Load Specifications
Load data in caliber .300 RCM with .308 | 152gr | Lehigh Defense Controlled Chaos 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 Power Pro 2000-MR, ReloadSwiss RS 60 and ReloadSwiss RS 52.
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>> | 88% | 56,608 psi | 89% | 2881 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 55,129 psi | 86% | 2907 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 54,273 psi | 85% | 2894 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 56,884 psi | 89% | 2966 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 54,201 psi | 85% | 2940 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 49,850 psi | 78% | 2943 fps | 98.2% |
| Accurate LT-30 | <<locked>> | 82% | 55,738 psi | 87% | 2822 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 56,130 psi | 88% | 2848 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 55,419 psi | 87% | 2972 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 96% | 56,391 psi | 88% | 2966 fps | 99.3% |
| ADI AR 2219 | <<locked>> | 82% | 56,913 psi | 89% | 2949 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 54,607 psi | 86% | 2927 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 88% | 54,737 psi | 86% | 2907 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 56,521 psi | 89% | 3038 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 55,042 psi | 86% | 3084 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 56,072 psi | 88% | 2989 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 84% | 56,130 psi | 88% | 2884 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 56,782 psi | 89% | 3012 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 48,747 psi | 76% | 2946 fps | 98.2% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 56,811 psi | 89% | 3110 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 54,955 psi | 86% | 2815 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 55,317 psi | 87% | 2982 fps | 99% |
| Bofors RP3 | <<locked>> | 96% | 56,550 psi | 89% | 3005 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 57,145 psi | 90% | 2963 fps | 96.2% |
| Hodgdon Benchmark | <<locked>> | 88% | 56,594 psi | 89% | 2910 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 57,421 psi | 90% | 3009 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 55,680 psi | 87% | 3054 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 84% | 55,376 psi | 87% | 2927 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 56,594 psi | 89% | 2953 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 54,259 psi | 85% | 2959 fps | 98.4% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 53,113 psi | 83% | 2995 fps | 96.2% |
| Hodgdon H4895 | <<locked>> | 90% | 55,985 psi | 88% | 2982 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 45,136 psi | 71% | 2828 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 55,071 psi | 86% | 3015 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,983 psi | 55% | 1795 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 57,334 psi | 90% | 2986 fps | 99.9% |
| IMR 3031 | <<locked>> | 90% | 55,477 psi | 87% | 2972 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 56,043 psi | 88% | 2953 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 92% | 56,637 psi | 89% | 2930 fps | 96.7% |
| IMR 4198 | <<locked>> | 84% | 56,362 psi | 88% | 2844 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 55,724 psi | 87% | 2943 fps | 96.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 47,369 psi | 74% | 2881 fps | 97.8% |
| IMR 4895 | <<locked>> | 92% | 54,636 psi | 86% | 2989 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 88% | 54,607 psi | 86% | 2927 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 84% | 54,940 psi | 86% | 2913 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 54,998 psi | 86% | 2953 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 55,535 psi | 87% | 2900 fps | 99.6% |
| Lovex S062 | <<locked>> | 94% | 55,535 psi | 87% | 2949 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 54,650 psi | 86% | 2936 fps | 97.7% |
| Lovex S070ᴾ | <<locked>> | 100% | 51,866 psi | 81% | 2910 fps | 96.1% |
| Norma 201 | <<locked>> | 92% | 57,580 psi | 90% | 2966 fps | 100% |
| Norma 202 | <<locked>> | 90% | 54,810 psi | 86% | 2927 fps | 100% |
| Norma 203B | <<locked>> | 94% | 55,898 psi | 88% | 2999 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 49,327 psi | 77% | 2933 fps | 98% |
| Ramshot Big Game | <<locked>> | 94% | 56,695 psi | 89% | 3025 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 48,559 psi | 76% | 2923 fps | 96.1% |
| Ramshot TAC | <<locked>> | 88% | 55,114 psi | 86% | 2936 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 88% | 54,418 psi | 85% | 2959 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 86% | 55,941 psi | 88% | 2927 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,375 psi | 55% | 1837 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 54,244 psi | 85% | 2910 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 55,027 psi | 86% | 2943 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 57,145 psi | 90% | 3081 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 56,826 psi | 89% | 3117 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 49,356 psi | 77% | 2959 fps | 97.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 50,314 psi | 79% | 2986 fps | 97.4% |
| Rottweil R 901 | <<locked>> | 88% | 55,274 psi | 87% | 2904 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 54,781 psi | 86% | 2917 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 98% | 56,391 psi | 88% | 2995 fps | 99.9% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 57,145 psi | 90% | 2963 fps | 96.2% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 54,650 psi | 86% | 2936 fps | 97.7% |
