Load Specifications
Load data in caliber .300 RCM with .308 | 170gr | Geco PLUS bullet and 98 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.
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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>> | 84% | 56,463 psi | 88% | 2736 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,434 psi | 87% | 2762 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 57,000 psi | 89% | 2828 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,143 psi | 85% | 2759 fps | 97.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,177 psi | 66% | 2657 fps | 96.3% |
| Accurate 4064 | <<locked>> | 90% | 55,347 psi | 87% | 2812 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,158 psi | 86% | 2897 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 86% | 55,521 psi | 87% | 2841 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 56,623 psi | 89% | 2841 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,592 psi | 86% | 2792 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,637 psi | 87% | 2766 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,158 psi | 86% | 2959 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,623 psi | 89% | 2861 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,232 psi | 90% | 2887 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,202 psi | 88% | 2949 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,041 psi | 85% | 2936 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,364 psi | 63% | 2690 fps | 99.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,179 psi | 71% | 2851 fps | 98.5% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,376 psi | 87% | 2858 fps | 99.8% |
| Bofors RP3 | <<locked>> | 92% | 57,551 psi | 90% | 2881 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 57,217 psi | 90% | 2848 fps | 97.8% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,231 psi | 88% | 2772 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 57,595 psi | 90% | 2874 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,796 psi | 87% | 2917 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 54,592 psi | 86% | 2838 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 96% | 54,273 psi | 85% | 2890 fps | 98% |
| Hodgdon H4350 | <<locked>> | 94% | 54,868 psi | 86% | 2854 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 86% | 56,072 psi | 88% | 2851 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,504 psi | 82% | 2825 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,637 psi | 87% | 2884 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,737 psi | 86% | 2927 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,621 psi | 56% | 1726 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 57,377 psi | 90% | 2851 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 56,188 psi | 88% | 2831 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,144 psi | 88% | 2825 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,941 psi | 88% | 2805 fps | 98.1% |
| IMR 4350ᴾ | <<locked>> | 100% | 57,609 psi | 90% | 2877 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,738 psi | 87% | 2828 fps | 98% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,535 psi | 87% | 2884 fps | 99.8% |
| IMR 4895 | <<locked>> | 88% | 55,216 psi | 87% | 2864 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 54,592 psi | 86% | 2792 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,303 psi | 87% | 2815 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,100 psi | 86% | 2769 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 55,985 psi | 88% | 2822 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,042 psi | 86% | 2822 fps | 99% |
| Lovex S070 | <<locked>> | 98% | 56,028 psi | 88% | 2858 fps | 98.4% |
| Norma 201 | <<locked>> | 86% | 54,172 psi | 85% | 2785 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,723 psi | 86% | 2785 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,391 psi | 88% | 2871 fps | 100% |
| Norma 204 | <<locked>> | 98% | 54,752 psi | 86% | 2871 fps | 96.2% |
| Norma URP | <<locked>> | 98% | 54,070 psi | 85% | 2881 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 90% | 57,246 psi | 90% | 2900 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,594 psi | 89% | 2933 fps | 99% |
| Ramshot TAC | <<locked>> | 84% | 54,795 psi | 86% | 2812 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,230 psi | 85% | 2825 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,347 psi | 87% | 2792 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,100 psi | 57% | 1768 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 57,363 psi | 90% | 2818 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,056 psi | 86% | 2825 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,288 psi | 85% | 2900 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 57,537 psi | 90% | 2986 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,752 psi | 86% | 2917 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,404 psi | 85% | 2946 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 84% | 55,143 psi | 86% | 2762 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,882 psi | 86% | 2785 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 57,421 psi | 90% | 2871 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 57,217 psi | 90% | 2848 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,042 psi | 86% | 2822 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,303 psi | 87% | 2815 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,985 psi | 88% | 2822 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,028 psi | 88% | 2858 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,288 psi | 87% | 2877 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,898 psi | 89% | 2844 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 57,348 psi | 90% | 2861 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,724 psi | 87% | 2723 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,869 psi | 88% | 2720 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,535 psi | 87% | 2779 fps | 98% |
| Somchem S321 | <<locked>> | 82% | 55,709 psi | 87% | 2822 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,998 psi | 86% | 2720 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,507 psi | 89% | 2831 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 57,348 psi | 90% | 2864 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,083 psi | 82% | 2884 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,399 psi | 76% | 2762 fps | 96.2% |
| Vihtavuori N130 | <<locked>> | 82% | 55,317 psi | 87% | 2684 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,985 psi | 88% | 2707 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,665 psi | 86% | 2749 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,448 psi | 87% | 2766 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,535 psi | 87% | 2799 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,681 psi | 89% | 2877 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 84% | 54,853 psi | 86% | 2789 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,971 psi | 89% | 2808 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,622 psi | 87% | 2884 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,309 psi | 69% | 2766 fps | 99% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,869 psi | 89% | 2854 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,940 psi | 86% | 2838 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,563 psi | 86% | 2894 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,172 psi | 57% | 2697 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 88% | 57,392 psi | 90% | 2871 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% | 49,922 psi | 78% | 2644 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,699 psi | 67% | 2575 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,835 psi | 78% | 2726 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 47,514 psi | 74% | 2651 fps | 95.6% |
