Load Specifications
Bullet Manufacturer:Norma
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:1:12.5
Load data in caliber .300 RCM with .308 | 155gr | Norma Kalahari bullet and 103 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Power Pro 2000-MR 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.
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>> | 88% | 57,740 psi | 90% | 2871 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 56,246 psi | 88% | 2897 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 55,854 psi | 88% | 2890 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 54,462 psi | 85% | 2910 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 55,825 psi | 87% | 2877 fps | 95.9% |
| Accurate 4064 | <<locked>> | 94% | 55,709 psi | 87% | 2936 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 51,430 psi | 81% | 2946 fps | 98.6% |
| Accurate LT-30 | <<locked>> | 82% | 56,768 psi | 89% | 2812 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 57,188 psi | 90% | 2841 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 56,797 psi | 89% | 2969 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 96% | 57,740 psi | 90% | 2963 fps | 99.6% |
| ADI Benchmark 8208 | <<locked>> | 88% | 55,956 psi | 88% | 2923 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 56,405 psi | 88% | 2900 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 54,128 psi | 85% | 2976 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 56,405 psi | 88% | 3084 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 57,537 psi | 90% | 2989 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 57,276 psi | 90% | 2874 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 54,679 psi | 86% | 2956 fps | 99.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 49,995 psi | 78% | 2949 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 98% | 54,621 psi | 86% | 3054 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,563 psi | 56% | 2664 fps | 96.4% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 55,869 psi | 88% | 2805 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 56,666 psi | 89% | 2982 fps | 99.3% |
| Bofors RP3 | <<locked>> | 94% | 54,404 psi | 85% | 2949 fps | 99.9% |
| Bofors RP7 | <<locked>> | 98% | 54,853 psi | 86% | 2907 fps | 96.1% |
| Hodgdon Benchmark | <<locked>> | 86% | 54,476 psi | 85% | 2858 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 55,274 psi | 87% | 2953 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 57,246 psi | 90% | 3054 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 84% | 56,521 psi | 89% | 2917 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 54,172 psi | 85% | 2897 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 55,680 psi | 87% | 2959 fps | 98.8% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 54,766 psi | 86% | 3002 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 90% | 57,348 psi | 90% | 2979 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 46,383 psi | 73% | 2831 fps | 99.1% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 56,565 psi | 89% | 3012 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 56,333 psi | 88% | 3041 fps | 96.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,157 psi | 55% | 1785 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,143 psi | 86% | 2930 fps | 99.8% |
| IMR 3031 | <<locked>> | 90% | 57,058 psi | 89% | 2966 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 57,435 psi | 90% | 2949 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 92% | 57,595 psi | 90% | 2927 fps | 97.2% |
| IMR 4198 | <<locked>> | 84% | 57,493 psi | 90% | 2835 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 56,956 psi | 89% | 2943 fps | 97% |
| IMR 4831ᴾ | <<locked>> | 100% | 48,791 psi | 76% | 2884 fps | 98.3% |
| IMR 4895 | <<locked>> | 92% | 56,043 psi | 88% | 2989 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 88% | 55,956 psi | 88% | 2923 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 56,333 psi | 88% | 2910 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 56,536 psi | 89% | 2946 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 56,507 psi | 89% | 2894 fps | 99.8% |
| Lovex S062 | <<locked>> | 94% | 56,942 psi | 89% | 2946 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 55,941 psi | 88% | 2936 fps | 98.1% |
| Lovex S070ᴾ | <<locked>> | 100% | 53,447 psi | 84% | 2917 fps | 96.7% |
| Norma 201 | <<locked>> | 90% | 55,434 psi | 87% | 2913 fps | 100% |
| Norma 202 | <<locked>> | 90% | 55,941 psi | 88% | 2917 fps | 100% |
| Norma 203B | <<locked>> | 94% | 57,334 psi | 90% | 2995 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 50,995 psi | 80% | 2940 fps | 98.5% |
| Ramshot Big Game | <<locked>> | 92% | 54,288 psi | 85% | 2966 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,009 psi | 78% | 2927 fps | 96.7% |
| Ramshot TAC | <<locked>> | 88% | 56,362 psi | 88% | 2936 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 88% | 55,767 psi | 87% | 2956 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 86% | 57,203 psi | 90% | 2927 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,346 psi | 55% | 1824 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 55,564 psi | 87% | 2907 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 56,304 psi | 88% | 2940 fps | 97.6% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 54,984 psi | 86% | 3025 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 54,302 psi | 85% | 3058 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 51,097 psi | 80% | 2966 fps | 98.4% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 51,503 psi | 81% | 2989 fps | 98% |
