Load Specifications
Bullet Manufacturer:TWENTY-NINE
Bullet Weight:167 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:1:11.5
Load data in caliber .300 RCM with .308 | 167gr | TWENTY-NINE SILENTIO bullet and 105 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 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% | 55,608 psi | 87% | 2726 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 53,853 psi | 84% | 2749 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 57,377 psi | 90% | 2792 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,941 psi | 88% | 2815 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 57,188 psi | 90% | 2795 fps | 96.8% |
| Accurate 4064 | <<locked>> | 94% | 57,043 psi | 89% | 2838 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,026 psi | 83% | 2864 fps | 99.2% |
| ADI AR 2206H | <<locked>> | 88% | 54,520 psi | 85% | 2822 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 94% | 55,506 psi | 87% | 2822 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 88% | 57,087 psi | 89% | 2825 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 54,375 psi | 85% | 2756 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,637 psi | 87% | 2884 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,027 psi | 85% | 2936 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,201 psi | 87% | 2841 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,390 psi | 87% | 2733 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 56,115 psi | 88% | 2867 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,401 psi | 81% | 2867 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 98% | 55,927 psi | 88% | 2959 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,622 psi | 57% | 2602 fps | 97.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,553 psi | 64% | 2743 fps | 96.4% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 57,188 psi | 90% | 2710 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,302 psi | 85% | 2835 fps | 99.4% |
| Bofors RP3 | <<locked>> | 94% | 55,869 psi | 88% | 2858 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 56,231 psi | 88% | 2825 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,593 psi | 87% | 2759 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 56,594 psi | 89% | 2858 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,665 psi | 86% | 2900 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 82% | 54,375 psi | 85% | 2772 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,361 psi | 87% | 2799 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 57,087 psi | 89% | 2871 fps | 99.3% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 56,130 psi | 88% | 2913 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 98% | 57,305 psi | 90% | 2877 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 88% | 55,056 psi | 86% | 2831 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,442 psi | 74% | 2746 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 54,157 psi | 85% | 2864 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 57,508 psi | 90% | 2953 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,273 psi | 55% | 1706 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,376 psi | 88% | 2835 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 54,853 psi | 86% | 2818 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,143 psi | 86% | 2805 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,332 psi | 87% | 2782 fps | 97.3% |
| IMR 4198 | <<locked>> | 82% | 55,230 psi | 87% | 2687 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,837 psi | 83% | 2792 fps | 96.3% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,694 psi | 86% | 2805 fps | 97.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,140 psi | 79% | 2802 fps | 98.9% |
| IMR 4895 | <<locked>> | 92% | 57,537 psi | 90% | 2897 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 57,087 psi | 89% | 2825 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 57,725 psi | 90% | 2815 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,128 psi | 85% | 2802 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,607 psi | 86% | 2756 fps | 99.8% |
| Lovex S062 | <<locked>> | 92% | 54,766 psi | 86% | 2802 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 57,435 psi | 90% | 2851 fps | 98.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,694 psi | 86% | 2831 fps | 97.5% |
| Norma 201 | <<locked>> | 90% | 56,927 psi | 89% | 2822 fps | 100% |
| Norma 202 | <<locked>> | 90% | 57,479 psi | 90% | 2822 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,274 psi | 87% | 2854 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 52,344 psi | 82% | 2851 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 92% | 55,898 psi | 88% | 2881 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,213 psi | 80% | 2844 fps | 97.6% |
| Ramshot TAC | <<locked>> | 88% | 57,580 psi | 90% | 2844 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 88% | 57,014 psi | 89% | 2861 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,737 psi | 86% | 2779 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,737 psi | 56% | 1749 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 56,869 psi | 89% | 2808 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 57,479 psi | 90% | 2851 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 56,449 psi | 88% | 2933 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,782 psi | 87% | 2963 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,634 psi | 82% | 2884 fps | 99% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,910 psi | 83% | 2910 fps | 98.8% |
