Load Specifications
Bullet:.308 | 150gr | Barnes X S
Bullet Manufacturer:Barnes
Bullet Weight:150 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 | 150gr | Barnes X S bullet and 98 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% | 57,217 psi | 90% | 2890 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,695 psi | 87% | 2917 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 56,536 psi | 89% | 2923 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 57,493 psi | 90% | 2979 fps | 100% |
| Accurate 4064 | <<locked>> | 92% | 56,159 psi | 88% | 2966 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 54,505 psi | 85% | 3022 fps | 98.8% |
| ADI AR 2206H | <<locked>> | 88% | 55,883 psi | 88% | 2986 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 94% | 56,318 psi | 88% | 2972 fps | 99.3% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,592 psi | 86% | 2933 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 86% | 55,129 psi | 86% | 2917 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 56,449 psi | 88% | 3041 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,737 psi | 86% | 3087 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 56,507 psi | 89% | 3002 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 82% | 56,507 psi | 89% | 2894 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 57,174 psi | 90% | 3022 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,141 psi | 82% | 3015 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 98% | 56,797 psi | 89% | 3117 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,101 psi | 60% | 2746 fps | 96.8% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,216 psi | 87% | 2989 fps | 99% |
| Bofors RP3 | <<locked>> | 94% | 57,406 psi | 90% | 3022 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 57,392 psi | 90% | 2976 fps | 96.2% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,681 psi | 89% | 2920 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 57,580 psi | 90% | 3018 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,390 psi | 87% | 3054 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 82% | 55,332 psi | 87% | 2933 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 56,333 psi | 88% | 2956 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,911 psi | 86% | 2976 fps | 98.4% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 57,072 psi | 89% | 3064 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 88% | 56,420 psi | 88% | 2995 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,501 psi | 76% | 2894 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,172 psi | 86% | 3022 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,636 psi | 56% | 1818 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 57,261 psi | 90% | 2992 fps | 99.9% |
| IMR 3031 | <<locked>> | 88% | 55,999 psi | 88% | 2986 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,941 psi | 88% | 2959 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 90% | 56,304 psi | 88% | 2933 fps | 96.6% |
| IMR 4198 | <<locked>> | 82% | 55,927 psi | 88% | 2848 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,579 psi | 87% | 2953 fps | 96.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,459 psi | 81% | 2956 fps | 98.4% |
| IMR 4895 | <<locked>> | 90% | 55,245 psi | 87% | 3005 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 86% | 54,592 psi | 86% | 2933 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 82% | 55,448 psi | 87% | 2923 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,782 psi | 87% | 2966 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,332 psi | 87% | 2907 fps | 99.6% |
| Lovex S062 | <<locked>> | 92% | 56,260 psi | 88% | 2963 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,216 psi | 87% | 2949 fps | 97.7% |
| Lovex S070ᴾ | <<locked>> | 100% | 56,115 psi | 88% | 2986 fps | 96.8% |
| Norma 201 | <<locked>> | 88% | 55,027 psi | 86% | 2933 fps | 99.9% |
| Norma 202 | <<locked>> | 88% | 55,100 psi | 86% | 2936 fps | 100% |
| Norma 203B | <<locked>> | 92% | 56,405 psi | 88% | 3012 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 53,388 psi | 84% | 3009 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 92% | 56,536 psi | 89% | 3031 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,301 psi | 82% | 2995 fps | 96.8% |
| Ramshot TAC | <<locked>> | 86% | 55,042 psi | 86% | 2943 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,447 psi | 85% | 2966 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,869 psi | 88% | 2933 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,158 psi | 57% | 1860 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 57,682 psi | 90% | 2966 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 54,984 psi | 86% | 2949 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 57,159 psi | 90% | 3087 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 56,536 psi | 89% | 3123 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 53,693 psi | 84% | 3038 fps | 98.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,954 psi | 85% | 3058 fps | 98.1% |
