Load Specifications
Load data in caliber .300 RCM with .308 | 150gr | Impala LWH CHP 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, ReloadSwiss RS 60 and Alliant Reloder-17.
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.
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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% | 57,058 psi | 89% | 2890 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,651 psi | 87% | 2913 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 56,376 psi | 88% | 2920 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 57,363 psi | 90% | 2979 fps | 100% |
| Accurate 4064 | <<locked>> | 92% | 56,072 psi | 88% | 2963 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 54,404 psi | 85% | 3022 fps | 98.8% |
| ADI AR 2206H | <<locked>> | 88% | 55,753 psi | 87% | 2982 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 94% | 56,202 psi | 88% | 2969 fps | 99.3% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,766 psi | 86% | 2933 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 86% | 55,216 psi | 87% | 2917 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 56,391 psi | 88% | 3041 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,636 psi | 86% | 3084 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 56,449 psi | 88% | 3002 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 82% | 56,318 psi | 88% | 2890 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 57,058 psi | 89% | 3022 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,054 psi | 82% | 3015 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 98% | 56,710 psi | 89% | 3117 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,029 psi | 60% | 2746 fps | 96.8% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 57,725 psi | 90% | 2861 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,114 psi | 86% | 2989 fps | 99% |
| Bofors RP3 | <<locked>> | 94% | 57,290 psi | 90% | 3018 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 57,305 psi | 90% | 2972 fps | 96.1% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,594 psi | 89% | 2917 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 57,522 psi | 90% | 3015 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,274 psi | 87% | 3054 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 82% | 55,172 psi | 86% | 2930 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 56,202 psi | 88% | 2953 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,810 psi | 86% | 2972 fps | 98.4% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 56,942 psi | 89% | 3064 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 88% | 56,289 psi | 88% | 2995 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,399 psi | 76% | 2890 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,056 psi | 86% | 3022 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,694 psi | 56% | 1818 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 57,145 psi | 90% | 2989 fps | 99.8% |
| IMR 3031 | <<locked>> | 88% | 55,898 psi | 88% | 2982 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,811 psi | 87% | 2956 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 90% | 56,202 psi | 88% | 2930 fps | 96.5% |
| IMR 4198 | <<locked>> | 82% | 55,738 psi | 87% | 2844 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,492 psi | 87% | 2949 fps | 96.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,372 psi | 81% | 2956 fps | 98.4% |
| IMR 4895 | <<locked>> | 90% | 55,114 psi | 86% | 3002 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 86% | 54,766 psi | 86% | 2933 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 82% | 55,419 psi | 87% | 2923 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,651 psi | 87% | 2963 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,201 psi | 87% | 2904 fps | 99.5% |
| Lovex S062 | <<locked>> | 92% | 56,144 psi | 88% | 2963 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,129 psi | 86% | 2949 fps | 97.7% |
| Lovex S070ᴾ | <<locked>> | 100% | 56,028 psi | 88% | 2982 fps | 96.8% |
| Norma 201 | <<locked>> | 88% | 54,897 psi | 86% | 2930 fps | 99.9% |
| Norma 202 | <<locked>> | 88% | 55,013 psi | 86% | 2933 fps | 100% |
| Norma 203B | <<locked>> | 92% | 56,289 psi | 88% | 3009 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 53,287 psi | 84% | 3005 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 92% | 56,434 psi | 88% | 3028 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,243 psi | 82% | 2992 fps | 96.8% |
| Ramshot TAC | <<locked>> | 86% | 54,955 psi | 86% | 2940 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,346 psi | 85% | 2963 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,767 psi | 87% | 2933 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,998 psi | 56% | 1857 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 57,537 psi | 90% | 2966 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 54,897 psi | 86% | 2946 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 57,029 psi | 89% | 3087 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 56,449 psi | 88% | 3120 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 53,621 psi | 84% | 3038 fps | 98.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,911 psi | 84% | 3058 fps | 98.1% |
