Load Specifications
Bullet Manufacturer:Sierra
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:1:13.5
Load data in caliber .300 RCM with .308 | 165gr | Sierra SBT GameKing bullet and 101 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and Alliant Power Pro 2000-MR.
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% | 54,636 psi | 86% | 2749 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 56,420 psi | 88% | 2822 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 56,608 psi | 89% | 2818 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,766 psi | 86% | 2835 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 55,869 psi | 88% | 2818 fps | 96.9% |
| Accurate 4064 | <<locked>> | 92% | 56,550 psi | 89% | 2864 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 56,231 psi | 88% | 2946 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 88% | 57,159 psi | 90% | 2900 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 54,679 psi | 86% | 2848 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 55,956 psi | 88% | 2848 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 56,869 psi | 89% | 2822 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 56,826 psi | 89% | 3018 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 54,520 psi | 85% | 2867 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 57,348 psi | 90% | 2792 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,129 psi | 86% | 2890 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 53,882 psi | 84% | 2949 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 96% | 55,332 psi | 87% | 2989 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,551 psi | 60% | 2680 fps | 98.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,120 psi | 68% | 2841 fps | 97.6% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 57,029 psi | 89% | 2917 fps | 99.7% |
| Bofors RP3 | <<locked>> | 92% | 55,013 psi | 86% | 2881 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 55,274 psi | 87% | 2851 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 86% | 57,682 psi | 90% | 2828 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 55,477 psi | 87% | 2881 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 57,667 psi | 90% | 2982 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 82% | 56,608 psi | 89% | 2838 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 56,304 psi | 88% | 2897 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 98% | 55,622 psi | 87% | 2943 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 96% | 56,289 psi | 88% | 2907 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 88% | 57,711 psi | 90% | 2910 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,096 psi | 79% | 2825 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 57,203 psi | 90% | 2943 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 56,681 psi | 89% | 2986 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,418 psi | 56% | 1742 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 55,376 psi | 87% | 2858 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,143 psi | 85% | 2844 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 57,624 psi | 90% | 2881 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 90% | 57,551 psi | 90% | 2858 fps | 98% |
| IMR 4198 | <<locked>> | 82% | 57,363 psi | 90% | 2753 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 55,405 psi | 87% | 2874 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 96% | 57,261 psi | 90% | 2884 fps | 97.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,040 psi | 83% | 2884 fps | 99.4% |
| IMR 4895 | <<locked>> | 90% | 56,536 psi | 89% | 2920 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 55,956 psi | 88% | 2848 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 56,492 psi | 89% | 2835 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 56,869 psi | 89% | 2874 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 56,550 psi | 89% | 2825 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 57,334 psi | 90% | 2874 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 56,434 psi | 88% | 2874 fps | 98.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 57,479 psi | 90% | 2910 fps | 98.2% |
| Norma 201 | <<locked>> | 88% | 55,796 psi | 87% | 2841 fps | 100% |
| Norma 202 | <<locked>> | 88% | 56,347 psi | 88% | 2844 fps | 100% |
| Norma 203B | <<locked>> | 90% | 54,302 psi | 85% | 2877 fps | 99.9% |
| Norma 204ᴾ | <<locked>> | 100% | 56,347 psi | 88% | 2927 fps | 96% |
| Norma URPᴾ | <<locked>> | 100% | 55,332 psi | 87% | 2936 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 90% | 54,824 psi | 86% | 2900 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,259 psi | 85% | 2933 fps | 98.4% |
