2986 fps | 99.3% |
| Bofors RP3 | <<locked>> | 96% | 57,435 psi | 88% | 3005 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 58,030 psi | 89% | 2969 fps | 96.8% |
| Hodgdon Benchmark | <<locked>> | 88% | 57,392 psi | 88% | 2910 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 58,421 psi | 90% | 3009 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 56,652 psi | 87% | 3054 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 84% | 56,072 psi | 86% | 2920 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 57,421 psi | 88% | 2949 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 55,158 psi | 85% | 2963 fps | 98.8% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 54,317 psi | 84% | 3005 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 90% | 56,710 psi | 87% | 2982 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 45,643 psi | 70% | 2828 fps | 99.1% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 55,912 psi | 86% | 3012 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 55,767 psi | 86% | 3041 fps | 96.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,737 psi | 53% | 1785 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 58,160 psi | 89% | 2982 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 56,478 psi | 87% | 2966 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 56,826 psi | 87% | 2953 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 92% | 57,305 psi | 88% | 2930 fps | 97.2% |
| IMR 4198 | <<locked>> | 84% | 56,971 psi | 88% | 2838 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 56,652 psi | 87% | 2949 fps | 97% |
| IMR 4831ᴾ | <<locked>> | 100% | 48,196 psi | 74% | 2884 fps | 98.3% |
| IMR 4895 | <<locked>> | 92% | 55,361 psi | 85% | 2989 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 88% | 55,390 psi | 85% | 2923 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 55,434 psi | 85% | 2910 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 55,666 psi | 86% | 2946 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 56,043 psi | 86% | 2897 fps | 99.8% |
| Lovex S062 | <<locked>> | 94% | 56,173 psi | 86% | 2946 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 55,405 psi | 85% | 2940 fps | 98.2% |
| Lovex S070ᴾ | <<locked>> | 100% | 52,562 psi | 81% | 2913 fps | 96.7% |
| Norma 201 | <<locked>> | 92% | 58,233 psi | 90% | 2966 fps | 100% |
| Norma 202 | <<locked>> | 90% | 55,274 psi | 85% | 2920 fps | 100% |
| Norma 203B | <<locked>> | 94% | 56,623 psi | 87% | 2995 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 50,212 psi | 77% | 2936 fps | 98.5% |
| Ramshot Big Game | <<locked>> | 94% | 57,783 psi | 89% | 3028 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 49,487 psi | 76% | 2930 fps | 96.8% |
| Ramshot TAC | <<locked>> | 88% | 55,999 psi | 86% | 2940 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 88% | 55,390 psi | 85% | 2959 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 86% | 56,623 psi | 87% | 2927 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,099 psi | 54% | 1827 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 58,639 psi | 90% | 2959 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 55,564 psi | 85% | 2940 fps | 97.6% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 58,059 psi | 89% | 3081 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 57,856 psi | 89% | 3117 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 50,459 psi | 78% | 2969 fps | 98.4% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 50,995 psi | 78% | 2992 fps | 98% |
| Rottweil R 901 | <<locked>> | 88% | 55,419 psi | 85% | 2894 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 58,668 psi | 90% | 2963 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 57,000 psi | 88% | 2989 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 58,030 psi | 89% | 2969 fps | 96.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 55,405 psi | 85% | 2940 fps | 98.2% |
| Shooters World Match Rifle | <<locked>> | 90% | 55,666 psi | 86% | 2946 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 56,173 psi | 86% | 2946 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 52,562 psi | 81% | 2913 fps | 96.7% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 58,595 psi | 90% | 2933 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 57,928 psi | 89% | 2953 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 55,695 psi | 86% | 3005 fps | 99.8% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 57,870 psi | 89% | 2904 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 57,943 psi | 89% | 2972 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 58,204 psi | 90% | 2992 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 56,666 psi | 87% | 2858 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 56,797 psi | 87% | 2854 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 56,043 psi | 86% | 2890 fps | 97% |
| Somchem S321 | <<locked>> | 86% | 56,898 psi | 88% | 2963 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 55,767 psi | 86% | 2851 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 57,537 psi | 89% | 2963 fps | 99.8% |
