Load Specifications
Bullet Manufacturer:Berger
Bullet Weight:175 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:1:13.0
Load data in caliber .300 RCM with .308 | 175gr | Berger OTM Tactical bullet and 98 powders. The key underlying parameters are shown in the table above.
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% | 56,304 psi | 88% | 2684 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,853 psi | 86% | 2710 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,550 psi | 89% | 2772 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 57,667 psi | 90% | 2766 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,018 psi | 66% | 2615 fps | 96.5% |
| Accurate 4064 | <<locked>> | 90% | 54,882 psi | 86% | 2756 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,563 psi | 86% | 2841 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 86% | 55,288 psi | 87% | 2789 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 56,289 psi | 88% | 2789 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,740 psi | 90% | 2789 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,158 psi | 86% | 2710 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,969 psi | 86% | 2907 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,289 psi | 88% | 2808 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,898 psi | 89% | 2831 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,883 psi | 88% | 2897 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 57,348 psi | 90% | 2936 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,958 psi | 63% | 2641 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,744 psi | 70% | 2802 fps | 98.6% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,897 psi | 86% | 2802 fps | 99.8% |
| Bofors RP3 | <<locked>> | 92% | 57,000 psi | 89% | 2825 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 57,101 psi | 89% | 2799 fps | 97.9% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,912 psi | 88% | 2720 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 57,305 psi | 90% | 2818 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,448 psi | 87% | 2864 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 54,375 psi | 85% | 2789 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 98% | 57,624 psi | 90% | 2894 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 94% | 54,491 psi | 85% | 2799 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 86% | 55,898 psi | 88% | 2799 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,156 psi | 82% | 2776 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,361 psi | 87% | 2831 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,273 psi | 85% | 2871 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,607 psi | 56% | 1690 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,956 psi | 89% | 2799 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,854 psi | 88% | 2776 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,724 psi | 87% | 2772 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,651 psi | 87% | 2753 fps | 98.2% |
| IMR 4350ᴾ | <<locked>> | 100% | 57,145 psi | 90% | 2822 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,288 psi | 87% | 2776 fps | 98.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,288 psi | 87% | 2835 fps | 99.8% |
| IMR 4895 | <<locked>> | 88% | 54,824 psi | 86% | 2812 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 57,740 psi | 90% | 2789 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,158 psi | 86% | 2766 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,810 psi | 86% | 2717 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 55,535 psi | 87% | 2766 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,897 psi | 86% | 2772 fps | 99.1% |
| Lovex S070 | <<locked>> | 98% | 55,724 psi | 87% | 2808 fps | 98.4% |
| Norma 201 | <<locked>> | 88% | 57,363 psi | 90% | 2779 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,462 psi | 85% | 2733 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,072 psi | 88% | 2818 fps | 100% |
| Norma 204 | <<locked>> | 98% | 54,375 psi | 85% | 2822 fps | 96.3% |
| Norma URPᴾ | <<locked>> | 100% | 57,290 psi | 90% | 2881 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 90% | 56,579 psi | 89% | 2844 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,927 psi | 88% | 2877 fps | 99% |
| Ramshot TAC | <<locked>> | 84% | 54,273 psi | 85% | 2756 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 86% | 57,624 psi | 90% | 2825 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,969 psi | 86% | 2740 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,129 psi | 57% | 1729 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 57,043 psi | 89% | 2766 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,607 psi | 86% | 2772 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 57,493 psi | 90% | 2897 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 57,000 psi | 89% | 2930 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,360 psi | 85% | 2864 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,824 psi | 84% | 2890 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 84% | 54,969 psi | 86% | 2713 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,578 psi | 86% | 2733 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,869 psi | 89% | 2818 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 57,101 psi | 89% | 2799 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,897 psi | 86% | 2772 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,158 psi | 86% | 2766 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,535 psi | 87% | 2766 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,724 psi | 87% | 2808 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,955 psi | 86% | 2828 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,666 psi | 89% | 2792 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 57,058 psi | 89% | 2808 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,317 psi | 87% | 2671 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,738 psi | 87% | 2671 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,158 psi | 86% | 2726 fps | 98.1% |
| Somchem S321 | <<locked>> | 82% | 55,274 psi | 87% | 2769 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,723 psi | 86% | 2671 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,985 psi | 88% | 2779 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 57,087 psi | 89% | 2815 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,590 psi | 81% | 2831 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,008 psi | 75% | 2713 fps | 96.2% |
| Vihtavuori N130 | <<locked>> | 82% | 55,317 psi | 87% | 2635 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,579 psi | 87% | 2654 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 57,638 psi | 90% | 2740 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,013 psi | 86% | 2713 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,027 psi | 86% | 2746 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,115 psi | 88% | 2825 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 54,607 psi | 86% | 2736 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,710 psi | 89% | 2759 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,143 psi | 86% | 2828 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,063 psi | 69% | 2717 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,652 psi | 89% | 2805 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,505 psi | 85% | 2782 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,056 psi | 85% | 2841 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,766 psi | 56% | 2648 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 88% | 57,188 psi | 90% | 2818 fps | 100% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 49,559 psi | 78% | 2595 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,424 psi | 66% | 2526 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,559 psi | 78% | 2677 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 47,384 psi | 74% | 2605 fps | 95.8% |