| Rottweil R 901 | <<locked>> | 86% | 56,608 psi | 89% | 2923 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 55,317 psi | 87% | 2927 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 96% | 57,145 psi | 90% | 3009 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 98% | 57,305 psi | 90% | 2972 fps | 96.1% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,129 psi | 86% | 2949 fps | 97.7% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,651 psi | 87% | 2963 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 56,144 psi | 88% | 2963 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 56,028 psi | 88% | 2982 fps | 96.8% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 57,435 psi | 90% | 2933 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,607 psi | 86% | 3009 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,724 psi | 89% | 2907 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 57,116 psi | 90% | 2976 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 57,188 psi | 90% | 2995 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 56,231 psi | 88% | 2871 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,912 psi | 88% | 2864 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,492 psi | 87% | 2894 fps | 96.4% |
| Somchem S321 | <<locked>> | 84% | 56,014 psi | 88% | 2966 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,637 psi | 87% | 2867 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 56,304 psi | 88% | 2966 fps | 99.6% |
| Somchem S355 | <<locked>> | 96% | 57,159 psi | 90% | 3002 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,964 psi | 75% | 2956 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 55,956 psi | 88% | 2835 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 56,188 psi | 88% | 2854 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 54,534 psi | 85% | 2897 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,361 psi | 87% | 2910 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,288 psi | 87% | 2933 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,695 psi | 87% | 2999 fps | 98.8% |
| Vihtavuori N530 | <<locked>> | 86% | 55,100 psi | 86% | 2930 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 92% | 56,985 psi | 89% | 2953 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,911 psi | 86% | 3005 fps | 98.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,944 psi | 64% | 2828 fps | 96.8% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 56,420 psi | 88% | 2979 fps | 99.9% |
| Winchester 748 | <<locked>> | 86% | 54,824 psi | 86% | 2982 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 57,261 psi | 90% | 3068 fps | 96.9% |
| Winchester StaBALL Match | <<locked>> | 90% | 57,174 psi | 90% | 3009 fps | 99.9% |
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% | 47,790 psi | 75% | 2749 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,185 psi | 82% | 2861 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,785 psi | 65% | 2690 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,340 psi | 74% | 2822 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 39,407 psi | 62% | 2677 fps | 99.8% |
| Accurate 4350 | <<locked>> | 90% | 39,378 psi | 62% | 2743 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 43,816 psi | 69% | 2766 fps | 98% |
| ADI AR 2208 | <<locked>> | 80% | 37,420 psi | 59% | 2612 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,585 psi | 71% | 2776 fps | 99.2% |
| Alliant AR-Comp | <<locked>> | 80% | 45,774 psi | 72% | 2779 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,982 psi | 83% | 2986 fps | 99.6% |
| Alliant Power Pro 2000-MR | 51.5 gr | 80% | 39,697 psi | 62% | 2779 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,101 psi | 58% | 2638 fps | 97.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 53,301 psi | 84% | 2848 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,726 psi | 62% | 2697 fps | 96.4% |
| Alliant Reloder-16 | <<locked>> | 90% | 39,102 psi | 61% | 2740 fps | 95.4% |
| Alliant Reloder-17 | 52 gr | 82% | 34,345 psi | 54% | 2651 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 96% | 33,968 psi | 53% | 2638 fps | 95.1% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 54,317 psi | 85% | 2815 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,685 psi | 67% | 2762 fps | 96.7% |
| Bofors RP3 | <<locked>> | 80% | 37,173 psi | 58% | 2651 fps | 97.4% |
| Bofors RP7 | <<locked>> | 96% | 53,983 psi | 85% | 2917 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,471 psi | 74% | 2769 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,614 psi | 70% | 2802 fps | 99.4% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,356 psi | 76% | 2936 fps | 98.4% |
| Hodgdon H322 | <<locked>> | 80% | 51,909 psi | 81% | 2881 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,663 psi | 83% | 2900 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 40,147 psi | 63% | 2694 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 96% | 50,140 psi | 79% | 2949 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 44,135 psi | 69% | 2779 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 34,011 psi | 53% | 2582 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,016 psi | 63% | 2746 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,701 psi | 42% | 1624 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,351 psi | 66% | 2726 fps | 98.1% |
| IMR 3031 | <<locked>> | 80% | 43,555 psi | 68% | 2782 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,233 psi | 61% | 2644 fps | 96.4% |
