Load Specifications
Bullet Manufacturer:Speer
Bullet Weight:180 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:1:14.5
Load data in caliber .300 RCM with .308 | 180gr | Speer Deep Curl Soft Point bullet and 103 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% | 57,522 psi | 90% | 2664 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,594 psi | 89% | 2694 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,708 psi | 86% | 2713 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,303 psi | 87% | 2700 fps | 97.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,526 psi | 68% | 2608 fps | 97.2% |
| Accurate 4064 | <<locked>> | 90% | 56,623 psi | 89% | 2740 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 56,739 psi | 89% | 2835 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 86% | 56,768 psi | 89% | 2776 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 57,740 psi | 90% | 2772 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 51,314 psi | 80% | 2759 fps | 96.1% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,753 psi | 87% | 2726 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,927 psi | 89% | 2694 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,608 psi | 89% | 2897 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 50,952 psi | 80% | 2756 fps | 96.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,418 psi | 85% | 2746 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,984 psi | 86% | 2769 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 57,522 psi | 90% | 2884 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,434 psi | 87% | 2871 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 50,198 psi | 79% | 2746 fps | 96.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,423 psi | 65% | 2641 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,528 psi | 73% | 2802 fps | 99.2% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,695 psi | 89% | 2795 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 55,100 psi | 86% | 2762 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,042 psi | 86% | 2740 fps | 97.9% |
| Hodgdon Benchmark | <<locked>> | 84% | 57,276 psi | 90% | 2703 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,129 psi | 86% | 2753 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 57,435 psi | 90% | 2854 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,970 psi | 88% | 2779 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 96% | 55,709 psi | 87% | 2831 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 94% | 56,260 psi | 88% | 2792 fps | 97.6% |
| Hodgdon H4895 | <<locked>> | 86% | 57,406 psi | 90% | 2782 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,882 psi | 84% | 2762 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 57,043 psi | 89% | 2818 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 56,405 psi | 88% | 2871 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,839 psi | 56% | 1673 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,998 psi | 86% | 2733 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 57,595 psi | 90% | 2759 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 57,232 psi | 90% | 2756 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,971 psi | 89% | 2740 fps | 98.6% |
| IMR 4350 | <<locked>> | 98% | 55,419 psi | 87% | 2766 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,971 psi | 89% | 2769 fps | 98.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 57,014 psi | 89% | 2822 fps | 100% |
| IMR 4895 | <<locked>> | 88% | 56,405 psi | 88% | 2795 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,753 psi | 87% | 2726 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,811 psi | 89% | 2749 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,188 psi | 88% | 2703 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 57,101 psi | 89% | 2749 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,362 psi | 88% | 2759 fps | 99.4% |
| Lovex S070 | <<locked>> | 98% | 57,522 psi | 90% | 2799 fps | 98.9% |
| Norma 201 | <<locked>> | 86% | 55,347 psi | 87% | 2717 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,970 psi | 88% | 2717 fps | 100% |
| Norma 203B | <<locked>> | 90% | 57,682 psi | 90% | 2805 fps | 100% |
| Norma 204 | <<locked>> | 98% | 56,217 psi | 88% | 2818 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 46,369 psi | 73% | 2759 fps | 96.8% |
| Norma URP | <<locked>> | 98% | 55,666 psi | 87% | 2822 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 54,766 psi | 86% | 2782 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 54,404 psi | 85% | 2818 fps | 99.1% |
| Ramshot TAC | <<locked>> | 84% | 55,912 psi | 88% | 2749 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,680 psi | 87% | 2762 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,362 psi | 88% | 2726 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,376 psi | 57% | 1713 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,086 psi | 88% | 2759 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,622 psi | 87% | 2835 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,085 psi | 86% | 2867 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 56,478 psi | 89% | 2858 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,680 psi | 87% | 2884 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 84% | 56,449 psi | 88% | 2697 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,057 psi | 88% | 2717 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,969 psi | 86% | 2756 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 49,095 psi | 77% | 2730 fps | 96% |
| Rottweil R 907 | <<locked>> | 94% | 55,042 psi | 86% | 2740 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,362 psi | 88% | 2759 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,811 psi | 89% | 2749 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 57,101 psi | 89% | 2749 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 57,522 psi | 90% | 2799 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,840 psi | 89% | 2818 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,433 psi | 85% | 2726 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,158 psi | 86% | 2746 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,753 psi | 89% | 2654 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 57,217 psi | 90% | 2654 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,623 psi | 89% | 2717 fps | 98.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 48,617 psi | 76% | 2723 fps | 95.9% |
| Somchem S321 | <<locked>> | 82% | 57,058 psi | 89% | 2756 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 56,130 psi | 88% | 2651 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,114 psi | 85% | 2717 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 55,230 psi | 87% | 2753 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,664 psi | 84% | 2822 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,734 psi | 78% | 2710 fps | 97% |
| Vihtavuori N130 | <<locked>> | 82% | 56,449 psi | 88% | 2615 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 57,043 psi | 89% | 2635 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,985 psi | 88% | 2680 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,536 psi | 89% | 2697 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,594 psi | 89% | 2730 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,520 psi | 85% | 2766 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 56,086 psi | 88% | 2723 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,781 psi | 86% | 2697 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 57,072 psi | 89% | 2822 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,716 psi | 72% | 2710 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,665 psi | 86% | 2746 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 56,405 psi | 88% | 2772 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,941 psi | 88% | 2835 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,101 psi | 58% | 2654 fps | 99.7% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,998 psi | 86% | 2753 fps | 100% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 51,010 psi | 80% | 2579 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,874 psi | 69% | 2513 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,082 psi | 80% | 2661 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 42,844 psi | 67% | 2493 fps | 95% |
