Load Specifications
Bullet:.308 | 165gr | Geco STAR
Bullet Manufacturer:Geco
Bullet Weight:165 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 | 165gr | Geco STAR bullet and 105 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, Alliant Reloder-17 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>> | 86% | 55,477 psi | 87% | 2759 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 57,653 psi | 90% | 2838 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 56,826 psi | 89% | 2822 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,753 psi | 87% | 2848 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 57,116 psi | 90% | 2828 fps | 97% |
| Accurate 4064 | <<locked>> | 94% | 56,826 psi | 89% | 2871 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,026 psi | 83% | 2897 fps | 99.3% |
| ADI AR 2206H | <<locked>> | 88% | 54,563 psi | 86% | 2858 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 94% | 55,811 psi | 87% | 2858 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 88% | 57,203 psi | 90% | 2861 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 54,447 psi | 85% | 2792 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,434 psi | 87% | 2917 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,418 psi | 85% | 2976 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,347 psi | 87% | 2877 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,274 psi | 87% | 2766 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 56,028 psi | 88% | 2900 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,634 psi | 81% | 2907 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 98% | 56,333 psi | 88% | 3002 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,332 psi | 57% | 2625 fps | 97.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,335 psi | 63% | 2772 fps | 96.5% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 57,348 psi | 90% | 2746 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,679 psi | 86% | 2877 fps | 99.5% |
| Bofors RP3 | <<locked>> | 94% | 56,057 psi | 88% | 2897 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 56,463 psi | 88% | 2861 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,825 psi | 87% | 2799 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 56,666 psi | 89% | 2894 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,998 psi | 86% | 2940 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 54,491 psi | 85% | 2808 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,492 psi | 87% | 2831 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 57,334 psi | 90% | 2910 fps | 99.4% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 56,536 psi | 89% | 2953 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 98% | 57,609 psi | 90% | 2920 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 88% | 55,085 psi | 86% | 2867 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,659 psi | 75% | 2782 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 54,346 psi | 85% | 2900 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 53,795 psi | 84% | 2933 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,012 psi | 55% | 1729 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,768 psi | 89% | 2874 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 55,129 psi | 86% | 2854 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,143 psi | 86% | 2841 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,608 psi | 87% | 2822 fps | 97.5% |
| IMR 4198 | <<locked>> | 82% | 55,579 psi | 87% | 2726 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,982 psi | 83% | 2828 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,129 psi | 86% | 2844 fps | 97.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,517 psi | 79% | 2841 fps | 99.1% |
| IMR 4895 | <<locked>> | 92% | 57,450 psi | 90% | 2930 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 57,203 psi | 90% | 2861 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 57,479 psi | 90% | 2848 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 53,925 psi | 85% | 2831 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,520 psi | 85% | 2789 fps | 99.9% |
| Lovex S062 | <<locked>> | 92% | 54,650 psi | 86% | 2835 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 57,246 psi | 90% | 2881 fps | 98.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,723 psi | 86% | 2864 fps | 97.6% |
| Norma 201 | <<locked>> | 90% | 56,782 psi | 89% | 2854 fps | 100% |
| Norma 202 | <<locked>> | 90% | 57,493 psi | 90% | 2858 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,187 psi | 86% | 2887 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 52,562 psi | 82% | 2890 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 92% | 55,883 psi | 88% | 2913 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,459 psi | 81% | 2881 fps | 97.8% |
| Ramshot TAC | <<locked>> | 86% | 54,244 psi | 85% | 2828 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 88% | 57,450 psi | 90% | 2904 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,694 psi | 86% | 2812 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,404 psi | 55% | 1772 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 56,782 psi | 89% | 2841 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 57,725 psi | 90% | 2890 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 56,666 psi | 89% | 2969 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 56,289 psi | 88% | 3005 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,895 psi | 83% | 2920 fps | 99.1% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,301 psi | 84% | 2953 fps | 98.9% |
