Load Specifications
Load data in caliber .300 RCM with .308 | 165gr | Woodleigh PP SN bullet and 99 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, 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>> | 84% | 55,622 psi | 87% | 2769 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 57,609 psi | 90% | 2844 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,389 psi | 85% | 2792 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,941 psi | 88% | 2858 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 57,058 psi | 89% | 2844 fps | 97.3% |
| Accurate 4064 | <<locked>> | 92% | 57,740 psi | 90% | 2884 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 53,896 psi | 84% | 2917 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 86% | 54,621 psi | 86% | 2867 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 55,680 psi | 87% | 2867 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,043 psi | 89% | 2871 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,360 psi | 85% | 2795 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,317 psi | 85% | 2989 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,564 psi | 87% | 2887 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,188 psi | 88% | 2913 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,042 psi | 86% | 2976 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 96% | 56,536 psi | 89% | 3015 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,450 psi | 62% | 2707 fps | 98.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,208 psi | 69% | 2871 fps | 98% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,331 psi | 85% | 2881 fps | 99.6% |
| Bofors RP3 | <<locked>> | 92% | 56,362 psi | 88% | 2907 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,463 psi | 88% | 2877 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,463 psi | 87% | 2805 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,536 psi | 89% | 2900 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,737 psi | 86% | 2946 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 57,638 psi | 90% | 2858 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 57,319 psi | 90% | 2920 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 98% | 56,826 psi | 89% | 2969 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 96% | 57,464 psi | 90% | 2930 fps | 97% |
| Hodgdon H4895 | <<locked>> | 86% | 55,143 psi | 86% | 2881 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,343 psi | 80% | 2848 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,520 psi | 85% | 2910 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 53,766 psi | 84% | 2949 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,476 psi | 56% | 1752 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,478 psi | 89% | 2884 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,216 psi | 87% | 2861 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,274 psi | 87% | 2854 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,100 psi | 86% | 2831 fps | 97.7% |
| IMR 4350ᴾ | <<locked>> | 100% | 56,463 psi | 88% | 2900 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,781 psi | 86% | 2854 fps | 97.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,563 psi | 86% | 2910 fps | 99.6% |
| IMR 4895 | <<locked>> | 90% | 57,638 psi | 90% | 2943 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 57,043 psi | 89% | 2871 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 57,319 psi | 90% | 2854 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,244 psi | 85% | 2844 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 57,624 psi | 90% | 2848 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 55,027 psi | 86% | 2848 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 57,638 psi | 90% | 2900 fps | 99.1% |
| Lovex S070 | <<locked>> | 98% | 55,172 psi | 86% | 2884 fps | 98% |
| Norma 201 | <<locked>> | 88% | 56,927 psi | 89% | 2864 fps | 100% |
| Norma 202 | <<locked>> | 88% | 57,479 psi | 90% | 2864 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,390 psi | 87% | 2900 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 57,377 psi | 90% | 2953 fps | 96.4% |
| Norma URPᴾ | <<locked>> | 100% | 56,594 psi | 89% | 2959 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 90% | 56,115 psi | 88% | 2927 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,274 psi | 87% | 2953 fps | 98.6% |
| Ramshot TAC | <<locked>> | 86% | 57,377 psi | 90% | 2890 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 86% | 57,130 psi | 90% | 2910 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,491 psi | 85% | 2822 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,940 psi | 56% | 1795 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,449 psi | 88% | 2848 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 57,667 psi | 90% | 2904 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 56,985 psi | 89% | 2986 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,304 psi | 88% | 3015 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 57,566 psi | 90% | 2999 fps | 99.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 57,174 psi | 90% | 3028 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 86% | 57,711 psi | 90% | 2841 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 57,334 psi | 90% | 2861 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,231 psi | 88% | 2897 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,463 psi | 88% | 2877 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 98% | 57,638 psi | 90% | 2900 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,244 psi | 85% | 2844 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,027 psi | 86% | 2848 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,172 psi | 86% | 2884 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,215 psi | 85% | 2907 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,840 psi | 88% | 2867 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,637 psi | 89% | 2894 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,955 psi | 86% | 2756 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,984 psi | 86% | 2753 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,491 psi | 85% | 2802 fps | 97.6% |
| Somchem S321 | <<locked>> | 82% | 54,766 psi | 86% | 2851 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,201 psi | 85% | 2753 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,448 psi | 87% | 2858 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 56,304 psi | 88% | 2894 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,821 psi | 80% | 2907 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 54,578 psi | 86% | 2717 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,201 psi | 87% | 2740 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 56,942 psi | 89% | 2822 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,520 psi | 85% | 2795 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,491 psi | 85% | 2825 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,492 psi | 87% | 2900 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 86% | 57,667 psi | 90% | 2871 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,941 psi | 88% | 2838 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 54,708 psi | 86% | 2910 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,439 psi | 68% | 2789 fps | 98.7% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,912 psi | 88% | 2881 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 57,653 psi | 90% | 2917 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 57,058 psi | 89% | 2976 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,331 psi | 55% | 2707 fps | 98.5% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,594 psi | 89% | 2904 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% | 49,182 psi | 77% | 2677 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 53,940 psi | 85% | 2792 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,916 psi | 66% | 2605 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,950 psi | 77% | 2753 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 46,717 psi | 73% | 2674 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 39,639 psi | 62% | 2598 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,344 psi | 52% | 2523 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 45,150 psi | 71% | 2707 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 80% | 38,508 psi | 60% | 2559 fps | 97.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,181 psi | 74% | 2713 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 47,732 psi | 75% | 2703 fps | 100% |
