Load Specifications
Load data in caliber .300 RCM with .308 | 185gr | Berger Hybrid Target 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 ReloadSwiss RS 60.
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% | 55,825 psi | 87% | 2585 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,534 psi | 85% | 2612 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,173 psi | 88% | 2677 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 57,174 psi | 90% | 2667 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 41,408 psi | 65% | 2523 fps | 96.6% |
| Accurate 4064 | <<locked>> | 90% | 54,505 psi | 85% | 2657 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 53,983 psi | 85% | 2740 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 54,737 psi | 86% | 2687 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 55,724 psi | 87% | 2687 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,203 psi | 90% | 2684 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,723 psi | 86% | 2612 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,462 psi | 85% | 2805 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,767 psi | 87% | 2710 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,362 psi | 88% | 2730 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,317 psi | 87% | 2795 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 56,695 psi | 89% | 2831 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,537 psi | 62% | 2549 fps | 99.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,164 psi | 69% | 2703 fps | 98.7% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,534 psi | 85% | 2703 fps | 99.8% |
| Bofors RP3 | <<locked>> | 92% | 56,710 psi | 89% | 2730 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,608 psi | 89% | 2700 fps | 98.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,709 psi | 87% | 2625 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,884 psi | 89% | 2720 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,129 psi | 86% | 2766 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 57,406 psi | 90% | 2740 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 98% | 56,971 psi | 89% | 2792 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 96% | 57,725 psi | 90% | 2756 fps | 97.7% |
| Hodgdon H4895 | <<locked>> | 86% | 55,274 psi | 87% | 2697 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,532 psi | 81% | 2674 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,650 psi | 86% | 2730 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 53,925 psi | 85% | 2776 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,665 psi | 56% | 1624 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,550 psi | 89% | 2697 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,564 psi | 87% | 2677 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,288 psi | 87% | 2671 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,317 psi | 87% | 2654 fps | 98.3% |
| IMR 4350ᴾ | <<locked>> | 100% | 56,782 psi | 89% | 2726 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,027 psi | 86% | 2680 fps | 98.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,607 psi | 86% | 2733 fps | 99.8% |
| IMR 4895 | <<locked>> | 88% | 54,404 psi | 85% | 2713 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 57,203 psi | 90% | 2684 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,476 psi | 85% | 2664 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 57,667 psi | 90% | 2664 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 55,129 psi | 86% | 2667 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 57,725 psi | 90% | 2723 fps | 99.5% |
| Lovex S070 | <<locked>> | 98% | 55,143 psi | 86% | 2707 fps | 98.5% |
| Norma 201 | <<locked>> | 88% | 57,101 psi | 89% | 2684 fps | 100% |
| Norma 202 | <<locked>> | 88% | 57,711 psi | 90% | 2680 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,521 psi | 87% | 2717 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 57,653 psi | 90% | 2776 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 44,237 psi | 69% | 2664 fps | 96.1% |
| Norma URPᴾ | <<locked>> | 100% | 56,855 psi | 89% | 2782 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 90% | 56,188 psi | 88% | 2743 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,579 psi | 87% | 2782 fps | 99.1% |
| Ramshot TAC | <<locked>> | 86% | 57,595 psi | 90% | 2713 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 86% | 57,203 psi | 90% | 2726 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,578 psi | 86% | 2641 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,998 psi | 56% | 1660 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,840 psi | 89% | 2667 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 57,725 psi | 90% | 2723 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 57,000 psi | 89% | 2795 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,536 psi | 89% | 2828 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 57,406 psi | 90% | 2815 fps | 99.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 57,029 psi | 89% | 2844 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 84% | 54,766 psi | 86% | 2615 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 57,566 psi | 90% | 2680 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,492 psi | 89% | 2720 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,608 psi | 89% | 2700 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 98% | 57,725 psi | 90% | 2723 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,476 psi | 85% | 2664 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,129 psi | 86% | 2667 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,143 psi | 86% | 2707 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,433 psi | 85% | 2726 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,014 psi | 88% | 2690 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,608 psi | 89% | 2710 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,303 psi | 87% | 2579 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,245 psi | 87% | 2575 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,592 psi | 86% | 2628 fps | 98.2% |
| Somchem S321 | <<locked>> | 82% | 54,897 psi | 86% | 2671 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,607 psi | 86% | 2575 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,651 psi | 87% | 2680 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 56,710 psi | 89% | 2713 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,155 psi | 80% | 2733 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 47,485 psi | 74% | 2621 fps | 96.4% |
| Vihtavuori N130 | <<locked>> | 82% | 54,969 psi | 86% | 2536 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,550 psi | 87% | 2562 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 57,246 psi | 90% | 2638 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,520 psi | 85% | 2615 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,752 psi | 86% | 2648 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,622 psi | 87% | 2723 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 54,259 psi | 85% | 2641 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,347 psi | 88% | 2661 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 54,824 psi | 86% | 2733 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,569 psi | 68% | 2625 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,912 psi | 88% | 2703 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,056 psi | 85% | 2684 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 57,305 psi | 90% | 2799 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,505 psi | 56% | 2562 fps | 99.3% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,550 psi | 89% | 2717 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% | 49,371 psi | 77% | 2503 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,134 psi | 66% | 2438 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,168 psi | 77% | 2579 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 44,077 psi | 69% | 2461 fps | 95.2% |