| IMR 4166 Enduron | <<locked>> | 86% | 49,951 psi | 78% | 2825 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 52,678 psi | 83% | 2799 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 52,373 psi | 82% | 2897 fps | 95.6% |
| IMR 4831 | <<locked>> | 90% | 37,782 psi | 59% | 2687 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 40,669 psi | 64% | 2733 fps | 97.3% |
| IMR 8208 XBR | <<locked>> | 80% | 45,585 psi | 71% | 2776 fps | 99.2% |
| Lovex D073.5 | <<locked>> | 80% | 51,924 psi | 81% | 2867 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,207 psi | 68% | 2756 fps | 99.7% |
| Lovex S060 | <<locked>> | 80% | 43,845 psi | 69% | 2700 fps | 98% |
| Lovex S062 | <<locked>> | 80% | 39,494 psi | 62% | 2657 fps | 98.2% |
| Lovex S065 | <<locked>> | 90% | 43,816 psi | 69% | 2743 fps | 95.2% |
| Lovex S070 | <<locked>> | 96% | 49,705 psi | 78% | 2874 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 43,526 psi | 68% | 2730 fps | 98.9% |
| Norma 202 | <<locked>> | 80% | 43,250 psi | 68% | 2733 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 39,131 psi | 61% | 2687 fps | 96.9% |
| Norma URP | <<locked>> | 90% | 39,247 psi | 62% | 2733 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 38,435 psi | 60% | 2694 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 96% | 46,151 psi | 72% | 2881 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 45,629 psi | 72% | 2772 fps | 95.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,860 psi | 70% | 2795 fps | 98.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,255 psi | 77% | 2822 fps | 98.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,035 psi | 42% | 1663 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,082 psi | 80% | 2864 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 48,631 psi | 76% | 2838 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,118 psi | 64% | 2795 fps | 96.8% |
| ReloadSwiss RS 60 | 50.7 gr | 80% | 34,200 psi | 54% | 2661 fps | 98% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 41,292 psi | 65% | 2805 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 44,324 psi | 69% | 2871 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 47,761 psi | 75% | 2779 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,524 psi | 65% | 2680 fps | 98.6% |
| Rottweil R 903 | <<locked>> | 80% | 35,027 psi | 55% | 2592 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 96% | 53,983 psi | 85% | 2917 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 43,816 psi | 69% | 2743 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,207 psi | 68% | 2756 fps | 99.7% |
| Shooters World Precision | <<locked>> | 80% | 39,494 psi | 62% | 2657 fps | 98.2% |
| Shooters World SW4350 | <<locked>> | 96% | 49,705 psi | 78% | 2874 fps | 95.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 53,766 psi | 84% | 2881 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,462 psi | 56% | 2628 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 53,592 psi | 84% | 2864 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,092 psi | 69% | 2746 fps | 96.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,279 psi | 66% | 2733 fps | 97.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,483 psi | 70% | 2680 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,072 psi | 58% | 2543 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 48,994 psi | 77% | 2792 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 49,342 psi | 77% | 2861 fps | 99.7% |
| Somchem S335 | <<locked>> | 80% | 44,266 psi | 69% | 2687 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,526 psi | 68% | 2746 fps | 97.8% |
| Somchem S355 | <<locked>> | 80% | 35,839 psi | 56% | 2598 fps | 96.4% |
| Somchem S365 | <<locked>> | 84% | 29,733 psi | 47% | 2523 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 49,937 psi | 78% | 2746 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,512 psi | 70% | 2677 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,509 psi | 63% | 2667 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,988 psi | 64% | 2667 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 33,939 psi | 53% | 2530 fps | 97.2% |
| Vihtavuori N160 | <<locked>> | 88% | 38,580 psi | 60% | 2680 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 45,948 psi | 72% | 2776 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 80% | 39,682 psi | 62% | 2657 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 90% | 40,480 psi | 63% | 2740 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 96% | 36,492 psi | 57% | 2723 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 34,171 psi | 54% | 2549 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 45,194 psi | 71% | 2818 fps | 99.6% |
| Winchester 760 | <<locked>> | 96% | 50,430 psi | 79% | 2953 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,756 psi | 65% | 2740 fps | 98.1% |
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 113 powders for .300 RCM loaded with the .308 | 150gr | Impala LWH CHP. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,120 fps; across all powders the maximum-charge window runs from 1,818 fps to 3,120 fps. Accurate 3100 gives the best case fill at 100 %, and 113 of the 113 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 150.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, ADI AR 2209 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, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for .300 RCM with the .308 | 150gr | Impala LWH CHP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.