| Shooters World Match Rifle | <<locked>> | 90% | 54,998 psi | 86% | 2953 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 55,535 psi | 87% | 2949 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 51,866 psi | 81% | 2910 fps | 96.1% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 54,186 psi | 85% | 2881 fps | 99.8% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 57,087 psi | 89% | 2956 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 54,723 psi | 86% | 3005 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 57,043 psi | 89% | 2907 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 57,029 psi | 89% | 2969 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 57,450 psi | 90% | 2995 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 56,188 psi | 88% | 2864 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 56,028 psi | 88% | 2858 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 55,245 psi | 87% | 2887 fps | 96.4% |
| Somchem S321 | <<locked>> | 86% | 56,231 psi | 88% | 2966 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 55,448 psi | 87% | 2861 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 56,492 psi | 89% | 2963 fps | 99.6% |
| Somchem S355 | <<locked>> | 98% | 56,666 psi | 89% | 2989 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 44,150 psi | 69% | 2884 fps | 99.6% |
| Vihtavuori N130 | <<locked>> | 86% | 56,072 psi | 88% | 2831 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 56,188 psi | 88% | 2848 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 57,493 psi | 90% | 2933 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 55,100 psi | 86% | 2900 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 54,969 psi | 86% | 2923 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 52,083 psi | 82% | 2936 fps | 98.3% |
| Vihtavuori N530 | <<locked>> | 88% | 55,230 psi | 87% | 2927 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 56,840 psi | 89% | 2946 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 51,140 psi | 80% | 2940 fps | 98.1% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 53,011 psi | 83% | 2920 fps | 99.7% |
| Winchester 748 | <<locked>> | 88% | 54,810 psi | 86% | 2976 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 53,417 psi | 84% | 2999 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 92% | 57,334 psi | 90% | 3005 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% | 44,121 psi | 69% | 2690 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 48,196 psi | 76% | 2799 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 36,593 psi | 57% | 2598 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 43,323 psi | 68% | 2749 fps | 99.8% |
| Accurate 4064 | <<locked>> | 80% | 34,606 psi | 54% | 2582 fps | 99.2% |
| Accurate 4350 | <<locked>> | 92% | 37,623 psi | 59% | 2707 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 52,315 psi | 82% | 2772 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 52,678 psi | 83% | 2799 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 40,596 psi | 64% | 2700 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 82% | 36,651 psi | 57% | 2595 fps | 95.3% |
| ADI AR 2219 | <<locked>> | 80% | 52,982 psi | 83% | 2894 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,598 psi | 67% | 2717 fps | 98.8% |
| Alliant AR-Comp | <<locked>> | 80% | 41,974 psi | 66% | 2717 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 49,501 psi | 78% | 2923 fps | 99.4% |
| Alliant Power Pro 2000-MR | 52.1 gr | 82% | 39,276 psi | 62% | 2769 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,750 psi | 53% | 2559 fps | 96.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 49,806 psi | 78% | 2792 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,405 psi | 57% | 2625 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 92% | 38,247 psi | 60% | 2720 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 84% | 33,272 psi | 52% | 2621 fps | 95.1% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 51,532 psi | 81% | 2769 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,479 psi | 62% | 2694 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 33,156 psi | 52% | 2559 fps | 96.2% |
| Bofors RP7 | <<locked>> | 98% | 53,592 psi | 84% | 2907 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,396 psi | 70% | 2710 fps | 99.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,988 psi | 64% | 2730 fps | 99% |
| Hodgdon CFE223 | <<locked>> | 80% | 45,005 psi | 71% | 2867 fps | 97.9% |
| Hodgdon H322 | <<locked>> | 80% | 48,501 psi | 76% | 2822 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 49,313 psi | 77% | 2844 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 41,829 psi | 66% | 2733 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 98% | 49,719 psi | 78% | 2936 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 40,901 psi | 64% | 2710 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 32,880 psi | 52% | 2559 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,709 psi | 58% | 2671 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,034 psi | 41% | 1604 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,247 psi | 62% | 2661 fps | 97.5% |
| IMR 3031 | <<locked>> | 80% | 40,103 psi | 63% | 2720 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,216 psi | 57% | 2579 fps | 95.5% |
| IMR 4166 Enduron | <<locked>> | 88% | 49,980 psi | 78% | 2818 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 50,212 psi | 79% | 2756 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 49,182 psi | 77% | 2835 fps | 95% |
