Load Specifications
Bullet:.308 | 180gr | Speer RN
Bullet Manufacturer:Speer
Bullet Weight:180 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:1:16.0
Load data in caliber .300 RCM with .308 | 180gr | Speer RN 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 70, Hodgdon Superformance 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>> | 82% | 55,230 psi | 87% | 2641 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 54,259 psi | 85% | 2667 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 55,811 psi | 87% | 2733 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 56,405 psi | 88% | 2726 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 44,788 psi | 70% | 2638 fps | 97.7% |
| Accurate 4064 | <<locked>> | 88% | 54,607 psi | 86% | 2720 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 54,302 psi | 85% | 2808 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 54,447 psi | 85% | 2749 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 55,521 psi | 87% | 2753 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 52,489 psi | 82% | 2785 fps | 96.6% |
| ADI Benchmark 8208 | <<locked>> | 84% | 56,797 psi | 89% | 2746 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,317 psi | 85% | 2667 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 54,041 psi | 85% | 2864 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 52,141 psi | 82% | 2782 fps | 96.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,738 psi | 87% | 2772 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 56,304 psi | 88% | 2795 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 55,419 psi | 87% | 2864 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 56,898 psi | 89% | 2897 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 51,358 psi | 80% | 2772 fps | 96.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,554 psi | 67% | 2667 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 37,434 psi | 59% | 2569 fps | 96% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,877 psi | 75% | 2838 fps | 99.4% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 53,983 psi | 85% | 2762 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 56,420 psi | 88% | 2789 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 56,144 psi | 88% | 2762 fps | 98.2% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,708 psi | 86% | 2677 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 56,420 psi | 88% | 2776 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 57,116 psi | 90% | 2802 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 96% | 57,043 psi | 89% | 2861 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 94% | 57,377 psi | 90% | 2822 fps | 97.9% |
| Hodgdon H4895 | <<locked>> | 84% | 55,056 psi | 86% | 2759 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 55,361 psi | 87% | 2789 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 54,607 psi | 86% | 2789 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 57,551 psi | 90% | 2900 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,853 psi | 56% | 1683 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,970 psi | 88% | 2756 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 55,230 psi | 87% | 2736 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 54,810 psi | 86% | 2730 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 54,491 psi | 85% | 2713 fps | 98.4% |
| IMR 4350 | <<locked>> | 98% | 56,739 psi | 89% | 2792 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 92% | 54,723 psi | 86% | 2746 fps | 98.4% |
| IMR 4831 | <<locked>> | 98% | 54,926 psi | 86% | 2802 fps | 99.9% |
| IMR 4895 | <<locked>> | 88% | 57,711 psi | 90% | 2822 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 56,797 psi | 89% | 2746 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 54,462 psi | 85% | 2723 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 57,159 psi | 90% | 2723 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 55,013 psi | 86% | 2730 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 57,464 psi | 90% | 2785 fps | 99.6% |
| Lovex S070 | <<locked>> | 96% | 55,201 psi | 87% | 2776 fps | 98.7% |
| Norma 201 | <<locked>> | 86% | 56,434 psi | 88% | 2740 fps | 100% |
| Norma 202 | <<locked>> | 86% | 57,058 psi | 89% | 2740 fps | 100% |
| Norma 203B | <<locked>> | 88% | 55,521 psi | 87% | 2782 fps | 100% |
| Norma 204 | <<locked>> | 98% | 57,464 psi | 90% | 2844 fps | 97.4% |
| Norma MRPᴾ | <<locked>> | 100% | 47,471 psi | 74% | 2789 fps | 97.3% |
| Norma URP | <<locked>> | 98% | 56,869 psi | 89% | 2848 fps | 100% |
| Ramshot Big Game | <<locked>> | 88% | 55,927 psi | 88% | 2805 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 55,724 psi | 87% | 2848 fps | 99.3% |
