Load Specifications
Bullet Manufacturer:Swift
Bullet Weight:165 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:1:11.5
Load data in caliber .300 RCM with .308 | 165gr | Swift Scirocco bullet and 105 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 Power Pro 2000-MR 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% | 55,158 psi | 86% | 2740 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 57,305 psi | 90% | 2815 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 57,188 psi | 90% | 2808 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,695 psi | 87% | 2828 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 56,913 psi | 89% | 2805 fps | 96.7% |
| Accurate 4064 | <<locked>> | 94% | 56,811 psi | 89% | 2851 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,649 psi | 83% | 2874 fps | 99.1% |
| Accurate LT-30 | <<locked>> | 82% | 57,392 psi | 90% | 2723 fps | 100% |
| ADI AR 2206H | <<locked>> | 88% | 54,331 psi | 85% | 2838 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 94% | 55,288 psi | 87% | 2835 fps | 99.6% |
| ADI Benchmark 8208 | <<locked>> | 88% | 56,927 psi | 89% | 2841 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 57,377 psi | 90% | 2812 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,158 psi | 86% | 2894 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 57,421 psi | 90% | 3005 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 54,984 psi | 86% | 2854 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 54,955 psi | 86% | 2743 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 55,622 psi | 87% | 2874 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,111 psi | 80% | 2877 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 98% | 55,579 psi | 87% | 2972 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,230 psi | 57% | 2605 fps | 97.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,263 psi | 63% | 2753 fps | 96.1% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 56,724 psi | 89% | 2723 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,027 psi | 85% | 2848 fps | 99.3% |
| Bofors RP3 | <<locked>> | 94% | 55,564 psi | 87% | 2871 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 55,999 psi | 88% | 2835 fps | 96.8% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,434 psi | 87% | 2776 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 56,028 psi | 88% | 2871 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,404 psi | 85% | 2913 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 84% | 57,624 psi | 90% | 2835 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,129 psi | 86% | 2812 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 56,826 psi | 89% | 2884 fps | 99.2% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 55,825 psi | 87% | 2927 fps | 97.5% |
| Hodgdon H4350 | <<locked>> | 98% | 56,739 psi | 89% | 2887 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 88% | 54,853 psi | 86% | 2848 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,224 psi | 74% | 2756 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 57,537 psi | 90% | 2930 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 57,101 psi | 89% | 2963 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,099 psi | 55% | 1716 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,202 psi | 88% | 2851 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 54,636 psi | 86% | 2831 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 54,897 psi | 86% | 2818 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,158 psi | 86% | 2799 fps | 97.2% |
| IMR 4198 | <<locked>> | 82% | 55,143 psi | 86% | 2703 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,533 psi | 82% | 2805 fps | 96.2% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,520 psi | 85% | 2818 fps | 97% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,893 psi | 78% | 2815 fps | 98.8% |
| IMR 4895 | <<locked>> | 92% | 57,014 psi | 89% | 2907 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 88% | 56,927 psi | 89% | 2841 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 57,174 psi | 90% | 2825 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 57,609 psi | 90% | 2864 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 57,406 psi | 90% | 2812 fps | 99.9% |
| Lovex S062 | <<locked>> | 92% | 54,505 psi | 85% | 2815 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 56,855 psi | 89% | 2858 fps | 98.6% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,462 psi | 85% | 2841 fps | 97.4% |
| Norma 201 | <<locked>> | 90% | 56,420 psi | 88% | 2831 fps | 100% |
| Norma 202 | <<locked>> | 90% | 56,927 psi | 89% | 2835 fps | 100% |
| Norma 203B | <<locked>> | 92% | 54,781 psi | 86% | 2861 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 52,011 psi | 82% | 2864 fps | 99% |
| Ramshot Big Game | <<locked>> | 92% | 55,288 psi | 87% | 2890 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,937 psi | 80% | 2854 fps | 97.4% |
| Ramshot TAC | <<locked>> | 88% | 57,363 psi | 90% | 2858 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 88% | 56,739 psi | 89% | 2874 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,578 psi | 86% | 2792 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,549 psi | 56% | 1755 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 56,376 psi | 88% | 2822 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 57,217 psi | 90% | 2864 fps | 98.1% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 56,130 psi | 88% | 2946 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,477 psi | 87% | 2976 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,301 psi | 82% | 2897 fps | 98.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,547 psi | 82% | 2920 fps | 98.6% |