| Ramshot TAC | <<locked>> | 86% | 56,478 psi | 89% | 2871 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 86% | 56,101 psi | 88% | 2887 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 57,058 psi | 89% | 2851 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,882 psi | 56% | 1785 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,593 psi | 87% | 2828 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 56,492 psi | 89% | 2877 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 55,434 psi | 87% | 2956 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 55,085 psi | 86% | 2992 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 56,043 psi | 88% | 2972 fps | 99.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 55,941 psi | 88% | 3002 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 86% | 56,753 psi | 89% | 2825 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 56,202 psi | 88% | 2841 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 54,882 psi | 86% | 2874 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 55,274 psi | 87% | 2851 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 98% | 56,434 psi | 88% | 2874 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 88% | 56,869 psi | 89% | 2874 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 57,334 psi | 90% | 2874 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 57,479 psi | 90% | 2910 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 56,637 psi | 89% | 2933 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 54,824 psi | 86% | 2848 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 55,361 psi | 87% | 2867 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 57,305 psi | 90% | 2779 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 57,464 psi | 90% | 2776 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 57,145 psi | 90% | 2831 fps | 97.9% |
| Somchem S321 | <<locked>> | 84% | 57,334 psi | 90% | 2881 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 56,637 psi | 89% | 2779 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 54,447 psi | 85% | 2838 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 55,274 psi | 87% | 2871 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 49,617 psi | 78% | 2884 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 57,014 psi | 89% | 2743 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 57,479 psi | 90% | 2762 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 55,912 psi | 88% | 2805 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 56,869 psi | 89% | 2822 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 56,971 psi | 89% | 2854 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 54,288 psi | 85% | 2877 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 86% | 56,579 psi | 89% | 2848 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 54,998 psi | 86% | 2818 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 57,000 psi | 89% | 2936 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,989 psi | 66% | 2756 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 54,708 psi | 86% | 2858 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 56,521 psi | 89% | 2897 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 55,927 psi | 88% | 2949 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,621 psi | 54% | 2674 fps | 98% |
| Winchester StaBALL Match | <<locked>> | 88% | 55,347 psi | 87% | 2877 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% | 48,153 psi | 75% | 2657 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,750 psi | 83% | 2769 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,944 psi | 64% | 2582 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,805 psi | 75% | 2730 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 48,965 psi | 77% | 2707 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 38,667 psi | 61% | 2575 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 34,621 psi | 54% | 2549 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 44,469 psi | 70% | 2687 fps | 99% |
| ADI AR 2208 | <<locked>> | 80% | 37,724 psi | 59% | 2536 fps | 97% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,557 psi | 73% | 2697 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 46,847 psi | 73% | 2684 fps | 100% |
| Alliant Power Pro 2000-MR | 52.4 gr | 80% | 40,408 psi | 63% | 2717 fps | 97.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,463 psi | 59% | 2562 fps | 98.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 54,157 psi | 85% | 2753 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,219 psi | 63% | 2625 fps | 97.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 35,114 psi | 55% | 2566 fps | 95.5% |
| Alliant Reloder-17 | 51.6 gr | 80% | 32,300 psi | 51% | 2523 fps | 96.3% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,197 psi | 47% | 2461 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 96% | 37,347 psi | 59% | 2707 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,555 psi | 68% | 2690 fps | 98% |
| Bofors RP3 | <<locked>> | 80% | 36,999 psi | 58% | 2562 fps | 98.4% |
| Bofors RP7 | <<locked>> | 90% | 45,919 psi | 72% | 2690 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,167 psi | 75% | 2684 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,368 psi | 71% | 2720 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 49,995 psi | 78% | 2864 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 80% | 53,127 psi | 83% | 2792 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 37,797 psi | 59% | 2562 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 92% | 45,542 psi | 71% | 2772 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 92% | 49,530 psi | 78% | 2795 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 44,918 psi | 70% | 2700 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 30,095 psi | 47% | 2408 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,886 psi | 64% | 2671 fps | 99.2% |
| Hodgdon Superformance | <<locked>> | 92% | 45,672 psi | 72% | 2792 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,455 psi | 41% | 1558 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,975 psi | 67% | 2651 fps | 99.1% |
| IMR 3031 | <<locked>> | 80% | 44,454 psi | 70% | 2694 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,610 psi | 62% | 2569 fps | 97.7% |
