Load Specifications
Bullet:.308 | 155gr | Norma GTX
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:1:13.5
Load data in caliber .300 RCM with .308 | 155gr | Norma GTX bullet and 104 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 Alliant Reloder-17.
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>> | 86% | 55,753 psi | 87% | 2854 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 57,696 psi | 90% | 2927 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 57,450 psi | 90% | 2920 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,188 psi | 88% | 2943 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 57,174 psi | 90% | 2913 fps | 96.5% |
| Accurate 4064 | <<locked>> | 94% | 57,203 psi | 90% | 2963 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,316 psi | 84% | 2989 fps | 99% |
| Accurate LT-30 | <<locked>> | 82% | 57,711 psi | 90% | 2835 fps | 100% |
| ADI AR 2206H | <<locked>> | 88% | 54,723 psi | 86% | 2949 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 94% | 55,738 psi | 87% | 2946 fps | 99.5% |
| ADI Benchmark 8208 | <<locked>> | 88% | 57,319 psi | 90% | 2953 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 54,186 psi | 85% | 2881 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,550 psi | 87% | 3012 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,346 psi | 85% | 3064 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,564 psi | 87% | 2969 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,158 psi | 86% | 2854 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 56,231 psi | 88% | 2989 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,576 psi | 81% | 2989 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 98% | 56,188 psi | 88% | 3087 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,767 psi | 58% | 2707 fps | 97.1% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 57,058 psi | 89% | 2831 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,462 psi | 85% | 2959 fps | 99.2% |
| Bofors RP3 | <<locked>> | 94% | 56,014 psi | 88% | 2982 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 56,565 psi | 89% | 2949 fps | 96.6% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,811 psi | 87% | 2887 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 56,565 psi | 89% | 2982 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,795 psi | 86% | 3028 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 82% | 54,288 psi | 85% | 2897 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,579 psi | 87% | 2923 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 57,464 psi | 90% | 2999 fps | 99.1% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 56,449 psi | 88% | 3038 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 98% | 57,334 psi | 90% | 3002 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 88% | 55,259 psi | 87% | 2959 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,718 psi | 75% | 2864 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 54,418 psi | 85% | 2989 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 53,693 psi | 84% | 3012 fps | 96.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,201 psi | 55% | 1798 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,710 psi | 89% | 2963 fps | 99.9% |
| IMR 3031 | <<locked>> | 88% | 55,056 psi | 86% | 2946 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,230 psi | 87% | 2930 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,550 psi | 87% | 2907 fps | 97% |
| IMR 4198 | <<locked>> | 82% | 55,390 psi | 87% | 2815 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,069 psi | 83% | 2913 fps | 96% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,868 psi | 86% | 2923 fps | 96.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,415 psi | 79% | 2923 fps | 98.7% |
| IMR 4895 | <<locked>> | 92% | 57,653 psi | 90% | 3022 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 88% | 57,319 psi | 90% | 2953 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 53,969 psi | 85% | 2887 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,418 psi | 85% | 2927 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,476 psi | 85% | 2877 fps | 99.7% |
| Lovex S062 | <<locked>> | 92% | 54,824 psi | 86% | 2927 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 57,566 psi | 90% | 2972 fps | 98.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,795 psi | 86% | 2949 fps | 97.2% |
| Norma 201 | <<locked>> | 90% | 56,826 psi | 89% | 2943 fps | 100% |
| Norma 202 | <<locked>> | 90% | 57,363 psi | 90% | 2946 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,390 psi | 87% | 2976 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 52,373 psi | 82% | 2972 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 92% | 56,014 psi | 88% | 3005 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,416 psi | 81% | 2963 fps | 97.3% |
| Ramshot TAC | <<locked>> | 86% | 54,157 psi | 85% | 2913 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 88% | 57,276 psi | 90% | 2989 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,766 psi | 86% | 2900 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,621 psi | 56% | 1841 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 56,739 psi | 89% | 2933 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 57,624 psi | 90% | 2976 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 56,434 psi | 88% | 3058 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,956 psi | 88% | 3091 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 53,011 psi | 83% | 3009 fps | 98.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,084 psi | 83% | 3031 fps | 98.5% |