| Rottweil R 901 | <<locked>> | 86% | 56,478 psi | 89% | 2923 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 55,463 psi | 87% | 2930 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 96% | 57,261 psi | 90% | 3012 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 98% | 57,392 psi | 90% | 2976 fps | 96.2% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,216 psi | 87% | 2949 fps | 97.7% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,782 psi | 87% | 2966 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 56,260 psi | 88% | 2963 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 56,115 psi | 88% | 2986 fps | 96.8% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 57,566 psi | 90% | 2936 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,708 psi | 86% | 3012 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,898 psi | 89% | 2910 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 57,217 psi | 90% | 2979 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 57,290 psi | 90% | 2999 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 56,376 psi | 88% | 2874 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 56,028 psi | 88% | 2864 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,579 psi | 87% | 2897 fps | 96.4% |
| Somchem S321 | <<locked>> | 84% | 56,130 psi | 88% | 2969 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,767 psi | 87% | 2871 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 56,405 psi | 88% | 2969 fps | 99.6% |
| Somchem S355 | <<locked>> | 96% | 57,276 psi | 90% | 3005 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,051 psi | 75% | 2959 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 56,115 psi | 88% | 2838 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 56,333 psi | 88% | 2858 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 54,636 psi | 86% | 2897 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,477 psi | 87% | 2913 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,390 psi | 87% | 2936 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,782 psi | 87% | 3002 fps | 98.8% |
| Vihtavuori N530 | <<locked>> | 86% | 55,230 psi | 87% | 2933 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 92% | 57,087 psi | 89% | 2956 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,998 psi | 86% | 3009 fps | 98.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,031 psi | 64% | 2828 fps | 96.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 56,521 psi | 89% | 2982 fps | 99.9% |
| Winchester 748 | <<locked>> | 86% | 54,839 psi | 86% | 2982 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 57,334 psi | 90% | 3071 fps | 97% |
| Winchester StaBALL Match | <<locked>> | 90% | 57,276 psi | 90% | 3009 fps | 99.9% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 47,964 psi | 75% | 2753 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,243 psi | 82% | 2864 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,872 psi | 66% | 2690 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,253 psi | 74% | 2818 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 39,523 psi | 62% | 2677 fps | 99.8% |
| Accurate 4350 | <<locked>> | 90% | 39,494 psi | 62% | 2746 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 43,918 psi | 69% | 2769 fps | 98% |
| ADI AR 2208 | <<locked>> | 80% | 37,507 psi | 59% | 2615 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,730 psi | 72% | 2779 fps | 99.2% |
| Alliant AR-Comp | <<locked>> | 80% | 45,629 psi | 72% | 2776 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 53,098 psi | 83% | 2989 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 39,755 psi | 62% | 2782 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,159 psi | 58% | 2641 fps | 97.3% |
| Alliant Reloder-10x | <<locked>> | 80% | 53,388 psi | 84% | 2848 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,856 psi | 62% | 2700 fps | 96.5% |
| Alliant Reloder-16 | <<locked>> | 90% | 39,030 psi | 61% | 2740 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 82% | 34,272 psi | 54% | 2648 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 96% | 34,040 psi | 53% | 2638 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,786 psi | 67% | 2766 fps | 96.7% |
| Bofors RP3 | <<locked>> | 80% | 37,086 psi | 58% | 2648 fps | 97.4% |
| Bofors RP7 | <<locked>> | 96% | 54,085 psi | 85% | 2920 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,616 psi | 75% | 2769 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,744 psi | 70% | 2802 fps | 99.4% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,486 psi | 76% | 2940 fps | 98.5% |
| Hodgdon H322 | <<locked>> | 80% | 51,967 psi | 81% | 2884 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,794 psi | 83% | 2904 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 40,263 psi | 63% | 2697 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 96% | 50,227 psi | 79% | 2949 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 44,280 psi | 69% | 2782 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 34,113 psi | 53% | 2585 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,147 psi | 63% | 2749 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,629 psi | 42% | 1624 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,409 psi | 66% | 2730 fps | 98.1% |
| IMR 3031 | <<locked>> | 80% | 43,729 psi | 69% | 2785 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,378 psi | 62% | 2648 fps | 96.4% |