| Accurate 3100 | <<locked>> | 98% | 39,030 psi | 61% | 2556 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 40,103 psi | 63% | 2523 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,852 psi | 53% | 2461 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 45,687 psi | 72% | 2631 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 38,870 psi | 61% | 2487 fps | 97.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,732 psi | 75% | 2638 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 48,486 psi | 76% | 2625 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,669 psi | 65% | 2667 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,769 psi | 61% | 2513 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,350 psi | 65% | 2572 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 82% | 32,053 psi | 50% | 2418 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 80% | 33,344 psi | 52% | 2484 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,428 psi | 46% | 2379 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 94% | 36,260 psi | 57% | 2612 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,947 psi | 70% | 2641 fps | 98.8% |
| Bofors RP3 | <<locked>> | 80% | 38,421 psi | 60% | 2516 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 44,440 psi | 70% | 2589 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,487 psi | 78% | 2625 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,789 psi | 73% | 2664 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,764 psi | 81% | 2808 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 80% | 39,117 psi | 61% | 2520 fps | 96.9% |
| Hodgdon H414 | <<locked>> | 88% | 41,423 psi | 65% | 2618 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 90% | 48,109 psi | 75% | 2694 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 46,093 psi | 72% | 2644 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,269 psi | 46% | 2316 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,221 psi | 66% | 2621 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 90% | 43,903 psi | 69% | 2687 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,484 psi | 42% | 1509 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,324 psi | 69% | 2598 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 45,992 psi | 72% | 2635 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,828 psi | 64% | 2520 fps | 98.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,294 psi | 68% | 2543 fps | 95.6% |
| IMR 4350 | <<locked>> | 92% | 44,614 psi | 70% | 2618 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,497 psi | 68% | 2572 fps | 95.5% |
| IMR 4831 | <<locked>> | 84% | 32,706 psi | 51% | 2418 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 42,380 psi | 66% | 2602 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 80% | 47,732 psi | 75% | 2638 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,020 psi | 71% | 2615 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,585 psi | 71% | 2569 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 40,785 psi | 64% | 2526 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 38,087 psi | 60% | 2474 fps | 95.6% |
| Lovex S070 | <<locked>> | 88% | 40,828 psi | 64% | 2549 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 44,875 psi | 70% | 2589 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 45,281 psi | 71% | 2595 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,727 psi | 64% | 2559 fps | 98.8% |
| Norma 204 | <<locked>> | 96% | 50,705 psi | 79% | 2762 fps | 95.5% |
| Norma URP | <<locked>> | 84% | 34,055 psi | 53% | 2461 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 40,393 psi | 63% | 2575 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 88% | 37,869 psi | 59% | 2549 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 47,645 psi | 75% | 2648 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,427 psi | 74% | 2671 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,503 psi | 81% | 2687 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,818 psi | 42% | 1545 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,577 psi | 84% | 2717 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,537 psi | 62% | 2503 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,714 psi | 69% | 2677 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,462 psi | 56% | 2546 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 33,504 psi | 53% | 2474 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 35,969 psi | 56% | 2536 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 48,820 psi | 77% | 2625 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,685 psi | 67% | 2543 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 36,042 psi | 56% | 2461 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 44,440 psi | 70% | 2589 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,087 psi | 60% | 2474 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,020 psi | 71% | 2615 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,785 psi | 64% | 2526 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 40,828 psi | 64% | 2549 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,941 psi | 58% | 2510 fps | 97.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,195 psi | 72% | 2628 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,193 psi | 69% | 2605 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,093 psi | 72% | 2536 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,464 psi | 60% | 2411 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 42,496 psi | 67% | 2520 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 51,735 psi | 81% | 2717 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,759 psi | 72% | 2539 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,745 psi | 72% | 2621 fps | 99.4% |
| Somchem S355 | <<locked>> | 80% | 36,912 psi | 58% | 2467 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 26,847 psi | 42% | 2306 fps | 96.2% |
| Somchem S385 | <<locked>> | 98% | 44,991 psi | 71% | 2661 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 51,982 psi | 81% | 2592 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,441 psi | 73% | 2530 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,250 psi | 66% | 2520 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,728 psi | 67% | 2530 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,056 psi | 55% | 2405 fps | 99% |
| Vihtavuori N160 | <<locked>> | 82% | 33,431 psi | 52% | 2411 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 48,051 psi | 75% | 2638 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,249 psi | 65% | 2520 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,085 psi | 55% | 2464 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 90% | 31,633 psi | 50% | 2451 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,024 psi | 49% | 2333 fps | 96.7% |
| Winchester 748 | <<locked>> | 80% | 47,732 psi | 75% | 2684 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 41,423 psi | 65% | 2618 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,559 psi | 46% | 2457 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,816 psi | 69% | 2612 fps | 99.6% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 98 powders for .300 RCM loaded with the .308 | 175gr | Berger OTM Tactical. Alliant Reloder-17 delivers the highest muzzle velocity at 2,936 fps; across all powders the maximum-charge window runs from 1,690 fps to 2,936 fps. Accurate 3100 gives the best case fill at 100 %, and 98 of the 98 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 175.0 gr projectile in 0.308" calls for a 1:13.0 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.