| Somchem S355 | <<locked>> | 98% | 57,595 psi | 89% | 2989 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 44,614 psi | 69% | 2881 fps | 99.8% |
| Vihtavuori N130 | <<locked>> | 86% | 56,376 psi | 87% | 2822 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 56,739 psi | 87% | 2841 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 58,088 psi | 89% | 2923 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 55,869 psi | 86% | 2897 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 55,608 psi | 86% | 2917 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 53,040 psi | 82% | 2940 fps | 98.8% |
| Vihtavuori N530 | <<locked>> | 88% | 56,028 psi | 86% | 2927 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 57,740 psi | 89% | 2943 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 51,924 psi | 80% | 2943 fps | 98.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 37,333 psi | 57% | 2740 fps | 96.3% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 53,940 psi | 83% | 2923 fps | 99.9% |
| Winchester 748 | <<locked>> | 88% | 55,637 psi | 86% | 2972 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 54,317 psi | 84% | 3005 fps | 96.9% |
| Winchester StaBALL Match | <<locked>> | 92% | 58,421 psi | 90% | 3005 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% | 44,179 psi | 68% | 2680 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 48,428 psi | 75% | 2792 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 36,405 psi | 56% | 2585 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 43,540 psi | 67% | 2743 fps | 99.9% |
| Accurate 2700 | <<locked>> | 90% | 51,750 psi | 80% | 2825 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 34,447 psi | 53% | 2569 fps | 99.4% |
| Accurate 4350 | <<locked>> | 92% | 37,942 psi | 58% | 2703 fps | 95.7% |
| Accurate LT-30 | <<locked>> | 80% | 52,707 psi | 81% | 2766 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 53,127 psi | 82% | 2792 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 40,654 psi | 63% | 2690 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 80% | 34,650 psi | 53% | 2536 fps | 95% |
| ADI AR 2219 | <<locked>> | 80% | 53,664 psi | 83% | 2887 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,772 psi | 66% | 2710 fps | 99.1% |
| Alliant AR-Comp | <<locked>> | 80% | 42,569 psi | 65% | 2710 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 49,864 psi | 77% | 2917 fps | 99.6% |
| Alliant Power Pro 2000-MR | 51.7 gr | 80% | 36,840 psi | 57% | 2703 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,982 psi | 52% | 2559 fps | 96.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,038 psi | 77% | 2782 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,463 psi | 56% | 2618 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 92% | 38,638 psi | 59% | 2723 fps | 95.9% |
| Alliant Reloder-17 | <<locked>> | 84% | 33,518 psi | 52% | 2625 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 98% | 32,808 psi | 50% | 2605 fps | 95.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 51,996 psi | 80% | 2762 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,813 psi | 61% | 2690 fps | 96.4% |
| Bofors RP3 | <<locked>> | 80% | 33,199 psi | 51% | 2552 fps | 96.6% |
| Bofors RP7 | <<locked>> | 96% | 51,053 psi | 79% | 2858 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,817 psi | 69% | 2707 fps | 99.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,234 psi | 63% | 2723 fps | 99.2% |
| Hodgdon CFE223 | <<locked>> | 80% | 45,484 psi | 70% | 2867 fps | 98.3% |
| Hodgdon H322 | <<locked>> | 80% | 49,153 psi | 76% | 2818 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 50,082 psi | 77% | 2844 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 39,349 psi | 61% | 2674 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 96% | 47,427 psi | 73% | 2884 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 41,017 psi | 63% | 2707 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 32,953 psi | 51% | 2552 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,999 psi | 57% | 2667 fps | 97.8% |
| Hodgdon Superformance | <<locked>> | 98% | 51,619 psi | 79% | 2972 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,918 psi | 40% | 1598 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,624 psi | 61% | 2661 fps | 97.9% |
| IMR 3031 | <<locked>> | 80% | 40,364 psi | 62% | 2710 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,289 psi | 56% | 2572 fps | 96% |
| IMR 4166 Enduron | <<locked>> | 86% | 47,297 psi | 73% | 2762 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 50,502 psi | 78% | 2746 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 50,024 psi | 77% | 2841 fps | 95.7% |
| IMR 4831 | <<locked>> | 92% | 36,883 psi | 57% | 2661 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 37,333 psi | 57% | 2651 fps | 96.9% |
| IMR 8208 XBR | <<locked>> | 80% | 42,772 psi | 66% | 2710 fps | 99.1% |
| Lovex D073.5 | <<locked>> | 80% | 48,240 psi | 74% | 2799 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 39,305 psi | 60% | 2671 fps | 99.5% |
