Load Specifications
Bullet Manufacturer:Sierra
Bullet Weight:155 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 | 155gr | Sierra Palma MatchKing bullet and 104 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.
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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% | 55,216 psi | 87% | 2841 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 57,188 psi | 90% | 2917 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 56,927 psi | 89% | 2910 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,390 psi | 87% | 2930 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 56,826 psi | 89% | 2904 fps | 96.3% |
| Accurate 4064 | <<locked>> | 94% | 56,681 psi | 89% | 2953 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,518 psi | 82% | 2972 fps | 98.9% |
| Accurate LT-30 | <<locked>> | 82% | 57,464 psi | 90% | 2828 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 57,682 psi | 90% | 2989 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 94% | 55,259 psi | 87% | 2936 fps | 99.4% |
| ADI Benchmark 8208 | <<locked>> | 88% | 56,840 psi | 89% | 2943 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 57,261 psi | 90% | 2917 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 54,940 psi | 86% | 2999 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 57,464 psi | 90% | 3110 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 54,853 psi | 86% | 2956 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 54,824 psi | 86% | 2848 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 55,506 psi | 87% | 2976 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,894 psi | 80% | 2972 fps | 98.9% |
| Alliant Reloder-17 | <<locked>> | 98% | 55,550 psi | 87% | 3077 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,274 psi | 57% | 2690 fps | 96.8% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 56,652 psi | 89% | 2822 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 57,725 psi | 90% | 3005 fps | 99.5% |
| Bofors RP3 | <<locked>> | 94% | 55,535 psi | 87% | 2972 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 55,869 psi | 88% | 2933 fps | 96.4% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,317 psi | 87% | 2877 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 56,072 psi | 88% | 2972 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,331 psi | 85% | 3015 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 84% | 57,580 psi | 90% | 2940 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,085 psi | 86% | 2913 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 56,710 psi | 89% | 2982 fps | 99% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 55,767 psi | 87% | 3025 fps | 97.2% |
| Hodgdon H4350 | <<locked>> | 98% | 56,971 psi | 89% | 2992 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 88% | 54,781 psi | 86% | 2949 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,079 psi | 74% | 2851 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 57,725 psi | 90% | 3038 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 57,406 psi | 90% | 3068 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,143 psi | 55% | 1791 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,970 psi | 88% | 2949 fps | 99.9% |
| IMR 3031 | <<locked>> | 88% | 54,447 psi | 85% | 2936 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 54,708 psi | 86% | 2917 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,172 psi | 86% | 2897 fps | 96.9% |
| IMR 4198 | <<locked>> | 82% | 55,042 psi | 86% | 2808 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,489 psi | 82% | 2900 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,505 psi | 85% | 2917 fps | 96.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,777 psi | 78% | 2910 fps | 98.6% |
| IMR 4895 | <<locked>> | 92% | 56,898 psi | 89% | 3009 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 88% | 56,840 psi | 89% | 2943 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 57,217 psi | 90% | 2930 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 57,464 psi | 90% | 2966 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 57,348 psi | 90% | 2913 fps | 99.8% |
| Lovex S062 | <<locked>> | 92% | 54,360 psi | 85% | 2917 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 56,927 psi | 89% | 2959 fps | 98.4% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,404 psi | 85% | 2940 fps | 97% |
| Norma 201 | <<locked>> | 90% | 56,347 psi | 88% | 2933 fps | 100% |
| Norma 202 | <<locked>> | 90% | 56,869 psi | 89% | 2936 fps | 100% |
| Norma 203B | <<locked>> | 92% | 54,665 psi | 86% | 2963 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 52,011 psi | 82% | 2963 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 92% | 55,332 psi | 87% | 2992 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,821 psi | 80% | 2949 fps | 97.1% |
| Ramshot TAC | <<locked>> | 88% | 57,348 psi | 90% | 2959 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 88% | 56,811 psi | 89% | 2979 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,360 psi | 85% | 2890 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,563 psi | 56% | 1834 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 56,521 psi | 89% | 2927 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 57,290 psi | 90% | 2966 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 55,970 psi | 88% | 3048 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,637 psi | 87% | 3084 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,330 psi | 82% | 2995 fps | 98.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,547 psi | 82% | 3015 fps | 98.3% |