| Alliant Power Pro 2000-MR | 53.4 gr | 80% | 41,104 psi | 64% | 2736 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,087 psi | 60% | 2579 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,814 psi | 64% | 2641 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,605 psi | 53% | 2533 fps | 95% |
| Alliant Reloder-17 | 52.6 gr | 80% | 32,938 psi | 52% | 2546 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,850 psi | 48% | 2490 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,708 psi | 56% | 2671 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,541 psi | 70% | 2713 fps | 98.3% |
| Bofors RP3 | <<locked>> | 80% | 37,840 psi | 59% | 2585 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 46,847 psi | 73% | 2713 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,023 psi | 77% | 2707 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,224 psi | 72% | 2740 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,184 psi | 80% | 2890 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 80% | 54,128 psi | 85% | 2812 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,566 psi | 60% | 2585 fps | 96.2% |
| Hodgdon H414 | <<locked>> | 90% | 43,685 psi | 68% | 2743 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 92% | 50,676 psi | 79% | 2822 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 45,542 psi | 71% | 2720 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,906 psi | 45% | 2379 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,727 psi | 65% | 2694 fps | 99.3% |
| Hodgdon Superformance | 63.9 gr | 92% | 46,572 psi | 73% | 2818 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,469 psi | 41% | 1568 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,816 psi | 69% | 2674 fps | 99.3% |
| IMR 3031 | <<locked>> | 80% | 45,484 psi | 71% | 2717 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,437 psi | 63% | 2592 fps | 98% |
| IMR 4166 Enduron | <<locked>> | 82% | 45,658 psi | 72% | 2667 fps | 95.7% |
| IMR 4350 | <<locked>> | 94% | 46,920 psi | 74% | 2740 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 45,658 psi | 72% | 2697 fps | 95.6% |
| IMR 4831 | <<locked>> | 86% | 34,563 psi | 54% | 2536 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 41,829 psi | 66% | 2674 fps | 98.7% |
| IMR 8208 XBR | <<locked>> | 80% | 47,181 psi | 74% | 2713 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 53,708 psi | 84% | 2802 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,541 psi | 70% | 2690 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,223 psi | 71% | 2648 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 40,364 psi | 63% | 2598 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 39,856 psi | 62% | 2585 fps | 95.6% |
| Lovex S070 | <<locked>> | 90% | 42,975 psi | 67% | 2671 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 44,440 psi | 70% | 2664 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 44,585 psi | 70% | 2667 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,234 psi | 63% | 2631 fps | 98.4% |
| Norma 204 | <<locked>> | 98% | 53,606 psi | 84% | 2894 fps | 95.6% |
| Norma URP | <<locked>> | 86% | 35,839 psi | 56% | 2575 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 39,827 psi | 62% | 2644 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 90% | 40,016 psi | 63% | 2674 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 47,268 psi | 74% | 2723 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,833 psi | 73% | 2746 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,966 psi | 80% | 2766 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,760 psi | 42% | 1604 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,910 psi | 83% | 2799 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,727 psi | 65% | 2628 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,207 psi | 68% | 2749 fps | 98.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,041 psi | 55% | 2615 fps | 99.4% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 35,375 psi | 55% | 2592 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 38,043 psi | 60% | 2661 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 48,196 psi | 76% | 2700 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,105 psi | 66% | 2612 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 35,592 psi | 56% | 2530 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 90% | 46,847 psi | 73% | 2713 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 86% | 39,856 psi | 62% | 2585 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,541 psi | 70% | 2690 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,364 psi | 63% | 2598 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 42,975 psi | 67% | 2671 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,535 psi | 57% | 2579 fps | 97.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,571 psi | 71% | 2700 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,743 psi | 69% | 2677 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,585 psi | 71% | 2615 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,971 psi | 60% | 2480 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 44,715 psi | 70% | 2638 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 51,329 psi | 80% | 2799 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,339 psi | 71% | 2618 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,339 psi | 71% | 2697 fps | 99.2% |
| Somchem S355 | <<locked>> | 80% | 36,521 psi | 57% | 2536 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 26,469 psi | 41% | 2359 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 51,387 psi | 81% | 2674 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,934 psi | 72% | 2605 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,640 psi | 65% | 2595 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,264 psi | 66% | 2605 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,592 psi | 54% | 2470 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 35,215 psi | 55% | 2530 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 47,471 psi | 74% | 2713 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 40,654 psi | 64% | 2592 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,548 psi | 54% | 2526 fps | 95% |
| Vihtavuori N555 | <<locked>> | 92% | 33,170 psi | 52% | 2562 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,763 psi | 48% | 2395 fps | 96% |
| Winchester 748 | <<locked>> | 80% | 47,195 psi | 74% | 2759 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 43,685 psi | 68% | 2743 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 96% | 31,009 psi | 49% | 2569 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,279 psi | 68% | 2684 fps | 99.3% |
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 99 powders for .300 RCM loaded with the .308 | 165gr | Woodleigh PP SN. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,028 fps; across all powders the maximum-charge window runs from 1,752 fps to 3,028 fps. Alliant Reloder-16 gives the best case fill at 100 %, and 99 of the 99 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-16, Alliant Reloder-23, Alliant Reloder-26 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .300 RCM with the .308 | 165gr | Woodleigh PP SN 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.