| Lovex S060 | <<locked>> | 80% | 41,191 psi | 63% | 2638 fps | 97.8% |
| Lovex S062 | <<locked>> | 80% | 35,969 psi | 55% | 2579 fps | 97.8% |
| Lovex S065 | <<locked>> | 92% | 43,047 psi | 66% | 2720 fps | 95.5% |
| Lovex S070 | <<locked>> | 96% | 46,267 psi | 71% | 2802 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 39,813 psi | 61% | 2648 fps | 98.6% |
| Norma 202 | <<locked>> | 80% | 40,176 psi | 62% | 2667 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 35,810 psi | 55% | 2605 fps | 96.4% |
| Norma URP | <<locked>> | 92% | 38,464 psi | 59% | 2707 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 35,418 psi | 54% | 2615 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 96% | 43,381 psi | 67% | 2812 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 42,743 psi | 66% | 2703 fps | 95.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,148 psi | 65% | 2730 fps | 98% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,398 psi | 71% | 2759 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,121 psi | 40% | 1637 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,211 psi | 74% | 2802 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 45,513 psi | 70% | 2769 fps | 95.4% |
| ReloadSwiss RS 52 | 50.1 gr | 80% | 37,927 psi | 58% | 2717 fps | 96.4% |
| ReloadSwiss RS 60 | 50.9 gr | 80% | 31,125 psi | 48% | 2572 fps | 97.4% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 38,014 psi | 58% | 2726 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 41,582 psi | 64% | 2802 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 43,453 psi | 67% | 2700 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 37,782 psi | 58% | 2598 fps | 98.2% |
| Rottweil R 903 | <<locked>> | 80% | 31,096 psi | 48% | 2490 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 96% | 51,053 psi | 79% | 2858 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 43,047 psi | 66% | 2720 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,305 psi | 60% | 2671 fps | 99.5% |
| Shooters World Precision | <<locked>> | 80% | 35,969 psi | 55% | 2579 fps | 97.8% |
| Shooters World SW4350 | <<locked>> | 96% | 46,267 psi | 71% | 2802 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 50,995 psi | 78% | 2818 fps | 99.7% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 54,157 psi | 83% | 2900 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 34,722 psi | 53% | 2605 fps | 95.8% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 50,995 psi | 78% | 2805 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 40,843 psi | 63% | 2674 fps | 95.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,291 psi | 60% | 2661 fps | 97.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,452 psi | 64% | 2615 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,185 psi | 53% | 2474 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 49,037 psi | 75% | 2779 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 46,122 psi | 71% | 2789 fps | 99.6% |
| Somchem S335 | <<locked>> | 80% | 40,988 psi | 63% | 2615 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 40,524 psi | 62% | 2674 fps | 97.6% |
| Somchem S355 | <<locked>> | 80% | 32,242 psi | 50% | 2507 fps | 95.6% |
| Somchem S365 | <<locked>> | 86% | 28,108 psi | 43% | 2477 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 47,021 psi | 72% | 2687 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,727 psi | 64% | 2615 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,028 psi | 57% | 2592 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,869 psi | 58% | 2595 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 30,560 psi | 47% | 2441 fps | 96.5% |
| Vihtavuori N160 | <<locked>> | 90% | 37,855 psi | 58% | 2657 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 42,917 psi | 66% | 2707 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 80% | 36,463 psi | 56% | 2582 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 92% | 39,653 psi | 61% | 2713 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 98% | 34,911 psi | 54% | 2680 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 31,256 psi | 48% | 2467 fps | 95% |
| Winchester 748 | <<locked>> | 80% | 42,134 psi | 65% | 2746 fps | 99.5% |
| Winchester 760 | <<locked>> | 96% | 47,427 psi | 73% | 2884 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,653 psi | 59% | 2664 fps | 97.8% |
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 105 powders for .300 Rem. SA Ultra Mag. loaded with the .308 | 155gr | Merlin Virtus. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,117 fps; across all powders the maximum-charge window runs from 1,785 fps to 3,117 fps. Accurate 4350 gives the best case fill at 100 %, and 105 of the 105 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 53–90 %, 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-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. Alliant Power Pro 2000-MR, ReloadSwiss RS 60, ReloadSwiss RS 52 rank at the top here: for .300 Rem. SA Ultra Mag. 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.