| Rottweil R 901 | <<locked>> | 88% | 56,666 psi | 89% | 2900 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 55,883 psi | 88% | 2910 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 54,259 psi | 85% | 2940 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 98% | 54,853 psi | 86% | 2907 fps | 96.1% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 55,941 psi | 88% | 2936 fps | 98.1% |
| Shooters World Match Rifle | <<locked>> | 90% | 56,536 psi | 89% | 2946 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 56,942 psi | 89% | 2946 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 53,447 psi | 84% | 2917 fps | 96.7% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 55,216 psi | 87% | 2874 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 56,130 psi | 88% | 3002 fps | 99.7% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 54,824 psi | 86% | 2851 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 54,839 psi | 86% | 2913 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 55,347 psi | 87% | 2940 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 57,522 psi | 90% | 2858 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 57,377 psi | 90% | 2851 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 56,637 psi | 89% | 2887 fps | 97% |
| Somchem S321 | <<locked>> | 86% | 57,319 psi | 90% | 2956 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 56,463 psi | 88% | 2851 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 54,143 psi | 85% | 2907 fps | 99.6% |
| Somchem S355 | <<locked>> | 96% | 54,795 psi | 86% | 2940 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 45,426 psi | 71% | 2887 fps | 99.8% |
| Vihtavuori N130 | <<locked>> | 86% | 57,145 psi | 90% | 2822 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 57,566 psi | 90% | 2841 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 55,347 psi | 87% | 2877 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 56,492 psi | 89% | 2894 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 56,362 psi | 88% | 2920 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 53,461 psi | 84% | 2936 fps | 98.7% |
| Vihtavuori N530 | <<locked>> | 88% | 56,652 psi | 89% | 2923 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 54,665 psi | 86% | 2890 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 52,475 psi | 82% | 2940 fps | 98.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,072 psi | 60% | 2743 fps | 96.4% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 54,476 psi | 85% | 2923 fps | 99.9% |
| Winchester 748 | <<locked>> | 88% | 56,231 psi | 88% | 2972 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 54,766 psi | 86% | 3002 fps | 96.9% |
| Winchester StaBALL Match | <<locked>> | 90% | 54,926 psi | 86% | 2946 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% | 45,136 psi | 71% | 2684 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 49,298 psi | 77% | 2795 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,608 psi | 59% | 2595 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,353 psi | 70% | 2746 fps | 99.9% |
| Accurate 2700 | <<locked>> | 90% | 52,460 psi | 82% | 2825 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 35,578 psi | 56% | 2582 fps | 99.5% |
| Accurate 4350 | <<locked>> | 92% | 38,914 psi | 61% | 2713 fps | 95.9% |
| Accurate LT-30 | <<locked>> | 80% | 53,287 psi | 84% | 2766 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 53,679 psi | 84% | 2789 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 41,495 psi | 65% | 2697 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 80% | 35,331 psi | 55% | 2543 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,555 psi | 68% | 2713 fps | 99.1% |
| Alliant AR-Comp | <<locked>> | 80% | 43,134 psi | 68% | 2710 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 50,691 psi | 79% | 2920 fps | 99.6% |
| Alliant Power Pro 2000-MR | 51.2 gr | 80% | 37,449 psi | 59% | 2707 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,664 psi | 54% | 2562 fps | 96.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,850 psi | 80% | 2782 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,333 psi | 59% | 2628 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 90% | 36,883 psi | 58% | 2667 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 84% | 34,185 psi | 54% | 2631 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 98% | 33,446 psi | 52% | 2608 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 52,663 psi | 83% | 2762 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,611 psi | 64% | 2697 fps | 96.5% |
| Bofors RP3 | <<locked>> | 80% | 34,084 psi | 53% | 2562 fps | 96.8% |
| Bofors RP7 | <<locked>> | 96% | 51,517 psi | 81% | 2854 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,542 psi | 71% | 2710 fps | 99.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,959 psi | 66% | 2726 fps | 99.3% |
| Hodgdon CFE223 | <<locked>> | 80% | 46,093 psi | 72% | 2867 fps | 98.3% |
| Hodgdon H322 | <<locked>> | 80% | 49,632 psi | 78% | 2815 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 50,647 psi | 79% | 2841 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 40,074 psi | 63% | 2677 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 96% | 47,921 psi | 75% | 2884 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 41,843 psi | 66% | 2710 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 31,720 psi | 50% | 2510 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,623 psi | 59% | 2671 fps | 97.8% |
| Hodgdon Superformance | <<locked>> | 98% | 52,214 psi | 82% | 2972 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,049 psi | 41% | 1591 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,118 psi | 63% | 2657 fps | 97.9% |