| Rottweil R 901 | <<locked>> | 88% | 57,319 psi | 90% | 2917 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 56,768 psi | 89% | 2930 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,376 psi | 87% | 2963 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 98% | 55,869 psi | 88% | 2933 fps | 96.4% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 56,927 psi | 89% | 2959 fps | 98.4% |
| Shooters World Match Rifle | <<locked>> | 90% | 57,464 psi | 90% | 2966 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,360 psi | 85% | 2917 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,404 psi | 85% | 2940 fps | 97% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 56,101 psi | 88% | 2894 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 57,159 psi | 90% | 3025 fps | 99.8% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 55,695 psi | 87% | 2871 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 55,564 psi | 87% | 2933 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 56,115 psi | 88% | 2959 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 54,868 psi | 86% | 2828 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 54,607 psi | 86% | 2822 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 53,896 psi | 84% | 2854 fps | 96.6% |
| Somchem S321 | <<locked>> | 84% | 54,694 psi | 86% | 2927 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 57,319 psi | 90% | 2871 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,158 psi | 86% | 2927 fps | 99.7% |
| Somchem S355 | <<locked>> | 96% | 55,637 psi | 87% | 2959 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,354 psi | 73% | 2910 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 54,694 psi | 86% | 2795 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 54,969 psi | 86% | 2815 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 56,391 psi | 88% | 2897 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 57,363 psi | 90% | 2913 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 57,435 psi | 90% | 2940 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 54,491 psi | 85% | 2959 fps | 99% |
| Vihtavuori N530 | <<locked>> | 88% | 57,537 psi | 90% | 2943 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 55,738 psi | 87% | 2913 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,737 psi | 84% | 2966 fps | 98.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,986 psi | 61% | 2769 fps | 96.8% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,492 psi | 87% | 2943 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 57,159 psi | 90% | 2992 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 56,072 psi | 88% | 3028 fps | 97.2% |
| Winchester StaBALL Match | <<locked>> | 90% | 55,970 psi | 88% | 2969 fps | 99.9% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 45,876 psi | 72% | 2703 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,212 psi | 79% | 2815 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,348 psi | 60% | 2615 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,281 psi | 71% | 2769 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 53,113 psi | 83% | 2844 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 36,274 psi | 57% | 2602 fps | 99.7% |
| Accurate 4350 | <<locked>> | 90% | 37,072 psi | 58% | 2680 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 53,983 psi | 85% | 2782 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 42,148 psi | 66% | 2720 fps | 98% |
| ADI AR 2208 | <<locked>> | 80% | 35,926 psi | 56% | 2562 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,193 psi | 69% | 2730 fps | 99.3% |
| Alliant AR-Comp | <<locked>> | 80% | 43,990 psi | 69% | 2726 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 51,503 psi | 81% | 2940 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 38,145 psi | 60% | 2733 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,273 psi | 55% | 2582 fps | 97.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,416 psi | 81% | 2799 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,942 psi | 59% | 2648 fps | 96.4% |
| Alliant Reloder-16 | <<locked>> | 90% | 37,536 psi | 59% | 2694 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 82% | 32,590 psi | 51% | 2592 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 98% | 34,113 psi | 53% | 2635 fps | 95.9% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 53,214 psi | 83% | 2776 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,176 psi | 65% | 2713 fps | 96.8% |
| Bofors RP3 | <<locked>> | 80% | 34,693 psi | 54% | 2582 fps | 97.1% |
| Bofors RP7 | <<locked>> | 94% | 49,313 psi | 77% | 2825 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,166 psi | 72% | 2726 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,786 psi | 67% | 2749 fps | 99.4% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,021 psi | 74% | 2890 fps | 98.6% |
| Hodgdon H322 | <<locked>> | 80% | 50,662 psi | 79% | 2838 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,517 psi | 81% | 2861 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 38,145 psi | 60% | 2641 fps | 95% |
| Hodgdon H414 | <<locked>> | 96% | 48,863 psi | 77% | 2907 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 96% | 53,316 psi | 84% | 2930 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 42,482 psi | 67% | 2730 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 32,184 psi | 50% | 2530 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,421 psi | 60% | 2694 fps | 98.1% |
| Hodgdon Superformance | <<locked>> | 96% | 49,632 psi | 78% | 2936 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,179 psi | 41% | 1601 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,741 psi | 64% | 2680 fps | 98.2% |