| Rottweil R 901 | <<locked>> | 88% | 57,464 psi | 90% | 2831 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 57,246 psi | 90% | 2851 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,637 psi | 87% | 2881 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 56,463 psi | 88% | 2861 fps | 97.1% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 57,246 psi | 90% | 2881 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 88% | 53,925 psi | 85% | 2831 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,650 psi | 86% | 2835 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,723 psi | 86% | 2864 fps | 97.6% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 56,391 psi | 88% | 2815 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,201 psi | 85% | 2894 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,376 psi | 88% | 2789 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 56,130 psi | 88% | 2861 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 56,666 psi | 89% | 2881 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,245 psi | 87% | 2749 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,317 psi | 87% | 2746 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,549 psi | 85% | 2785 fps | 97.3% |
| Somchem S321 | <<locked>> | 84% | 55,027 psi | 86% | 2844 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,375 psi | 85% | 2746 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,811 psi | 87% | 2851 fps | 99.9% |
| Somchem S355 | <<locked>> | 96% | 56,130 psi | 88% | 2881 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,804 psi | 73% | 2835 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 54,911 psi | 86% | 2713 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,463 psi | 87% | 2733 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 56,681 psi | 89% | 2812 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,592 psi | 86% | 2789 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,143 psi | 85% | 2812 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,143 psi | 86% | 2884 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 86% | 54,288 psi | 85% | 2812 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 55,956 psi | 88% | 2828 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,998 psi | 85% | 2890 fps | 99.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,392 psi | 62% | 2703 fps | 97.5% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,985 psi | 88% | 2871 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 53,882 psi | 84% | 2858 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 56,855 psi | 89% | 2959 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,387 psi | 51% | 2602 fps | 96.6% |
| Winchester StaBALL Match | <<locked>> | 90% | 56,637 psi | 89% | 2894 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% | 45,774 psi | 72% | 2618 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,125 psi | 79% | 2733 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,072 psi | 60% | 2536 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,223 psi | 71% | 2687 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 50,024 psi | 78% | 2717 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 36,071 psi | 57% | 2523 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 34,577 psi | 54% | 2549 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 42,221 psi | 66% | 2644 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 80% | 35,926 psi | 56% | 2493 fps | 96.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,353 psi | 70% | 2654 fps | 99.6% |
| Alliant AR-Comp | <<locked>> | 80% | 44,425 psi | 70% | 2648 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 51,880 psi | 81% | 2861 fps | 99.9% |
| Alliant Power Pro 2000-MR | 51.2 gr | 80% | 38,392 psi | 60% | 2664 fps | 96.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,418 psi | 56% | 2516 fps | 97.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,764 psi | 81% | 2717 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,971 psi | 60% | 2575 fps | 97.1% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,433 psi | 56% | 2572 fps | 95.5% |
| Alliant Reloder-17 | 50.4 gr | 80% | 30,414 psi | 48% | 2467 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 96% | 32,097 psi | 50% | 2516 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 37,753 psi | 59% | 2710 fps | 95.5% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 53,737 psi | 84% | 2697 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,510 psi | 65% | 2648 fps | 97.4% |
| Bofors RP3 | <<locked>> | 80% | 34,751 psi | 54% | 2513 fps | 97.7% |
| Bofors RP7 | <<locked>> | 94% | 49,632 psi | 78% | 2753 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,296 psi | 73% | 2651 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,062 psi | 67% | 2677 fps | 99.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,659 psi | 75% | 2822 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 80% | 50,995 psi | 80% | 2756 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,750 psi | 81% | 2779 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 38,218 psi | 60% | 2572 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 94% | 46,137 psi | 72% | 2779 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 94% | 50,691 psi | 79% | 2808 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 42,612 psi | 67% | 2654 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 30,327 psi | 48% | 2415 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,667 psi | 61% | 2625 fps | 98.7% |
| Hodgdon Superformance | <<locked>> | 94% | 46,615 psi | 73% | 2805 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,063 psi | 41% | 1545 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,118 psi | 64% | 2612 fps | 98.7% |