| IMR 3031 | <<locked>> | 80% | 41,191 psi | 65% | 2717 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,057 psi | 58% | 2579 fps | 96.1% |
| IMR 4166 Enduron | <<locked>> | 86% | 47,863 psi | 75% | 2762 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 51,010 psi | 80% | 2746 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 50,343 psi | 79% | 2835 fps | 95.6% |
| IMR 4831 | <<locked>> | 92% | 37,492 psi | 59% | 2664 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 38,203 psi | 60% | 2657 fps | 97% |
| IMR 8208 XBR | <<locked>> | 80% | 43,555 psi | 68% | 2713 fps | 99.1% |
| Lovex D073.5 | <<locked>> | 80% | 49,124 psi | 77% | 2802 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 40,335 psi | 63% | 2680 fps | 99.6% |
| Lovex S060 | <<locked>> | 80% | 41,901 psi | 66% | 2641 fps | 97.9% |
| Lovex S062 | <<locked>> | 80% | 36,869 psi | 58% | 2585 fps | 97.9% |
| Lovex S065 | <<locked>> | 92% | 43,787 psi | 69% | 2723 fps | 95.6% |
| Lovex S070 | <<locked>> | 96% | 47,108 psi | 74% | 2808 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 40,582 psi | 64% | 2651 fps | 98.7% |
| Norma 202 | <<locked>> | 80% | 40,814 psi | 64% | 2667 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 36,695 psi | 57% | 2615 fps | 96.5% |
| Norma URP | <<locked>> | 92% | 39,218 psi | 61% | 2713 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 36,042 psi | 56% | 2618 fps | 96% |
| Ramshot Hunter | <<locked>> | 96% | 43,874 psi | 69% | 2812 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 43,540 psi | 68% | 2710 fps | 95.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,757 psi | 67% | 2733 fps | 98% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,992 psi | 74% | 2759 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,310 psi | 41% | 1631 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,733 psi | 76% | 2799 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 46,209 psi | 72% | 2769 fps | 95.4% |
| ReloadSwiss RS 52 | 49.7 gr | 80% | 38,783 psi | 61% | 2723 fps | 96.5% |
| ReloadSwiss RS 60 | 50.4 gr | 80% | 31,763 psi | 50% | 2579 fps | 97.5% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 38,870 psi | 61% | 2733 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 42,105 psi | 66% | 2802 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 44,599 psi | 70% | 2707 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,769 psi | 61% | 2605 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 80% | 32,140 psi | 50% | 2507 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 96% | 51,517 psi | 81% | 2854 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 43,787 psi | 69% | 2723 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,335 psi | 63% | 2680 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 36,869 psi | 58% | 2585 fps | 97.9% |
| Shooters World SW4350 | <<locked>> | 96% | 47,108 psi | 74% | 2808 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 51,517 psi | 81% | 2818 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,199 psi | 52% | 2552 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 51,648 psi | 81% | 2805 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,582 psi | 65% | 2677 fps | 95.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,103 psi | 63% | 2664 fps | 97.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,221 psi | 66% | 2618 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,911 psi | 55% | 2477 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 49,559 psi | 78% | 2779 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 47,050 psi | 74% | 2795 fps | 99.7% |
| Somchem S335 | <<locked>> | 80% | 41,611 psi | 65% | 2618 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,350 psi | 65% | 2680 fps | 97.7% |
| Somchem S355 | <<locked>> | 80% | 32,996 psi | 52% | 2513 fps | 95.8% |
| Somchem S365 | <<locked>> | 86% | 28,892 psi | 45% | 2490 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 47,747 psi | 75% | 2687 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,438 psi | 67% | 2615 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,927 psi | 59% | 2598 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,696 psi | 61% | 2602 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 31,430 psi | 49% | 2454 fps | 96.8% |
| Vihtavuori N160 | <<locked>> | 90% | 38,566 psi | 60% | 2661 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 43,482 psi | 68% | 2707 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 80% | 37,101 psi | 58% | 2585 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 90% | 37,927 psi | 59% | 2664 fps | 95% |
| Vihtavuori N555 | <<locked>> | 98% | 35,868 psi | 56% | 2694 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 31,937 psi | 50% | 2474 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 42,714 psi | 67% | 2749 fps | 99.5% |
| Winchester 760 | <<locked>> | 96% | 48,124 psi | 75% | 2887 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,276 psi | 62% | 2664 fps | 97.8% |
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 103 powders for .300 RCM loaded with the .308 | 155gr | Norma Kalahari. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,084 fps; across all powders the maximum-charge window runs from 1,785 fps to 3,084 fps. Accurate 4350 gives the best case fill at 100 %, and 103 of the 103 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 1:12.5 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. ReloadSwiss RS 60, Alliant Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for .300 RCM with the .308 | 155gr | Norma Kalahari 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.