| Rottweil R 901 | <<locked>> | 86% | 54,505 psi | 85% | 2881 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 57,246 psi | 90% | 2940 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,854 psi | 88% | 2972 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 56,565 psi | 89% | 2949 fps | 96.6% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 57,566 psi | 90% | 2972 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,418 psi | 85% | 2927 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,824 psi | 86% | 2927 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,795 psi | 86% | 2949 fps | 97.2% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 56,579 psi | 89% | 2904 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,099 psi | 85% | 2982 fps | 99.7% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,043 psi | 88% | 2877 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 56,318 psi | 88% | 2949 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 56,507 psi | 89% | 2969 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,347 psi | 87% | 2841 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,347 psi | 87% | 2835 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,607 psi | 86% | 2871 fps | 96.8% |
| Somchem S321 | <<locked>> | 84% | 55,129 psi | 86% | 2936 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,418 psi | 85% | 2835 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,593 psi | 87% | 2936 fps | 99.7% |
| Somchem S355 | <<locked>> | 96% | 56,347 psi | 88% | 2972 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,007 psi | 74% | 2923 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 54,940 psi | 86% | 2802 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,521 psi | 87% | 2825 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 56,942 psi | 89% | 2907 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,375 psi | 85% | 2874 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,273 psi | 85% | 2900 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,187 psi | 86% | 2972 fps | 99.1% |
| Vihtavuori N530 | <<locked>> | 86% | 54,215 psi | 85% | 2900 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 56,144 psi | 88% | 2920 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,027 psi | 85% | 2976 fps | 98.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,581 psi | 62% | 2785 fps | 97.1% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,999 psi | 88% | 2956 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 57,653 psi | 90% | 3002 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 56,753 psi | 89% | 3045 fps | 97.4% |
| Winchester StaBALL Match | <<locked>> | 90% | 56,724 psi | 89% | 2982 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% | 46,180 psi | 72% | 2710 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,473 psi | 79% | 2822 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,899 psi | 61% | 2628 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,527 psi | 71% | 2776 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 50,343 psi | 79% | 2805 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 36,753 psi | 58% | 2615 fps | 99.7% |
| Accurate 4350 | <<locked>> | 90% | 37,492 psi | 59% | 2690 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 54,244 psi | 85% | 2789 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 42,583 psi | 67% | 2733 fps | 98.2% |
| ADI AR 2208 | <<locked>> | 80% | 36,158 psi | 57% | 2572 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,657 psi | 70% | 2743 fps | 99.4% |
| Alliant AR-Comp | <<locked>> | 80% | 44,585 psi | 70% | 2740 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,127 psi | 82% | 2956 fps | 99.8% |
| Alliant Power Pro 2000-MR | 52.6 gr | 80% | 38,522 psi | 60% | 2746 fps | 96.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,708 psi | 56% | 2595 fps | 97.3% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,025 psi | 82% | 2808 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,392 psi | 60% | 2657 fps | 96.6% |
| Alliant Reloder-16 | <<locked>> | 90% | 37,898 psi | 59% | 2707 fps | 95.7% |
| Alliant Reloder-17 | 53.1 gr | 82% | 32,880 psi | 52% | 2605 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 96% | 32,547 psi | 51% | 2595 fps | 95.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 53,606 psi | 84% | 2785 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,597 psi | 65% | 2726 fps | 96.9% |
| Bofors RP3 | <<locked>> | 80% | 35,114 psi | 55% | 2595 fps | 97.3% |
| Bofors RP7 | <<locked>> | 94% | 49,734 psi | 78% | 2835 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,383 psi | 73% | 2736 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,250 psi | 68% | 2762 fps | 99.5% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,529 psi | 74% | 2904 fps | 98.7% |
| Hodgdon H322 | <<locked>> | 80% | 50,923 psi | 80% | 2848 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,735 psi | 81% | 2867 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 38,551 psi | 60% | 2651 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 94% | 46,209 psi | 72% | 2861 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 96% | 53,940 psi | 85% | 2946 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 42,989 psi | 67% | 2743 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 32,503 psi | 51% | 2539 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,856 psi | 61% | 2707 fps | 98.3% |
| Hodgdon Superformance | <<locked>> | 96% | 50,169 psi | 79% | 2949 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,107 psi | 41% | 1604 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,176 psi | 65% | 2690 fps | 98.3% |