| Ramshot TAC | <<locked>> | 84% | 57,014 psi | 89% | 2772 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 56,594 psi | 89% | 2785 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 57,522 psi | 90% | 2749 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,376 psi | 57% | 1722 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 57,464 psi | 90% | 2789 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 57,058 psi | 89% | 2861 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 56,579 psi | 89% | 2894 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 54,041 psi | 85% | 2831 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 57,174 psi | 90% | 2917 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 84% | 57,319 psi | 90% | 2717 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 57,174 psi | 90% | 2740 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 56,231 psi | 88% | 2779 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 50,386 psi | 79% | 2762 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 94% | 56,144 psi | 88% | 2762 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 96% | 57,464 psi | 90% | 2785 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 84% | 54,462 psi | 85% | 2723 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,013 psi | 86% | 2730 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 55,201 psi | 87% | 2776 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 54,302 psi | 85% | 2789 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,608 psi | 87% | 2749 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 56,391 psi | 88% | 2772 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,404 psi | 85% | 2631 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 54,955 psi | 86% | 2635 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 54,157 psi | 85% | 2690 fps | 98.4% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 49,908 psi | 78% | 2756 fps | 96.4% |
| Somchem S335 | <<locked>> | 86% | 57,145 psi | 90% | 2671 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 55,027 psi | 86% | 2736 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 56,449 psi | 88% | 2776 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 55,216 psi | 87% | 2848 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 51,024 psi | 80% | 2740 fps | 97.4% |
| Vihtavuori N130 | <<locked>> | 82% | 57,348 psi | 90% | 2631 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 54,766 psi | 86% | 2615 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 57,145 psi | 90% | 2700 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 54,186 psi | 85% | 2671 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 54,331 psi | 85% | 2707 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 55,637 psi | 87% | 2789 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 84% | 57,130 psi | 90% | 2743 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 55,695 psi | 87% | 2717 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 54,679 psi | 86% | 2795 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 47,094 psi | 74% | 2740 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 55,738 psi | 87% | 2769 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 57,493 psi | 90% | 2792 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 57,363 psi | 90% | 2864 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,174 psi | 60% | 2694 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 86% | 56,202 psi | 88% | 2776 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% | 51,967 psi | 81% | 2598 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,846 psi | 70% | 2533 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 52,185 psi | 82% | 2684 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 43,468 psi | 68% | 2513 fps | 95.3% |
| Accurate 3100 | <<locked>> | 94% | 36,593 psi | 57% | 2480 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 42,409 psi | 66% | 2536 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 31,459 psi | 49% | 2375 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 48,066 psi | 75% | 2648 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 40,785 psi | 64% | 2503 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 98% | 49,313 psi | 77% | 2733 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,125 psi | 79% | 2648 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,894 psi | 80% | 2621 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,888 psi | 69% | 2690 fps | 99.2% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 45,832 psi | 72% | 2674 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,814 psi | 64% | 2526 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,671 psi | 68% | 2589 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,647 psi | 50% | 2388 fps | 95.5% |
| Alliant Reloder-17 | 52.3 gr | 80% | 35,230 psi | 55% | 2507 fps | 98.5% |
| Alliant Reloder-19 | <<locked>> | 98% | 48,327 psi | 76% | 2723 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 86% | 27,514 psi | 43% | 2300 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 98% | 35,259 psi | 55% | 2513 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 90% | 33,634 psi | 53% | 2526 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,427 psi | 74% | 2657 fps | 99.4% |
| Bofors RP3 | <<locked>> | 80% | 40,538 psi | 64% | 2533 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 41,205 psi | 65% | 2507 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,561 psi | 81% | 2631 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,255 psi | 77% | 2674 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,336 psi | 65% | 2539 fps | 97.9% |
| Hodgdon H414 | <<locked>> | 86% | 41,002 psi | 64% | 2585 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 86% | 44,585 psi | 70% | 2608 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 48,530 psi | 76% | 2657 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,008 psi | 45% | 2290 fps | 96.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,657 psi | 70% | 2635 fps | 99.9% |
| Hodgdon Superformance | 60.8 gr | 88% | 43,308 psi | 68% | 2654 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,731 psi | 42% | 1503 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,398 psi | 73% | 2608 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 48,559 psi | 76% | 2644 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,859 psi | 67% | 2536 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,324 psi | 71% | 2559 fps | 96.7% |
