Load Specifications
Bullet:.308 | 159gr | Hasler ARIETE
Bullet Manufacturer:Hasler
Bullet Weight:159 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:1:11.0
Load data in caliber .300 RCM with .308 | 159gr | Hasler ARIETE bullet and 103 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.
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% | 55,854 psi | 88% | 2805 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 54,418 psi | 85% | 2835 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 56,840 psi | 89% | 2867 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 56,173 psi | 88% | 2894 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 56,768 psi | 89% | 2913 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 49,081 psi | 77% | 2871 fps | 98.4% |
| Accurate LT-30 | <<locked>> | 82% | 55,448 psi | 87% | 2756 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,883 psi | 88% | 2782 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 55,056 psi | 86% | 2904 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 96% | 56,231 psi | 88% | 2900 fps | 99.5% |
| ADI AR 2219 | <<locked>> | 82% | 56,449 psi | 88% | 2877 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 54,201 psi | 85% | 2854 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 54,563 psi | 86% | 2838 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 55,941 psi | 88% | 2966 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 54,795 psi | 86% | 3018 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 55,579 psi | 87% | 2920 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 55,593 psi | 87% | 2812 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 56,289 psi | 88% | 2943 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 48,414 psi | 76% | 2884 fps | 98.5% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 56,536 psi | 89% | 3041 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 54,694 psi | 86% | 2749 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 54,955 psi | 86% | 2917 fps | 99.2% |
| Bofors RP3 | <<locked>> | 96% | 55,970 psi | 88% | 2933 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 56,797 psi | 89% | 2897 fps | 96.5% |
| Hodgdon Benchmark | <<locked>> | 88% | 56,492 psi | 89% | 2848 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 56,927 psi | 89% | 2940 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 55,288 psi | 87% | 2986 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 84% | 55,201 psi | 87% | 2858 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 56,260 psi | 88% | 2884 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 57,493 psi | 90% | 2949 fps | 99% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 52,939 psi | 83% | 2933 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 90% | 55,579 psi | 87% | 2913 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 44,411 psi | 70% | 2759 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 54,737 psi | 86% | 2946 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 54,331 psi | 85% | 2969 fps | 96.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,867 psi | 55% | 1749 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 57,159 psi | 90% | 2917 fps | 99.9% |
| IMR 3031 | <<locked>> | 90% | 54,969 psi | 86% | 2897 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 55,506 psi | 87% | 2884 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 92% | 56,202 psi | 88% | 2864 fps | 97% |
| IMR 4198 | <<locked>> | 84% | 55,912 psi | 88% | 2772 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 55,448 psi | 87% | 2881 fps | 96.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 46,963 psi | 74% | 2818 fps | 98% |
| IMR 4895 | <<locked>> | 94% | 57,696 psi | 90% | 2976 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 88% | 54,201 psi | 85% | 2854 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 54,288 psi | 85% | 2844 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 54,273 psi | 85% | 2877 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 55,172 psi | 86% | 2835 fps | 99.7% |
| Lovex S062 | <<locked>> | 94% | 54,824 psi | 86% | 2877 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 54,157 psi | 85% | 2871 fps | 97.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 51,401 psi | 81% | 2844 fps | 96.4% |
| Norma 201 | <<locked>> | 92% | 57,087 psi | 89% | 2897 fps | 100% |
| Norma 202 | <<locked>> | 90% | 54,027 psi | 85% | 2851 fps | 100% |
| Norma 203B | <<locked>> | 94% | 55,361 psi | 87% | 2927 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 48,936 psi | 77% | 2867 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 94% | 56,188 psi | 88% | 2956 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 48,051 psi | 75% | 2858 fps | 96.4% |
| Ramshot TAC | <<locked>> | 88% | 54,955 psi | 86% | 2874 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 88% | 54,215 psi | 85% | 2894 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 86% | 55,680 psi | 87% | 2861 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,998 psi | 55% | 1785 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 57,711 psi | 90% | 2894 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 54,346 psi | 85% | 2874 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 56,710 psi | 89% | 3012 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 56,449 psi | 88% | 3048 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 48,878 psi | 77% | 2894 fps | 98.1% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 49,719 psi | 78% | 2920 fps | 97.7% |