| Accurate 3100 | <<locked>> | 96% | 38,043 psi | 60% | 2503 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 41,510 psi | 65% | 2513 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 32,677 psi | 51% | 2402 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 46,978 psi | 74% | 2621 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 40,045 psi | 63% | 2480 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 98% | 48,124 psi | 75% | 2703 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,052 psi | 77% | 2625 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,850 psi | 78% | 2605 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,960 psi | 67% | 2664 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 47,819 psi | 75% | 2700 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,798 psi | 62% | 2500 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,656 psi | 67% | 2562 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,038 psi | 49% | 2362 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,418 psi | 54% | 2480 fps | 98.2% |
| Alliant Reloder-19 | <<locked>> | 98% | 47,152 psi | 74% | 2694 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 88% | 28,572 psi | 45% | 2326 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 92% | 35,215 psi | 55% | 2559 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,267 psi | 73% | 2628 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 39,755 psi | 62% | 2513 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 42,946 psi | 67% | 2530 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,763 psi | 80% | 2612 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,196 psi | 76% | 2651 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 53,388 psi | 84% | 2795 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,364 psi | 63% | 2513 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 86% | 40,176 psi | 63% | 2559 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 88% | 46,514 psi | 73% | 2635 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 47,471 psi | 74% | 2631 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,384 psi | 44% | 2264 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,627 psi | 68% | 2612 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 42,235 psi | 66% | 2625 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,760 psi | 42% | 1493 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,629 psi | 72% | 2589 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 47,558 psi | 75% | 2621 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,032 psi | 66% | 2513 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,425 psi | 70% | 2533 fps | 96.3% |
| IMR 4350 | <<locked>> | 90% | 43,149 psi | 68% | 2559 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,047 psi | 66% | 2516 fps | 95.6% |
| IMR 4831 | <<locked>> | 82% | 31,763 psi | 50% | 2362 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 43,729 psi | 69% | 2592 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 80% | 49,052 psi | 77% | 2625 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,499 psi | 73% | 2602 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,789 psi | 73% | 2559 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 42,076 psi | 66% | 2516 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 36,883 psi | 58% | 2418 fps | 95.6% |
| Lovex S070 | <<locked>> | 86% | 39,552 psi | 62% | 2493 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 46,195 psi | 72% | 2579 fps | 100% |
| Norma 202 | <<locked>> | 80% | 46,412 psi | 73% | 2579 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,047 psi | 66% | 2552 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 48,965 psi | 77% | 2700 fps | 95.5% |
| Norma MRP | <<locked>> | 96% | 40,451 psi | 63% | 2641 fps | 95% |
| Norma URP | <<locked>> | 82% | 33,069 psi | 52% | 2405 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 41,742 psi | 65% | 2569 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 36,724 psi | 58% | 2493 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 48,892 psi | 77% | 2638 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,805 psi | 76% | 2661 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,808 psi | 83% | 2674 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,122 psi | 43% | 1529 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,712 psi | 64% | 2497 fps | 96% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,266 psi | 71% | 2667 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,651 psi | 57% | 2543 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 32,387 psi | 51% | 2415 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 34,664 psi | 54% | 2474 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 50,227 psi | 79% | 2608 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,947 psi | 69% | 2530 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 37,333 psi | 59% | 2457 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 98% | 45,963 psi | 72% | 2677 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 86% | 42,946 psi | 67% | 2530 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 82% | 36,883 psi | 58% | 2418 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,499 psi | 73% | 2602 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,076 psi | 66% | 2516 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 39,552 psi | 62% | 2493 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,174 psi | 60% | 2503 fps | 98.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,529 psi | 74% | 2618 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,484 psi | 71% | 2595 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,369 psi | 74% | 2523 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,610 psi | 62% | 2398 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 41,060 psi | 64% | 2461 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 45,542 psi | 71% | 2671 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 53,156 psi | 83% | 2703 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 47,050 psi | 74% | 2523 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,123 psi | 74% | 2612 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 38,130 psi | 60% | 2461 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 27,818 psi | 44% | 2306 fps | 97.2% |
| Somchem S385 | <<locked>> | 96% | 43,584 psi | 68% | 2605 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 53,330 psi | 84% | 2572 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,761 psi | 75% | 2513 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,671 psi | 68% | 2507 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,048 psi | 69% | 2516 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,201 psi | 57% | 2398 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 32,227 psi | 51% | 2352 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 49,429 psi | 77% | 2625 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,482 psi | 67% | 2510 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 33,910 psi | 53% | 2405 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 88% | 30,937 psi | 48% | 2402 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,908 psi | 50% | 2329 fps | 97.5% |
| Winchester 748 | <<locked>> | 80% | 49,255 psi | 77% | 2667 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 40,176 psi | 63% | 2559 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 92% | 28,718 psi | 45% | 2405 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,179 psi | 71% | 2602 fps | 99.8% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 103 powders for .300 RCM loaded with the .308 | 180gr | Speer Deep Curl Soft Point. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,897 fps; across all powders the maximum-charge window runs from 1,673 fps to 2,897 fps. Accurate 3100 gives the best case fill at 100 %, and 103 of the 103 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 180.0 gr projectile in 0.308" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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.