| Rottweil R 901 | <<locked>> | 88% | 57,377 psi | 90% | 2812 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 56,855 psi | 89% | 2828 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,143 psi | 86% | 2858 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 55,999 psi | 88% | 2835 fps | 96.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 56,855 psi | 89% | 2858 fps | 98.6% |
| Shooters World Match Rifle | <<locked>> | 90% | 57,609 psi | 90% | 2864 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,505 psi | 85% | 2815 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,462 psi | 85% | 2841 fps | 97.4% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 56,115 psi | 88% | 2792 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 57,246 psi | 90% | 2923 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 55,854 psi | 88% | 2766 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 55,608 psi | 87% | 2835 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 56,289 psi | 88% | 2861 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 54,839 psi | 86% | 2726 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 54,737 psi | 86% | 2723 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 57,667 psi | 90% | 2812 fps | 97.6% |
| Somchem S321 | <<locked>> | 84% | 54,621 psi | 86% | 2822 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 57,406 psi | 90% | 2769 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,158 psi | 86% | 2825 fps | 99.8% |
| Somchem S355 | <<locked>> | 96% | 55,535 psi | 87% | 2854 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,441 psi | 73% | 2815 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 54,665 psi | 86% | 2694 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 54,969 psi | 86% | 2713 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 56,347 psi | 88% | 2792 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 57,348 psi | 90% | 2808 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 57,290 psi | 90% | 2838 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 54,650 psi | 86% | 2861 fps | 99.2% |
| Vihtavuori N530 | <<locked>> | 88% | 57,696 psi | 90% | 2841 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 55,651 psi | 87% | 2808 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,664 psi | 84% | 2867 fps | 99% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,957 psi | 61% | 2680 fps | 97.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,303 psi | 87% | 2844 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 57,290 psi | 90% | 2887 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 56,144 psi | 88% | 2930 fps | 97.6% |
| Winchester StaBALL Match | <<locked>> | 90% | 55,999 psi | 88% | 2867 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% | 45,948 psi | 72% | 2605 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,256 psi | 79% | 2717 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,537 psi | 60% | 2526 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,382 psi | 71% | 2674 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 49,806 psi | 78% | 2694 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 36,419 psi | 57% | 2516 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 34,693 psi | 54% | 2536 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 54,085 psi | 85% | 2680 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 42,163 psi | 66% | 2625 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 80% | 36,042 psi | 56% | 2477 fps | 96% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,222 psi | 69% | 2635 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 44,135 psi | 69% | 2631 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 51,590 psi | 81% | 2838 fps | 99.8% |
| Alliant Power Pro 2000-MR | 49.7 gr | 80% | 38,261 psi | 60% | 2644 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,418 psi | 56% | 2500 fps | 97.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,706 psi | 81% | 2700 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,971 psi | 60% | 2556 fps | 96.9% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,389 psi | 55% | 2552 fps | 95.1% |
| Alliant Reloder-17 | 50.1 gr | 82% | 32,518 psi | 51% | 2507 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 96% | 32,097 psi | 50% | 2497 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 37,463 psi | 59% | 2684 fps | 95% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 53,417 psi | 84% | 2677 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,350 psi | 65% | 2625 fps | 97.2% |
| Bofors RP3 | <<locked>> | 80% | 34,780 psi | 55% | 2497 fps | 97.5% |
| Bofors RP7 | <<locked>> | 94% | 49,414 psi | 77% | 2730 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,093 psi | 72% | 2628 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,902 psi | 67% | 2657 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,021 psi | 74% | 2792 fps | 98.8% |
| Hodgdon H322 | <<locked>> | 80% | 50,676 psi | 79% | 2736 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,416 psi | 81% | 2759 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 38,189 psi | 60% | 2552 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 94% | 45,701 psi | 72% | 2756 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 96% | 53,461 psi | 84% | 2835 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 42,540 psi | 67% | 2638 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 30,371 psi | 48% | 2395 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,421 psi | 60% | 2602 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 96% | 49,414 psi | 77% | 2838 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,136 psi | 41% | 1532 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,973 psi | 64% | 2592 fps | 98.5% |