| Accurate 3100 | <<locked>> | 98% | 39,494 psi | 62% | 2605 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 40,364 psi | 63% | 2572 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 34,098 psi | 53% | 2503 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 46,108 psi | 72% | 2687 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 39,117 psi | 61% | 2536 fps | 97.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,138 psi | 75% | 2690 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 48,544 psi | 76% | 2671 fps | 100% |
| Alliant Power Pro 2000-MR | 53.1 gr | 80% | 41,858 psi | 66% | 2717 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,972 psi | 61% | 2562 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,742 psi | 65% | 2621 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 84% | 34,229 psi | 54% | 2516 fps | 95.7% |
| Alliant Reloder-17 | 52.3 gr | 80% | 33,562 psi | 53% | 2530 fps | 97.3% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,675 psi | 47% | 2421 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 94% | 36,564 psi | 57% | 2661 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,353 psi | 71% | 2690 fps | 98.7% |
| Bofors RP3 | <<locked>> | 80% | 38,566 psi | 60% | 2562 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 44,628 psi | 70% | 2638 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,690 psi | 78% | 2677 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,065 psi | 74% | 2713 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,170 psi | 82% | 2864 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 80% | 39,465 psi | 62% | 2569 fps | 96.8% |
| Hodgdon H414 | <<locked>> | 88% | 41,669 psi | 65% | 2664 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 90% | 48,385 psi | 76% | 2743 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 46,514 psi | 73% | 2697 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,414 psi | 46% | 2359 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,525 psi | 67% | 2667 fps | 99.6% |
| Hodgdon Superformance | 62.2 gr | 90% | 44,295 psi | 69% | 2740 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,542 psi | 42% | 1542 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,512 psi | 70% | 2644 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 46,311 psi | 73% | 2687 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,089 psi | 64% | 2569 fps | 98.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,613 psi | 68% | 2592 fps | 95.5% |
| IMR 4350 | <<locked>> | 92% | 44,788 psi | 70% | 2664 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,729 psi | 69% | 2621 fps | 95.4% |
| IMR 4831 | <<locked>> | 84% | 32,938 psi | 52% | 2461 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 42,786 psi | 67% | 2654 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 80% | 48,138 psi | 75% | 2690 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,353 psi | 71% | 2664 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,832 psi | 72% | 2618 fps | 99.4% |
| Lovex S062 | <<locked>> | 80% | 41,046 psi | 64% | 2572 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 38,174 psi | 60% | 2516 fps | 95.4% |
| Lovex S070 | <<locked>> | 88% | 41,191 psi | 65% | 2598 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 45,121 psi | 71% | 2638 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 45,513 psi | 71% | 2644 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,133 psi | 64% | 2612 fps | 98.8% |
| Norma 204 | <<locked>> | 96% | 51,169 psi | 80% | 2815 fps | 95.4% |
| Norma URP | <<locked>> | 84% | 34,330 psi | 54% | 2507 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 40,611 psi | 64% | 2621 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 90% | 40,640 psi | 64% | 2651 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 48,037 psi | 75% | 2700 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,630 psi | 75% | 2720 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,750 psi | 81% | 2740 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,847 psi | 42% | 1578 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,693 psi | 84% | 2766 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,755 psi | 62% | 2549 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,077 psi | 69% | 2726 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,694 psi | 56% | 2595 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 33,823 psi | 53% | 2520 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 36,158 psi | 57% | 2579 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 49,139 psi | 77% | 2674 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,989 psi | 67% | 2592 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 36,289 psi | 57% | 2507 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 88% | 44,628 psi | 70% | 2638 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,174 psi | 60% | 2516 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,353 psi | 71% | 2664 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,046 psi | 64% | 2572 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 88% | 41,191 psi | 65% | 2598 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,246 psi | 58% | 2556 fps | 97.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,383 psi | 73% | 2674 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,498 psi | 70% | 2654 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,441 psi | 73% | 2589 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,740 psi | 61% | 2457 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 42,801 psi | 67% | 2566 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 52,185 psi | 82% | 2769 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,992 psi | 72% | 2589 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,209 psi | 72% | 2674 fps | 99.4% |
| Somchem S355 | <<locked>> | 80% | 37,144 psi | 58% | 2513 fps | 98.3% |
| Somchem S365 | <<locked>> | 80% | 27,006 psi | 42% | 2346 fps | 96% |
| Somchem S385 | <<locked>> | 98% | 45,469 psi | 71% | 2713 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 52,301 psi | 82% | 2644 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,804 psi | 73% | 2579 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,583 psi | 67% | 2569 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,975 psi | 67% | 2579 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,230 psi | 55% | 2448 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 82% | 33,533 psi | 53% | 2451 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 48,196 psi | 76% | 2687 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,539 psi | 65% | 2569 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,288 psi | 55% | 2510 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 90% | 31,923 psi | 50% | 2497 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,299 psi | 49% | 2379 fps | 96.6% |
| Winchester 748 | <<locked>> | 80% | 48,051 psi | 75% | 2733 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 41,669 psi | 65% | 2664 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,747 psi | 47% | 2500 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,092 psi | 69% | 2661 fps | 99.5% |
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 117 powders for .300 RCM loaded with the .308 | 170gr | Geco PLUS. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,986 fps; across all powders the maximum-charge window runs from 1,726 fps to 2,986 fps. Accurate 3100 gives the best case fill at 100 %, and 117 of the 117 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 170.0 gr projectile in 0.308" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, ADI AR 2213 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 | 170gr | Geco PLUS they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2213, Alliant Reloder-22, Alliant Reloder-25 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.