| Rottweil R 901 | <<locked>> | 88% | 54,534 psi | 85% | 2835 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 57,551 psi | 90% | 2894 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 55,811 psi | 87% | 2923 fps | 99.9% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 56,797 psi | 89% | 2897 fps | 96.5% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 54,157 psi | 85% | 2871 fps | 97.9% |
| Shooters World Match Rifle | <<locked>> | 90% | 54,273 psi | 85% | 2877 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 54,824 psi | 86% | 2877 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 51,401 psi | 81% | 2844 fps | 96.4% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 57,450 psi | 90% | 2864 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 56,652 psi | 89% | 2887 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 54,128 psi | 85% | 2933 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 56,681 psi | 89% | 2835 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 56,536 psi | 89% | 2900 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 57,043 psi | 89% | 2927 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,927 psi | 88% | 2795 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 55,767 psi | 87% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 54,926 psi | 86% | 2825 fps | 96.7% |
| Somchem S321 | <<locked>> | 86% | 55,593 psi | 87% | 2894 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 54,897 psi | 86% | 2792 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 56,173 psi | 88% | 2894 fps | 99.7% |
| Somchem S355 | <<locked>> | 98% | 56,130 psi | 88% | 2920 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 43,453 psi | 68% | 2815 fps | 99.7% |
| Vihtavuori N130 | <<locked>> | 86% | 55,405 psi | 87% | 2759 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,999 psi | 88% | 2782 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 57,072 psi | 89% | 2861 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 54,795 psi | 86% | 2831 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 54,520 psi | 85% | 2854 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 51,532 psi | 81% | 2867 fps | 98.5% |
| Vihtavuori N530 | <<locked>> | 88% | 54,897 psi | 86% | 2858 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 56,347 psi | 88% | 2874 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 50,560 psi | 79% | 2874 fps | 98.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 36,274 psi | 57% | 2671 fps | 95.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 52,736 psi | 83% | 2858 fps | 99.8% |
| Winchester 748 | <<locked>> | 88% | 54,230 psi | 85% | 2904 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 52,939 psi | 83% | 2933 fps | 96.6% |
| Winchester StaBALL Match | <<locked>> | 92% | 57,000 psi | 89% | 2936 fps | 100% |
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% | 43,294 psi | 68% | 2618 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,326 psi | 74% | 2726 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,621 psi | 56% | 2530 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 42,525 psi | 67% | 2680 fps | 99.8% |
| Accurate 4064 | <<locked>> | 80% | 33,692 psi | 53% | 2513 fps | 99.3% |
| Accurate 4350 | <<locked>> | 92% | 36,985 psi | 58% | 2641 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 51,909 psi | 81% | 2703 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 52,330 psi | 82% | 2730 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 40,001 psi | 63% | 2635 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 82% | 36,172 psi | 57% | 2530 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 52,750 psi | 83% | 2825 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,119 psi | 66% | 2651 fps | 99% |
| Alliant AR-Comp | <<locked>> | 80% | 41,365 psi | 65% | 2644 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 49,037 psi | 77% | 2854 fps | 99.5% |
| Alliant Power Pro 2000-MR | 49.7 gr | 80% | 36,056 psi | 56% | 2638 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,127 psi | 52% | 2497 fps | 96.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 49,066 psi | 77% | 2720 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,824 psi | 56% | 2559 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 92% | 37,797 psi | 59% | 2657 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 84% | 32,692 psi | 51% | 2559 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 51,126 psi | 80% | 2700 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,986 psi | 61% | 2628 fps | 96.1% |
| Bofors RP3 | <<locked>> | 80% | 32,372 psi | 51% | 2493 fps | 96.3% |
| Bofors RP7 | <<locked>> | 96% | 49,995 psi | 78% | 2792 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,135 psi | 69% | 2648 fps | 99.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,292 psi | 63% | 2661 fps | 99.1% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,541 psi | 70% | 2802 fps | 98.1% |
| Hodgdon H322 | <<locked>> | 80% | 48,138 psi | 75% | 2756 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 49,081 psi | 77% | 2779 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 38,450 psi | 60% | 2612 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 98% | 49,501 psi | 78% | 2874 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 80% | 40,350 psi | 63% | 2644 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 32,256 psi | 51% | 2493 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,260 psi | 57% | 2608 fps | 97.6% |
| Hodgdon Superformance | <<locked>> | 98% | 50,488 psi | 79% | 2904 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,701 psi | 40% | 1558 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,783 psi | 61% | 2598 fps | 97.7% |