| IMR 3031 | <<locked>> | 80% | 42,076 psi | 66% | 2638 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,797 psi | 59% | 2510 fps | 96.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 45,571 psi | 71% | 2635 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 51,880 psi | 81% | 2657 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 49,269 psi | 77% | 2749 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 92% | 48,283 psi | 76% | 2713 fps | 95.7% |
| IMR 4831 | <<locked>> | 90% | 35,926 psi | 56% | 2549 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 38,885 psi | 61% | 2589 fps | 97.7% |
| IMR 8208 XBR | <<locked>> | 80% | 44,222 psi | 69% | 2635 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 80% | 49,937 psi | 78% | 2723 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,220 psi | 65% | 2608 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 42,612 psi | 67% | 2569 fps | 98.5% |
| Lovex S062 | <<locked>> | 80% | 37,637 psi | 59% | 2516 fps | 98.5% |
| Lovex S065 | <<locked>> | 90% | 41,916 psi | 66% | 2605 fps | 95.7% |
| Lovex S070 | <<locked>> | 94% | 45,049 psi | 71% | 2684 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 41,408 psi | 65% | 2582 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 41,684 psi | 65% | 2595 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,362 psi | 59% | 2546 fps | 97.3% |
| Norma URP | <<locked>> | 90% | 37,608 psi | 59% | 2595 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 36,912 psi | 58% | 2559 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 94% | 41,974 psi | 66% | 2687 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 44,208 psi | 69% | 2638 fps | 96.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,482 psi | 68% | 2657 fps | 98.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,906 psi | 75% | 2687 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,440 psi | 41% | 1568 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,530 psi | 78% | 2720 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 44,092 psi | 69% | 2644 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,697 psi | 62% | 2657 fps | 97.3% |
| ReloadSwiss RS 60 | 48.9 gr | 80% | 32,430 psi | 51% | 2520 fps | 98.4% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 37,072 psi | 58% | 2612 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 40,045 psi | 63% | 2674 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 45,339 psi | 71% | 2628 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,523 psi | 62% | 2536 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 80% | 32,750 psi | 51% | 2441 fps | 96.6% |
| Rottweil R 907 | <<locked>> | 94% | 49,414 psi | 77% | 2730 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 41,916 psi | 66% | 2605 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,220 psi | 65% | 2608 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 37,637 psi | 59% | 2516 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 94% | 45,049 psi | 71% | 2684 fps | 95.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,518 psi | 82% | 2740 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,852 psi | 53% | 2490 fps | 95.9% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,518 psi | 82% | 2720 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,322 psi | 66% | 2608 fps | 96.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,857 psi | 64% | 2595 fps | 98.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,902 psi | 67% | 2543 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,505 psi | 56% | 2408 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 47,340 psi | 74% | 2657 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 47,805 psi | 75% | 2717 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 42,409 psi | 66% | 2543 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,119 psi | 66% | 2612 fps | 98.3% |
| Somchem S355 | <<locked>> | 80% | 33,736 psi | 53% | 2451 fps | 96.6% |
| Somchem S365 | <<locked>> | 84% | 27,717 psi | 43% | 2379 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 48,457 psi | 76% | 2605 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,134 psi | 68% | 2536 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,667 psi | 61% | 2523 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,334 psi | 62% | 2530 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,995 psi | 50% | 2388 fps | 97.5% |
| Vihtavuori N160 | <<locked>> | 88% | 36,912 psi | 58% | 2543 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 44,208 psi | 69% | 2631 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 37,782 psi | 59% | 2516 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 88% | 36,201 psi | 57% | 2546 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 96% | 34,389 psi | 54% | 2575 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,443 psi | 48% | 2359 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 43,685 psi | 68% | 2677 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 45,977 psi | 72% | 2759 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,161 psi | 63% | 2598 fps | 98.5% |
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 115 powders for .300 RCM loaded with the .308 | 165gr | Swift Scirocco. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,005 fps; across all powders the maximum-charge window runs from 1,716 fps to 3,005 fps. Accurate 3100 gives the best case fill at 100 %, and 115 of the 115 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, ADI AR 2209 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 Power Pro 2000-MR, Alliant Reloder-17 rank at the top here: for .300 RCM with the .308 | 165gr | Swift Scirocco they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.