| IMR 4831 | <<locked>> | 94% | 39,030 psi | 61% | 2720 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 37,275 psi | 58% | 2657 fps | 96.5% |
| IMR 8208 XBR | <<locked>> | 80% | 42,598 psi | 67% | 2717 fps | 98.8% |
| Lovex D073.5 | <<locked>> | 80% | 47,761 psi | 75% | 2799 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 39,088 psi | 61% | 2677 fps | 99.3% |
| Lovex S060 | <<locked>> | 80% | 41,075 psi | 64% | 2644 fps | 97.5% |
| Lovex S062 | <<locked>> | 80% | 35,998 psi | 56% | 2585 fps | 97.4% |
| Lovex S065 | <<locked>> | 94% | 45,440 psi | 71% | 2776 fps | 95.7% |
| Lovex S070 | <<locked>> | 98% | 48,878 psi | 77% | 2858 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 39,653 psi | 62% | 2654 fps | 98.3% |
| Norma 202 | <<locked>> | 80% | 39,885 psi | 63% | 2671 fps | 99.7% |
| Norma 203B | <<locked>> | 80% | 35,810 psi | 56% | 2615 fps | 95.9% |
| Norma URP | <<locked>> | 92% | 38,087 psi | 60% | 2707 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 35,230 psi | 55% | 2621 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 98% | 45,542 psi | 71% | 2864 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 42,482 psi | 67% | 2707 fps | 95.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,611 psi | 65% | 2726 fps | 97.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,093 psi | 72% | 2762 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,266 psi | 41% | 1644 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 47,703 psi | 75% | 2805 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 48,283 psi | 76% | 2828 fps | 95.6% |
| ReloadSwiss RS 52 | 49.2 gr | 80% | 37,565 psi | 59% | 2717 fps | 95.8% |
| ReloadSwiss RS 60 | 50 gr | 80% | 31,038 psi | 49% | 2572 fps | 96.8% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 40,263 psi | 63% | 2782 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 43,772 psi | 69% | 2858 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 43,613 psi | 68% | 2710 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 37,884 psi | 59% | 2605 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 80% | 31,241 psi | 49% | 2503 fps | 95% |
| Rottweil R 907 | <<locked>> | 98% | 53,592 psi | 84% | 2907 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 94% | 45,440 psi | 71% | 2776 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,088 psi | 61% | 2677 fps | 99.3% |
| Shooters World Precision | <<locked>> | 80% | 35,998 psi | 56% | 2585 fps | 97.4% |
| Shooters World SW4350 | <<locked>> | 98% | 48,878 psi | 77% | 2858 fps | 95.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 50,546 psi | 79% | 2822 fps | 99.6% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 53,330 psi | 84% | 2904 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 34,548 psi | 54% | 2608 fps | 95.2% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 50,546 psi | 79% | 2812 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 40,451 psi | 63% | 2674 fps | 95.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,986 psi | 61% | 2664 fps | 96.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,350 psi | 65% | 2621 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,084 psi | 53% | 2480 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 51,663 psi | 81% | 2831 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 45,803 psi | 72% | 2795 fps | 99.4% |
| Somchem S335 | <<locked>> | 80% | 40,741 psi | 64% | 2621 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 40,248 psi | 63% | 2680 fps | 97.1% |
| Somchem S355 | <<locked>> | 80% | 32,155 psi | 50% | 2510 fps | 95.1% |
| Somchem S365 | <<locked>> | 88% | 30,066 psi | 47% | 2543 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 46,760 psi | 73% | 2697 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,495 psi | 65% | 2621 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,927 psi | 58% | 2602 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,797 psi | 59% | 2605 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 80% | 30,647 psi | 48% | 2454 fps | 96.2% |
| Vihtavuori N160 | <<locked>> | 92% | 40,016 psi | 63% | 2713 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 42,569 psi | 67% | 2710 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 80% | 36,260 psi | 57% | 2585 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 92% | 39,276 psi | 62% | 2713 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 33,417 psi | 52% | 2530 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 41,713 psi | 65% | 2749 fps | 99.3% |
| Winchester 760 | <<locked>> | 98% | 50,009 psi | 78% | 2940 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,377 psi | 60% | 2667 fps | 97.4% |
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 112 powders for .300 RCM loaded with the .308 | 152gr | Lehigh Defense Controlled Chaos. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,117 fps; across all powders the maximum-charge window runs from 1,795 fps to 3,117 fps. Accurate 3100 gives the best case fill at 100 %, and 112 of the 112 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 48–90 %, leaving at least 10 % headroom. The 152.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, Alliant Reloder-16 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, ReloadSwiss RS 52 rank at the top here: for .300 RCM with the .308 | 152gr | Lehigh Defense Controlled Chaos they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, Alliant Reloder-26, Hodgdon H4350 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.