| IMR 4350 | <<locked>> | 88% | 41,568 psi | 65% | 2536 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 82% | 40,176 psi | 63% | 2487 fps | 95.2% |
| IMR 4831 | <<locked>> | 80% | 30,443 psi | 48% | 2333 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 44,773 psi | 70% | 2618 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 50,125 psi | 79% | 2648 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,572 psi | 75% | 2625 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,572 psi | 75% | 2579 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 42,873 psi | 67% | 2536 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 35,317 psi | 55% | 2388 fps | 95.2% |
| Lovex S070 | <<locked>> | 86% | 40,393 psi | 63% | 2516 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 47,036 psi | 74% | 2598 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,500 psi | 74% | 2602 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,047 psi | 67% | 2579 fps | 99.4% |
| Norma 204 | <<locked>> | 92% | 46,876 psi | 73% | 2674 fps | 95.1% |
| Norma MRP | <<locked>> | 96% | 41,481 psi | 65% | 2671 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 31,647 psi | 50% | 2375 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 42,670 psi | 67% | 2592 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 37,652 psi | 59% | 2523 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 50,009 psi | 78% | 2664 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,748 psi | 78% | 2680 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,795 psi | 84% | 2697 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,079 psi | 42% | 1535 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,539 psi | 65% | 2520 fps | 96.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,398 psi | 73% | 2694 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,463 psi | 59% | 2569 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 33,417 psi | 52% | 2444 fps | 95.8% |
| ReloadSwiss RS 70 | 55.8 gr | 84% | 35,520 psi | 56% | 2503 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 51,111 psi | 80% | 2628 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,817 psi | 70% | 2552 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 38,145 psi | 60% | 2477 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 98% | 46,978 psi | 74% | 2703 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 84% | 41,205 psi | 65% | 2507 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,317 psi | 55% | 2388 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,572 psi | 75% | 2625 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,873 psi | 67% | 2536 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 40,393 psi | 63% | 2516 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,146 psi | 61% | 2530 fps | 98.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,486 psi | 76% | 2641 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,441 psi | 73% | 2618 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,240 psi | 76% | 2543 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,393 psi | 63% | 2418 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 39,349 psi | 62% | 2434 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 46,543 psi | 73% | 2697 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 47,819 psi | 75% | 2543 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,312 psi | 76% | 2635 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 38,899 psi | 61% | 2484 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 28,442 psi | 45% | 2329 fps | 97.6% |
| Somchem S385 | <<locked>> | 94% | 41,887 psi | 66% | 2579 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 54,244 psi | 85% | 2592 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 48,660 psi | 76% | 2533 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,599 psi | 70% | 2526 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,875 psi | 70% | 2536 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,941 psi | 58% | 2418 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 33,083 psi | 52% | 2379 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 50,241 psi | 79% | 2644 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,395 psi | 68% | 2533 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 32,634 psi | 51% | 2379 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 86% | 29,820 psi | 47% | 2375 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,735 psi | 51% | 2356 fps | 97.9% |
| Winchester 748 | <<locked>> | 80% | 50,314 psi | 79% | 2694 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 41,234 psi | 65% | 2589 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 90% | 27,572 psi | 43% | 2375 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,151 psi | 72% | 2625 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 RCM loaded with the .308 | 180gr | Speer RN. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,917 fps; across all powders the maximum-charge window runs from 1,683 fps to 2,917 fps. Accurate 3100 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 56–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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 70, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .300 RCM with the .308 | 180gr | Speer RN 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.