| IMR 3031 | <<locked>> | 80% | 41,945 psi | 66% | 2736 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,695 psi | 59% | 2598 fps | 96.4% |
| IMR 4166 Enduron | <<locked>> | 86% | 48,559 psi | 76% | 2785 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 51,880 psi | 81% | 2762 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 49,298 psi | 77% | 2844 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 92% | 48,283 psi | 76% | 2808 fps | 95.3% |
| IMR 4831 | <<locked>> | 90% | 35,969 psi | 56% | 2635 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 38,827 psi | 61% | 2680 fps | 97.3% |
| IMR 8208 XBR | <<locked>> | 80% | 44,193 psi | 69% | 2730 fps | 99.3% |
| Lovex D073.5 | <<locked>> | 80% | 49,995 psi | 78% | 2822 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,017 psi | 64% | 2700 fps | 99.7% |
| Lovex S060 | <<locked>> | 80% | 42,525 psi | 67% | 2661 fps | 98.1% |
| Lovex S062 | <<locked>> | 80% | 37,521 psi | 59% | 2605 fps | 98.2% |
| Lovex S065 | <<locked>> | 90% | 41,858 psi | 66% | 2694 fps | 95.2% |
| Lovex S070 | <<locked>> | 96% | 48,051 psi | 75% | 2831 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 41,249 psi | 65% | 2671 fps | 98.9% |
| Norma 202 | <<locked>> | 80% | 41,495 psi | 65% | 2687 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 37,304 psi | 58% | 2635 fps | 96.8% |
| Norma URP | <<locked>> | 90% | 37,478 psi | 59% | 2680 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 36,767 psi | 58% | 2644 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 96% | 44,715 psi | 70% | 2835 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 44,063 psi | 69% | 2726 fps | 96% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,555 psi | 68% | 2753 fps | 98.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,761 psi | 75% | 2779 fps | 98.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,411 psi | 41% | 1640 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,647 psi | 78% | 2822 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 44,150 psi | 69% | 2740 fps | 95% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,479 psi | 62% | 2746 fps | 96.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 32,416 psi | 51% | 2605 fps | 97.9% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 39,508 psi | 62% | 2753 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 42,844 psi | 67% | 2828 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 45,324 psi | 71% | 2726 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,436 psi | 62% | 2628 fps | 98.5% |
| Rottweil R 903 | <<locked>> | 80% | 32,750 psi | 51% | 2526 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 94% | 49,313 psi | 77% | 2825 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 90% | 41,858 psi | 66% | 2694 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,017 psi | 64% | 2700 fps | 99.7% |
| Shooters World Precision | <<locked>> | 80% | 37,521 psi | 59% | 2605 fps | 98.2% |
| Shooters World SW4350 | <<locked>> | 96% | 48,051 psi | 75% | 2831 fps | 95.7% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,417 psi | 82% | 2838 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,707 psi | 53% | 2572 fps | 95.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,504 psi | 82% | 2825 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,366 psi | 66% | 2703 fps | 96.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,698 psi | 64% | 2687 fps | 97.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,917 psi | 67% | 2638 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,534 psi | 56% | 2500 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 47,384 psi | 74% | 2749 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 47,645 psi | 75% | 2812 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 42,264 psi | 66% | 2635 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,916 psi | 66% | 2700 fps | 97.9% |
| Somchem S355 | <<locked>> | 80% | 33,605 psi | 53% | 2533 fps | 96.1% |
| Somchem S365 | <<locked>> | 86% | 29,486 psi | 46% | 2513 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 48,501 psi | 76% | 2707 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,149 psi | 68% | 2635 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,667 psi | 61% | 2618 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,334 psi | 62% | 2621 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 32,010 psi | 50% | 2474 fps | 97.1% |
| Vihtavuori N160 | <<locked>> | 88% | 36,854 psi | 58% | 2628 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 44,135 psi | 69% | 2726 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 80% | 37,884 psi | 59% | 2605 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 90% | 38,595 psi | 60% | 2687 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 96% | 34,258 psi | 54% | 2657 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 32,590 psi | 51% | 2497 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 43,627 psi | 68% | 2772 fps | 99.7% |
| Winchester 760 | <<locked>> | 96% | 49,066 psi | 77% | 2910 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,089 psi | 63% | 2690 fps | 98.1% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 104 powders for .300 RCM loaded with the .308 | 155gr | Sierra Palma MatchKing. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,110 fps; across all powders the maximum-charge window runs from 1,791 fps to 3,110 fps. Accurate 4350 gives the best case fill at 100 %, and 104 of the 104 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 155.0 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.