| IMR 3031 | <<locked>> | 80% | 42,105 psi | 66% | 2654 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,681 psi | 59% | 2526 fps | 97.1% |
| IMR 4166 Enduron | <<locked>> | 84% | 45,788 psi | 72% | 2657 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 52,286 psi | 82% | 2680 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 46,630 psi | 73% | 2723 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 90% | 45,672 psi | 72% | 2684 fps | 95.3% |
| IMR 4831 | <<locked>> | 90% | 36,100 psi | 57% | 2566 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 38,899 psi | 61% | 2605 fps | 97.9% |
| IMR 8208 XBR | <<locked>> | 80% | 44,353 psi | 70% | 2654 fps | 99.6% |
| Lovex D073.5 | <<locked>> | 80% | 49,966 psi | 78% | 2740 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,089 psi | 64% | 2625 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 42,540 psi | 67% | 2585 fps | 98.6% |
| Lovex S062 | <<locked>> | 80% | 37,405 psi | 59% | 2530 fps | 98.6% |
| Lovex S065 | <<locked>> | 88% | 39,494 psi | 62% | 2572 fps | 95.2% |
| Lovex S070 | <<locked>> | 94% | 45,136 psi | 71% | 2703 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 41,307 psi | 65% | 2598 fps | 99.3% |
| Norma 202 | <<locked>> | 80% | 41,756 psi | 65% | 2612 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,318 psi | 58% | 2562 fps | 97.5% |
| Norma URP | <<locked>> | 88% | 35,346 psi | 55% | 2559 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 36,999 psi | 58% | 2579 fps | 97.2% |
| Ramshot Hunter | <<locked>> | 94% | 42,250 psi | 66% | 2710 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 44,353 psi | 70% | 2661 fps | 96.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,685 psi | 68% | 2677 fps | 98.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,124 psi | 75% | 2707 fps | 99.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,295 psi | 41% | 1581 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,966 psi | 78% | 2743 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 41,582 psi | 65% | 2615 fps | 95% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,798 psi | 62% | 2677 fps | 97.5% |
| ReloadSwiss RS 60 | 50.4 gr | 80% | 32,474 psi | 51% | 2539 fps | 98.6% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 37,086 psi | 58% | 2628 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 40,234 psi | 63% | 2697 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 44,962 psi | 70% | 2641 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,204 psi | 61% | 2549 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 80% | 32,547 psi | 51% | 2454 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 94% | 49,632 psi | 78% | 2753 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 39,494 psi | 62% | 2572 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,089 psi | 64% | 2625 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 37,405 psi | 59% | 2530 fps | 98.6% |
| Shooters World SW4350 | <<locked>> | 94% | 45,136 psi | 71% | 2703 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,881 psi | 83% | 2762 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,765 psi | 53% | 2507 fps | 96.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,765 psi | 83% | 2740 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,308 psi | 66% | 2628 fps | 96.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,857 psi | 64% | 2615 fps | 98.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,830 psi | 67% | 2559 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,447 psi | 56% | 2421 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 44,643 psi | 70% | 2628 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 47,979 psi | 75% | 2736 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 42,438 psi | 67% | 2562 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,279 psi | 66% | 2631 fps | 98.5% |
| Somchem S355 | <<locked>> | 80% | 33,605 psi | 53% | 2464 fps | 96.8% |
| Somchem S365 | <<locked>> | 84% | 27,572 psi | 43% | 2392 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 48,515 psi | 76% | 2621 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,163 psi | 68% | 2556 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,566 psi | 60% | 2536 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,378 psi | 62% | 2546 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,894 psi | 50% | 2402 fps | 97.6% |
| Vihtavuori N160 | <<locked>> | 88% | 36,927 psi | 58% | 2562 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 44,541 psi | 70% | 2654 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 80% | 37,927 psi | 59% | 2533 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 36,332 psi | 57% | 2562 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 96% | 34,360 psi | 54% | 2592 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,429 psi | 48% | 2379 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 43,976 psi | 69% | 2697 fps | 99.9% |
| Winchester 760 | <<locked>> | 94% | 46,412 psi | 73% | 2785 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 30,385 psi | 48% | 2536 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,103 psi | 63% | 2615 fps | 98.6% |
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 105 powders for .300 RCM loaded with the .308 | 165gr | Geco STAR. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,005 fps; across all powders the maximum-charge window runs from 1,729 fps to 3,005 fps. Accurate 4350 gives the best case fill at 100 %, and 105 of the 105 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, 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, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .300 RCM with the .308 | 165gr | Geco STAR 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.