| IMR 3031 | <<locked>> | 80% | 42,308 psi | 66% | 2743 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,942 psi | 59% | 2608 fps | 96.6% |
| IMR 4166 Enduron | <<locked>> | 86% | 48,965 psi | 77% | 2795 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 52,257 psi | 82% | 2772 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 49,676 psi | 78% | 2858 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 92% | 48,646 psi | 76% | 2818 fps | 95.4% |
| IMR 4831 | <<locked>> | 90% | 36,419 psi | 57% | 2648 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 39,320 psi | 62% | 2694 fps | 97.5% |
| IMR 8208 XBR | <<locked>> | 80% | 44,657 psi | 70% | 2743 fps | 99.4% |
| Lovex D073.5 | <<locked>> | 80% | 50,502 psi | 79% | 2831 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,510 psi | 65% | 2713 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 42,728 psi | 67% | 2667 fps | 98.2% |
| Lovex S062 | <<locked>> | 80% | 37,768 psi | 59% | 2615 fps | 98.3% |
| Lovex S065 | <<locked>> | 90% | 42,279 psi | 66% | 2703 fps | 95.4% |
| Lovex S070 | <<locked>> | 94% | 45,513 psi | 71% | 2789 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 41,713 psi | 65% | 2684 fps | 99% |
| Norma 202 | <<locked>> | 80% | 42,003 psi | 66% | 2697 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,782 psi | 59% | 2648 fps | 97% |
| Norma URP | <<locked>> | 90% | 37,855 psi | 59% | 2694 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 37,188 psi | 58% | 2654 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 96% | 45,281 psi | 71% | 2851 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 44,469 psi | 70% | 2740 fps | 96.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,758 psi | 69% | 2759 fps | 98.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,196 psi | 76% | 2792 fps | 99% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,556 psi | 42% | 1647 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,922 psi | 78% | 2828 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 44,527 psi | 70% | 2749 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,001 psi | 63% | 2759 fps | 97.1% |
| ReloadSwiss RS 60 | 51.8 gr | 80% | 32,764 psi | 51% | 2615 fps | 98.1% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 37,463 psi | 59% | 2710 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 40,567 psi | 64% | 2779 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 45,614 psi | 71% | 2736 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,697 psi | 62% | 2635 fps | 98.6% |
| Rottweil R 903 | <<locked>> | 80% | 33,011 psi | 52% | 2536 fps | 96.3% |
| Rottweil R 907 | <<locked>> | 94% | 49,734 psi | 78% | 2835 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 42,279 psi | 66% | 2703 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,510 psi | 65% | 2713 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 37,768 psi | 59% | 2615 fps | 98.3% |
| Shooters World SW4350 | <<locked>> | 94% | 45,513 psi | 71% | 2789 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,910 psi | 83% | 2851 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,098 psi | 53% | 2585 fps | 95.6% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,866 psi | 83% | 2831 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,815 psi | 67% | 2713 fps | 96.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,104 psi | 64% | 2697 fps | 97.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,207 psi | 68% | 2648 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,781 psi | 56% | 2507 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 47,747 psi | 75% | 2759 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 48,109 psi | 75% | 2822 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 42,772 psi | 67% | 2648 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,351 psi | 66% | 2710 fps | 98.1% |
| Somchem S355 | <<locked>> | 80% | 34,026 psi | 53% | 2546 fps | 96.3% |
| Somchem S365 | <<locked>> | 84% | 28,036 psi | 44% | 2470 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 48,791 psi | 76% | 2713 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,439 psi | 68% | 2641 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,986 psi | 61% | 2625 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,610 psi | 62% | 2628 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 32,227 psi | 51% | 2480 fps | 97.2% |
| Vihtavuori N160 | <<locked>> | 88% | 37,231 psi | 58% | 2641 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 44,628 psi | 70% | 2740 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 80% | 38,101 psi | 60% | 2615 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 90% | 39,001 psi | 61% | 2697 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 96% | 34,809 psi | 55% | 2674 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 32,866 psi | 52% | 2510 fps | 95.9% |
| Winchester 748 | <<locked>> | 80% | 44,150 psi | 69% | 2785 fps | 99.7% |
| Winchester 760 | <<locked>> | 94% | 46,470 psi | 73% | 2867 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,321 psi | 63% | 2697 fps | 98.2% |
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 115 powders for .300 RCM loaded with the .308 | 155gr | Norma GTX. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,091 fps; across all powders the maximum-charge window runs from 1,798 fps to 3,091 fps. Accurate 3100 gives the best case fill at 100 %, and 115 of the 115 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, ADI AR 2209 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, Alliant Reloder-17 rank at the top here: for .300 RCM with the .308 | 155gr | Norma GTX they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 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.