| Accurate 3100 | <<locked>> | 96% | 36,114 psi | 57% | 2418 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 39,871 psi | 62% | 2434 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 31,169 psi | 49% | 2320 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 45,498 psi | 71% | 2543 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 38,595 psi | 60% | 2398 fps | 98% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,601 psi | 75% | 2546 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 48,080 psi | 75% | 2526 fps | 100% |
| Alliant Power Pro 2000-MR | 49 gr | 80% | 41,408 psi | 65% | 2579 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,305 psi | 60% | 2421 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,220 psi | 65% | 2484 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 82% | 31,763 psi | 50% | 2333 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 33,025 psi | 52% | 2395 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,167 psi | 46% | 2297 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 92% | 33,547 psi | 53% | 2464 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,686 psi | 70% | 2549 fps | 98.9% |
| Bofors RP3 | <<locked>> | 80% | 38,087 psi | 60% | 2431 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 44,266 psi | 69% | 2503 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,255 psi | 77% | 2533 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,485 psi | 73% | 2569 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,242 psi | 80% | 2707 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 80% | 38,856 psi | 61% | 2431 fps | 97.1% |
| Hodgdon H414 | <<locked>> | 88% | 41,002 psi | 64% | 2526 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 90% | 47,688 psi | 75% | 2598 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 45,934 psi | 72% | 2552 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,354 psi | 43% | 2192 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,814 psi | 66% | 2526 fps | 99.7% |
| Hodgdon Superformance | 57.4 gr | 90% | 43,656 psi | 68% | 2598 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,542 psi | 42% | 1447 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,932 psi | 69% | 2503 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 45,614 psi | 71% | 2539 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,538 psi | 64% | 2431 fps | 98.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,960 psi | 67% | 2451 fps | 95.8% |
| IMR 4350 | <<locked>> | 92% | 44,266 psi | 69% | 2526 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 40,553 psi | 64% | 2431 fps | 95% |
| IMR 4831 | <<locked>> | 84% | 32,532 psi | 51% | 2336 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 42,221 psi | 66% | 2513 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 47,601 psi | 75% | 2546 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,730 psi | 70% | 2520 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,339 psi | 71% | 2477 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 40,495 psi | 63% | 2434 fps | 99.6% |
| Lovex S065 | <<locked>> | 82% | 35,462 psi | 56% | 2336 fps | 95% |
| Lovex S070 | <<locked>> | 88% | 40,422 psi | 63% | 2457 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 44,599 psi | 70% | 2497 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 44,788 psi | 70% | 2500 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,582 psi | 64% | 2474 fps | 99% |
| Norma 204 | <<locked>> | 96% | 50,343 psi | 79% | 2667 fps | 95.7% |
| Norma MRP | <<locked>> | 98% | 41,379 psi | 65% | 2605 fps | 95.1% |
| Norma URP | <<locked>> | 82% | 31,647 psi | 50% | 2323 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 40,118 psi | 63% | 2487 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 37,521 psi | 59% | 2464 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 47,456 psi | 74% | 2559 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,876 psi | 73% | 2572 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,242 psi | 80% | 2592 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,905 psi | 42% | 1483 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,243 psi | 83% | 2618 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,131 psi | 61% | 2415 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,468 psi | 68% | 2582 fps | 99.1% |
| ReloadSwiss RS 60 | 48.2 gr | 80% | 35,157 psi | 55% | 2457 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 33,199 psi | 52% | 2388 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 35,694 psi | 56% | 2451 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 48,646 psi | 76% | 2530 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,366 psi | 66% | 2448 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 35,868 psi | 56% | 2379 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 88% | 44,266 psi | 69% | 2503 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 82% | 35,462 psi | 56% | 2336 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,730 psi | 70% | 2520 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,495 psi | 63% | 2434 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 40,422 psi | 63% | 2457 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,753 psi | 58% | 2425 fps | 98.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,687 psi | 72% | 2533 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,947 psi | 69% | 2513 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,919 psi | 72% | 2448 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,261 psi | 60% | 2323 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 42,148 psi | 66% | 2431 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 51,459 psi | 81% | 2621 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,542 psi | 71% | 2448 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,513 psi | 71% | 2530 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 36,666 psi | 57% | 2382 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 26,585 psi | 42% | 2224 fps | 96.5% |
| Somchem S385 | <<locked>> | 98% | 44,599 psi | 70% | 2572 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 51,735 psi | 81% | 2497 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,253 psi | 72% | 2438 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,018 psi | 66% | 2431 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,540 psi | 67% | 2441 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,853 psi | 55% | 2320 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 82% | 33,040 psi | 52% | 2323 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 47,718 psi | 75% | 2543 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 40,973 psi | 64% | 2434 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 32,634 psi | 51% | 2329 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 88% | 29,399 psi | 46% | 2320 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,850 psi | 48% | 2254 fps | 97% |
| Winchester 748 | <<locked>> | 80% | 47,326 psi | 74% | 2585 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 41,220 psi | 65% | 2530 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 92% | 27,470 psi | 43% | 2316 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,468 psi | 68% | 2516 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 | 185gr | Berger Hybrid Target. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,844 fps; across all powders the maximum-charge window runs from 1,624 fps to 2,844 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 185.0 gr projectile in 0.308" calls for a 1:11.0 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. Alliant Power Pro 2000-MR, Hodgdon Superformance, ReloadSwiss RS 60 rank at the top here: for .300 RCM with the .308 | 185gr | Berger Hybrid Target 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.