Load Specifications
Load data in caliber .300 RCM with .308 | 170gr | Geco SOFTPOINT bullet and 99 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Superformance, 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.
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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% | 56,898 psi | 89% | 2743 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,840 psi | 88% | 2769 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 57,363 psi | 90% | 2835 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,708 psi | 86% | 2772 fps | 97.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,743 psi | 67% | 2671 fps | 96.6% |
| Accurate 4064 | <<locked>> | 90% | 55,767 psi | 87% | 2818 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,825 psi | 87% | 2907 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 55,883 psi | 88% | 2848 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 56,956 psi | 89% | 2848 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,969 psi | 86% | 2802 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,811 psi | 87% | 2769 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,738 psi | 87% | 2969 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,927 psi | 89% | 2867 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,551 psi | 90% | 2890 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,753 psi | 89% | 2963 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,288 psi | 85% | 2940 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,611 psi | 64% | 2700 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,600 psi | 71% | 2864 fps | 98.7% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,709 psi | 87% | 2864 fps | 99.8% |
| Bofors RP3 | <<locked>> | 90% | 54,128 psi | 85% | 2835 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,143 psi | 85% | 2805 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,608 psi | 89% | 2782 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,302 psi | 85% | 2828 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,202 psi | 88% | 2927 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,259 psi | 87% | 2851 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 96% | 54,882 psi | 86% | 2904 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 94% | 55,419 psi | 87% | 2864 fps | 97% |
| Hodgdon H4895 | <<locked>> | 86% | 56,478 psi | 89% | 2858 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,127 psi | 83% | 2838 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,999 psi | 88% | 2890 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,201 psi | 87% | 2936 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,737 psi | 56% | 1732 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,099 psi | 85% | 2808 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 56,666 psi | 89% | 2838 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,550 psi | 89% | 2835 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,289 psi | 88% | 2815 fps | 98.2% |
| IMR 4350 | <<locked>> | 98% | 54,520 psi | 85% | 2831 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,014 psi | 88% | 2838 fps | 98.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 56,086 psi | 88% | 2897 fps | 99.8% |
| IMR 4895 | <<locked>> | 88% | 55,637 psi | 87% | 2874 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 54,969 psi | 86% | 2802 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,956 psi | 88% | 2825 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,172 psi | 86% | 2772 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,333 psi | 88% | 2828 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,579 psi | 87% | 2835 fps | 99.1% |
| Lovex S070 | <<locked>> | 98% | 56,608 psi | 89% | 2871 fps | 98.5% |
| Norma 201 | <<locked>> | 86% | 54,563 psi | 86% | 2792 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,114 psi | 86% | 2792 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,782 psi | 89% | 2881 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,303 psi | 87% | 2884 fps | 96.4% |
| Norma MRPᴾ | <<locked>> | 100% | 45,411 psi | 71% | 2818 fps | 96% |
| Norma URP | <<locked>> | 98% | 54,650 psi | 86% | 2894 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 90% | 57,566 psi | 90% | 2907 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 57,145 psi | 90% | 2946 fps | 99.1% |
| Ramshot TAC | <<locked>> | 84% | 55,100 psi | 86% | 2818 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,853 psi | 86% | 2838 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,666 psi | 87% | 2799 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,230 psi | 57% | 1772 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 57,696 psi | 90% | 2825 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,376 psi | 87% | 2831 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,708 psi | 86% | 2907 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,070 psi | 85% | 2943 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,347 psi | 87% | 2927 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,911 psi | 86% | 2956 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 84% | 55,608 psi | 87% | 2772 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,259 psi | 87% | 2792 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,230 psi | 85% | 2831 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 54,143 psi | 85% | 2805 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,579 psi | 87% | 2835 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,956 psi | 88% | 2825 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,333 psi | 88% | 2828 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,608 psi | 89% | 2871 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,912 psi | 88% | 2890 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 57,203 psi | 90% | 2851 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,389 psi | 85% | 2822 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,144 psi | 88% | 2733 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,260 psi | 88% | 2726 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,753 psi | 87% | 2785 fps | 98.1% |
| Somchem S321 | <<locked>> | 82% | 56,043 psi | 88% | 2828 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,376 psi | 87% | 2726 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,811 psi | 89% | 2841 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 54,360 psi | 85% | 2825 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,707 psi | 83% | 2894 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,863 psi | 77% | 2776 fps | 96.4% |
| Vihtavuori N130 | <<locked>> | 82% | 55,724 psi | 87% | 2690 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,405 psi | 88% | 2717 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,100 psi | 86% | 2756 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,869 psi | 88% | 2776 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,840 psi | 88% | 2805 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 57,290 psi | 90% | 2890 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 55,230 psi | 87% | 2799 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 57,537 psi | 90% | 2818 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,144 psi | 88% | 2894 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,889 psi | 70% | 2776 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 57,348 psi | 90% | 2864 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,347 psi | 87% | 2844 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,882 psi | 86% | 2904 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,550 psi | 57% | 2710 fps | 99.3% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,099 psi | 85% | 2825 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% | 50,314 psi | 79% | 2654 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,120 psi | 68% | 2585 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,227 psi | 79% | 2733 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 44,831 psi | 70% | 2605 fps | 95% |