| IMR 3031 | <<locked>> | 80% | 39,479 psi | 62% | 2648 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,636 psi | 56% | 2513 fps | 95.7% |
| IMR 4166 Enduron | <<locked>> | 88% | 49,356 psi | 77% | 2753 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 49,937 psi | 78% | 2687 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 48,965 psi | 77% | 2776 fps | 95.4% |
| IMR 4831 | <<locked>> | 92% | 35,795 psi | 56% | 2595 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 36,680 psi | 57% | 2592 fps | 96.7% |
| IMR 8208 XBR | <<locked>> | 80% | 42,119 psi | 66% | 2651 fps | 99% |
| Lovex D073.5 | <<locked>> | 80% | 47,224 psi | 74% | 2733 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 38,464 psi | 60% | 2612 fps | 99.4% |
| Lovex S060 | <<locked>> | 80% | 40,538 psi | 64% | 2579 fps | 97.7% |
| Lovex S062 | <<locked>> | 80% | 35,244 psi | 55% | 2516 fps | 97.6% |
| Lovex S065 | <<locked>> | 92% | 42,076 psi | 66% | 2657 fps | 95.2% |
| Lovex S070 | <<locked>> | 98% | 48,356 psi | 76% | 2792 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 39,117 psi | 61% | 2589 fps | 98.5% |
| Norma 202 | <<locked>> | 80% | 39,233 psi | 61% | 2602 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 35,186 psi | 55% | 2549 fps | 96.2% |
| Norma URP | <<locked>> | 92% | 37,623 psi | 59% | 2644 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 34,606 psi | 54% | 2552 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 98% | 44,976 psi | 70% | 2799 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 41,916 psi | 66% | 2641 fps | 95.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,263 psi | 65% | 2667 fps | 97.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,513 psi | 71% | 2697 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,904 psi | 41% | 1594 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 47,326 psi | 74% | 2740 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 44,657 psi | 70% | 2707 fps | 95.1% |
| ReloadSwiss RS 52 | 48.2 gr | 80% | 37,130 psi | 58% | 2654 fps | 96.1% |
| ReloadSwiss RS 60 | 49 gr | 80% | 30,560 psi | 48% | 2513 fps | 97.1% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 39,726 psi | 62% | 2720 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 43,482 psi | 68% | 2795 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 42,583 psi | 67% | 2638 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 37,057 psi | 58% | 2539 fps | 98% |
| Rottweil R 903 | <<locked>> | 80% | 30,443 psi | 48% | 2434 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 96% | 49,995 psi | 78% | 2792 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 92% | 42,076 psi | 66% | 2657 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,464 psi | 60% | 2612 fps | 99.4% |
| Shooters World Precision | <<locked>> | 80% | 35,244 psi | 55% | 2516 fps | 97.6% |
| Shooters World SW4350 | <<locked>> | 98% | 48,356 psi | 76% | 2792 fps | 95.7% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 49,995 psi | 78% | 2756 fps | 99.7% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 53,113 psi | 83% | 2835 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 33,910 psi | 53% | 2543 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 50,009 psi | 78% | 2743 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 39,943 psi | 63% | 2612 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,551 psi | 60% | 2602 fps | 97.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,654 psi | 64% | 2556 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,446 psi | 52% | 2415 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 47,747 psi | 75% | 2710 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 45,223 psi | 71% | 2726 fps | 99.5% |
| Somchem S335 | <<locked>> | 80% | 40,292 psi | 63% | 2559 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 39,682 psi | 62% | 2615 fps | 97.4% |
| Somchem S355 | <<locked>> | 80% | 31,589 psi | 50% | 2451 fps | 95.4% |
| Somchem S365 | <<locked>> | 88% | 29,356 psi | 46% | 2477 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 46,137 psi | 72% | 2628 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,915 psi | 64% | 2556 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,172 psi | 57% | 2530 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,202 psi | 58% | 2539 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 80% | 29,965 psi | 47% | 2388 fps | 96.3% |
| Vihtavuori N160 | <<locked>> | 90% | 36,970 psi | 58% | 2595 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 42,047 psi | 66% | 2644 fps | 99% |
| Vihtavuori N540 | <<locked>> | 80% | 35,694 psi | 56% | 2523 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 92% | 38,638 psi | 61% | 2648 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 98% | 34,011 psi | 53% | 2618 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 32,808 psi | 51% | 2467 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 41,350 psi | 65% | 2687 fps | 99.4% |
| Winchester 760 | <<locked>> | 98% | 49,501 psi | 78% | 2874 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,768 psi | 59% | 2602 fps | 97.6% |
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 | 159gr | Hasler ARIETE. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,048 fps; across all powders the maximum-charge window runs from 1,749 fps to 3,048 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 47–90 %, leaving at least 10 % headroom. The 159.0 gr projectile in 0.308" calls for a 1:11.0 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 | 159gr | Hasler ARIETE they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, Alliant Reloder-26, Norma 204 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.