| IMR 4166 Enduron | <<locked>> | 86% | 50,053 psi | 78% | 2825 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 52,779 psi | 83% | 2802 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 52,460 psi | 82% | 2900 fps | 95.7% |
| IMR 4831 | <<locked>> | 90% | 37,884 psi | 59% | 2690 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 40,727 psi | 64% | 2733 fps | 97.4% |
| IMR 8208 XBR | <<locked>> | 80% | 45,730 psi | 72% | 2779 fps | 99.2% |
| Lovex D073.5 | <<locked>> | 80% | 52,011 psi | 82% | 2871 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,250 psi | 68% | 2756 fps | 99.7% |
| Lovex S060 | <<locked>> | 80% | 43,976 psi | 69% | 2703 fps | 98% |
| Lovex S062 | <<locked>> | 80% | 39,639 psi | 62% | 2661 fps | 98.2% |
| Lovex S065 | <<locked>> | 90% | 43,888 psi | 69% | 2746 fps | 95.2% |
| Lovex S070 | <<locked>> | 96% | 49,792 psi | 78% | 2877 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 43,627 psi | 68% | 2733 fps | 99% |
| Norma 202 | <<locked>> | 80% | 43,352 psi | 68% | 2736 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 39,262 psi | 62% | 2690 fps | 96.9% |
| Norma URP | <<locked>> | 90% | 39,349 psi | 62% | 2736 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 38,551 psi | 60% | 2697 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 96% | 46,224 psi | 72% | 2881 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 45,701 psi | 72% | 2776 fps | 95.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,976 psi | 70% | 2799 fps | 98.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,371 psi | 77% | 2825 fps | 98.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,992 psi | 42% | 1663 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,126 psi | 80% | 2867 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 48,733 psi | 76% | 2841 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,249 psi | 65% | 2799 fps | 96.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,229 psi | 54% | 2664 fps | 98.1% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 41,379 psi | 65% | 2808 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 44,440 psi | 70% | 2874 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 47,834 psi | 75% | 2782 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,640 psi | 65% | 2684 fps | 98.6% |
| Rottweil R 903 | <<locked>> | 80% | 35,128 psi | 55% | 2595 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 96% | 54,085 psi | 85% | 2920 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 90% | 43,888 psi | 69% | 2746 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,250 psi | 68% | 2756 fps | 99.7% |
| Shooters World Precision | <<locked>> | 80% | 39,639 psi | 62% | 2661 fps | 98.2% |
| Shooters World SW4350 | <<locked>> | 96% | 49,792 psi | 78% | 2877 fps | 95.5% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 53,896 psi | 84% | 2881 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,491 psi | 56% | 2631 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 53,722 psi | 84% | 2867 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,208 psi | 69% | 2753 fps | 96.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,322 psi | 66% | 2736 fps | 97.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,556 psi | 70% | 2684 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,173 psi | 58% | 2546 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 49,110 psi | 77% | 2792 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 49,472 psi | 78% | 2861 fps | 99.7% |
| Somchem S335 | <<locked>> | 80% | 44,411 psi | 70% | 2690 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,642 psi | 68% | 2749 fps | 97.9% |
| Somchem S355 | <<locked>> | 80% | 35,940 psi | 56% | 2598 fps | 96.4% |
| Somchem S365 | <<locked>> | 84% | 29,820 psi | 47% | 2526 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 50,024 psi | 78% | 2749 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,614 psi | 70% | 2680 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,669 psi | 64% | 2671 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,118 psi | 64% | 2671 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 33,997 psi | 53% | 2533 fps | 97.3% |
| Vihtavuori N160 | <<locked>> | 88% | 38,682 psi | 61% | 2684 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 45,788 psi | 72% | 2772 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 80% | 39,769 psi | 62% | 2661 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 90% | 40,393 psi | 63% | 2740 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 96% | 36,579 psi | 57% | 2726 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 34,243 psi | 54% | 2549 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 45,237 psi | 71% | 2822 fps | 99.6% |
| Winchester 760 | <<locked>> | 96% | 50,517 psi | 79% | 2956 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,611 psi | 65% | 2736 fps | 98.1% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 98 powders for .300 RCM loaded with the .308 | 150gr | Barnes X S. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,123 fps; across all powders the maximum-charge window runs from 1,818 fps to 3,123 fps. Accurate 4350 gives the best case fill at 100 %, and 98 of the 98 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 150.0 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.