| Accurate 3100 | <<locked>> | 98% | 39,987 psi | 63% | 2618 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 40,785 psi | 64% | 2582 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 34,447 psi | 54% | 2516 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 46,238 psi | 72% | 2690 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 39,436 psi | 62% | 2543 fps | 97.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,269 psi | 76% | 2697 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,037 psi | 77% | 2680 fps | 100% |
| Alliant Power Pro 2000-MR | 53.5 gr | 80% | 42,192 psi | 66% | 2726 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,117 psi | 61% | 2566 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,887 psi | 66% | 2628 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 82% | 32,474 psi | 51% | 2470 fps | 95% |
| Alliant Reloder-17 | 52.7 gr | 80% | 33,837 psi | 53% | 2536 fps | 97.5% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,892 psi | 47% | 2431 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 94% | 36,999 psi | 58% | 2674 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,701 psi | 72% | 2700 fps | 98.8% |
| Bofors RP3 | <<locked>> | 80% | 38,928 psi | 61% | 2572 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 44,933 psi | 70% | 2648 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,067 psi | 78% | 2684 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,413 psi | 74% | 2723 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,576 psi | 82% | 2871 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 80% | 39,581 psi | 62% | 2572 fps | 96.9% |
| Hodgdon H414 | <<locked>> | 88% | 42,003 psi | 66% | 2674 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 90% | 48,660 psi | 76% | 2749 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 46,659 psi | 73% | 2703 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,718 psi | 47% | 2369 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,888 psi | 67% | 2677 fps | 99.6% |
| Hodgdon Superformance | 62.7 gr | 90% | 44,744 psi | 70% | 2749 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,498 psi | 42% | 1545 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,875 psi | 70% | 2654 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 46,746 psi | 73% | 2697 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,437 psi | 65% | 2579 fps | 98.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,714 psi | 69% | 2595 fps | 95.6% |
| IMR 4350 | <<locked>> | 92% | 45,339 psi | 71% | 2677 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,019 psi | 69% | 2631 fps | 95.6% |
| IMR 4831 | <<locked>> | 84% | 33,257 psi | 52% | 2470 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 42,931 psi | 67% | 2657 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 80% | 48,269 psi | 76% | 2697 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,759 psi | 72% | 2674 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,195 psi | 72% | 2628 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 41,394 psi | 65% | 2582 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 38,493 psi | 60% | 2523 fps | 95.6% |
| Lovex S070 | <<locked>> | 88% | 41,481 psi | 65% | 2605 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 45,513 psi | 71% | 2648 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 45,687 psi | 72% | 2648 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,292 psi | 65% | 2615 fps | 98.8% |
| Norma 204 | <<locked>> | 96% | 51,706 psi | 81% | 2825 fps | 95.6% |
| Norma MRP | <<locked>> | 98% | 42,482 psi | 67% | 2756 fps | 95% |
| Norma URP | <<locked>> | 84% | 34,635 psi | 54% | 2513 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 40,944 psi | 64% | 2631 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 38,537 psi | 60% | 2608 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 48,341 psi | 76% | 2707 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,979 psi | 75% | 2726 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,069 psi | 82% | 2746 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,021 psi | 42% | 1585 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 54,099 psi | 85% | 2776 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,074 psi | 63% | 2559 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,498 psi | 70% | 2736 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,998 psi | 56% | 2602 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 34,113 psi | 53% | 2530 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 36,376 psi | 57% | 2589 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 49,313 psi | 77% | 2680 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,134 psi | 68% | 2595 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 36,622 psi | 57% | 2516 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 44,933 psi | 70% | 2648 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,493 psi | 60% | 2523 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,759 psi | 72% | 2674 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,394 psi | 65% | 2582 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 41,481 psi | 65% | 2605 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,565 psi | 59% | 2566 fps | 98% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,717 psi | 73% | 2684 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,817 psi | 70% | 2661 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,601 psi | 73% | 2592 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,914 psi | 61% | 2461 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,134 psi | 68% | 2575 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 52,533 psi | 82% | 2779 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,369 psi | 73% | 2595 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,528 psi | 73% | 2680 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 37,449 psi | 59% | 2523 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 27,253 psi | 43% | 2356 fps | 96.2% |
| Somchem S385 | <<locked>> | 98% | 45,672 psi | 72% | 2720 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 52,489 psi | 82% | 2648 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,978 psi | 74% | 2585 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,786 psi | 67% | 2575 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,323 psi | 68% | 2585 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,549 psi | 56% | 2457 fps | 99% |
| Vihtavuori N160 | <<locked>> | 82% | 33,823 psi | 53% | 2464 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 48,602 psi | 76% | 2697 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,669 psi | 65% | 2575 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,607 psi | 56% | 2516 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 90% | 32,198 psi | 50% | 2503 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,517 psi | 49% | 2385 fps | 96.8% |
| Winchester 748 | <<locked>> | 80% | 48,443 psi | 76% | 2743 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 42,192 psi | 66% | 2677 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 92% | 28,224 psi | 44% | 2451 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,440 psi | 70% | 2667 fps | 99.6% |
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 | 170gr | Geco SOFTPOINT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,969 fps; across all powders the maximum-charge window runs from 1,732 fps to 2,969 fps. Accurate 3100 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 56–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.308" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-16, Alliant Reloder-23 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. Hodgdon Superformance, Alliant Power Pro 2000-MR, Alliant Reloder-17 rank at the top here: for .300 RCM with the .308 | 170gr | Geco SOFTPOINT 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.