| IMR 4166 Enduron | <<locked>> | 82% | 44,904 psi | 70% | 2644 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 54,114 psi | 85% | 2710 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 45,861 psi | 72% | 2713 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 88% | 44,744 psi | 70% | 2671 fps | 95.2% |
| IMR 4831 | <<locked>> | 86% | 33,649 psi | 53% | 2510 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 41,205 psi | 65% | 2654 fps | 98.5% |
| IMR 8208 XBR | <<locked>> | 80% | 46,557 psi | 73% | 2697 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 52,547 psi | 82% | 2779 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,627 psi | 68% | 2671 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,382 psi | 70% | 2625 fps | 99% |
| Lovex S062 | <<locked>> | 80% | 39,508 psi | 62% | 2575 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 39,131 psi | 61% | 2566 fps | 95.2% |
| Lovex S070 | <<locked>> | 92% | 44,701 psi | 70% | 2697 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 43,540 psi | 68% | 2641 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 43,903 psi | 69% | 2651 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,610 psi | 62% | 2612 fps | 98.2% |
| Norma 204 | <<locked>> | 98% | 52,562 psi | 82% | 2867 fps | 95.2% |
| Norma URP | <<locked>> | 86% | 35,099 psi | 55% | 2556 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 39,102 psi | 61% | 2625 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 92% | 41,742 psi | 65% | 2707 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 46,354 psi | 73% | 2700 fps | 97.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,818 psi | 72% | 2720 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,183 psi | 79% | 2746 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,760 psi | 42% | 1598 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,011 psi | 82% | 2776 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 43,642 psi | 68% | 2657 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,206 psi | 66% | 2726 fps | 98.2% |
| ReloadSwiss RS 60 | 51.6 gr | 80% | 34,389 psi | 54% | 2592 fps | 99.2% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 37,014 psi | 58% | 2628 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 39,697 psi | 62% | 2694 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 47,485 psi | 74% | 2684 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,437 psi | 65% | 2592 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 80% | 34,780 psi | 55% | 2507 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 90% | 45,919 psi | 72% | 2690 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 86% | 39,131 psi | 61% | 2566 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,627 psi | 68% | 2671 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,508 psi | 62% | 2575 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 92% | 44,701 psi | 70% | 2697 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,824 psi | 56% | 2556 fps | 97% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,585 psi | 70% | 2674 fps | 97.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,989 psi | 67% | 2657 fps | 98.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,918 psi | 70% | 2595 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,333 psi | 59% | 2464 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 43,874 psi | 69% | 2615 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 50,241 psi | 79% | 2776 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,527 psi | 70% | 2598 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,367 psi | 70% | 2671 fps | 98.9% |
| Somchem S355 | <<locked>> | 80% | 35,694 psi | 56% | 2513 fps | 97.6% |
| Somchem S365 | <<locked>> | 82% | 27,557 psi | 43% | 2392 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 50,633 psi | 79% | 2657 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,208 psi | 71% | 2589 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,886 psi | 64% | 2575 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,423 psi | 65% | 2585 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,852 psi | 53% | 2448 fps | 98.3% |
| Vihtavuori N160 | <<locked>> | 84% | 34,330 psi | 54% | 2500 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 46,586 psi | 73% | 2694 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 39,885 psi | 63% | 2572 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 36,100 psi | 57% | 2559 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 92% | 32,329 psi | 51% | 2539 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,095 psi | 47% | 2369 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 46,282 psi | 73% | 2740 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 45,745 psi | 72% | 2776 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 30,342 psi | 48% | 2539 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,293 psi | 66% | 2657 fps | 99.1% |
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 101 powders for .300 RCM loaded with the .308 | 165gr | Sierra SBT GameKing. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,018 fps; across all powders the maximum-charge window runs from 1,742 fps to 3,018 fps. Accurate 4350 gives the best case fill at 100 %, and 101 of the 101 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:13.5 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 Reloder-17, ReloadSwiss RS 60, Alliant Power Pro 2000-MR rank at the top here: for .300 RCM with the .308 | 165gr | Sierra SBT GameKing 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.