| Rottweil R 901 | <<locked>> | 86% | 54,534 psi | 85% | 2756 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 57,406 psi | 90% | 2818 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,724 psi | 87% | 2848 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 56,231 psi | 88% | 2825 fps | 97% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 57,435 psi | 90% | 2851 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,128 psi | 85% | 2802 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,766 psi | 86% | 2802 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,694 psi | 86% | 2831 fps | 97.5% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 56,579 psi | 89% | 2782 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 57,522 psi | 90% | 2910 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,289 psi | 88% | 2753 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 56,130 psi | 88% | 2825 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 56,507 psi | 89% | 2848 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,303 psi | 87% | 2717 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,216 psi | 87% | 2713 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,491 psi | 85% | 2753 fps | 97.2% |
| Somchem S321 | <<locked>> | 84% | 54,839 psi | 86% | 2808 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,302 psi | 85% | 2710 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,434 psi | 87% | 2815 fps | 99.8% |
| Somchem S355 | <<locked>> | 96% | 56,144 psi | 88% | 2848 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,731 psi | 73% | 2805 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 55,085 psi | 86% | 2680 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,434 psi | 87% | 2700 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 56,884 psi | 89% | 2782 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,273 psi | 85% | 2753 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 57,595 psi | 90% | 2822 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 54,911 psi | 86% | 2851 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 86% | 54,172 psi | 85% | 2776 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 55,869 psi | 88% | 2795 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,027 psi | 85% | 2858 fps | 99.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,450 psi | 62% | 2677 fps | 97.5% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,593 psi | 87% | 2831 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 57,522 psi | 90% | 2874 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 56,463 psi | 88% | 2917 fps | 97.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,648 psi | 51% | 2575 fps | 96.6% |
| Winchester StaBALL Match | <<locked>> | 90% | 56,275 psi | 88% | 2851 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% | 46,311 psi | 73% | 2595 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,444 psi | 79% | 2700 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,885 psi | 61% | 2516 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,542 psi | 71% | 2661 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 50,227 psi | 79% | 2687 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 36,753 psi | 58% | 2507 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 34,896 psi | 55% | 2526 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 42,525 psi | 67% | 2615 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 80% | 36,129 psi | 57% | 2464 fps | 96.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,599 psi | 70% | 2625 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 44,527 psi | 70% | 2618 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,025 psi | 82% | 2828 fps | 99.9% |
| Alliant Power Pro 2000-MR | 49.5 gr | 80% | 38,435 psi | 60% | 2635 fps | 96.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,563 psi | 56% | 2487 fps | 97.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,083 psi | 82% | 2687 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,334 psi | 60% | 2549 fps | 97.1% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,549 psi | 56% | 2543 fps | 95.4% |
| Alliant Reloder-17 | 48.8 gr | 80% | 30,763 psi | 48% | 2444 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 96% | 32,430 psi | 51% | 2493 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 37,724 psi | 59% | 2677 fps | 95.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 53,548 psi | 84% | 2664 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,510 psi | 65% | 2615 fps | 97.3% |
| Bofors RP3 | <<locked>> | 80% | 35,099 psi | 55% | 2490 fps | 97.7% |
| Bofors RP7 | <<locked>> | 94% | 49,603 psi | 78% | 2717 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,441 psi | 73% | 2618 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,105 psi | 68% | 2644 fps | 99.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,500 psi | 74% | 2785 fps | 99% |
| Hodgdon H322 | <<locked>> | 80% | 50,821 psi | 80% | 2720 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,895 psi | 81% | 2749 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 38,522 psi | 60% | 2546 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 94% | 46,253 psi | 72% | 2749 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 94% | 50,372 psi | 79% | 2769 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 42,902 psi | 67% | 2628 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 30,661 psi | 48% | 2392 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,827 psi | 61% | 2595 fps | 98.6% |
| Hodgdon Superformance | <<locked>> | 96% | 49,980 psi | 78% | 2831 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,281 psi | 41% | 1526 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,104 psi | 64% | 2579 fps | 98.6% |
| IMR 3031 | <<locked>> | 80% | 42,221 psi | 66% | 2625 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,884 psi | 59% | 2497 fps | 97% |
| IMR 4166 Enduron | <<locked>> | 84% | 45,934 psi | 72% | 2625 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 52,185 psi | 82% | 2644 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 49,501 psi | 78% | 2740 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 45,687 psi | 72% | 2651 fps | 95.1% |
| IMR 4831 | <<locked>> | 90% | 36,318 psi | 57% | 2543 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 39,233 psi | 61% | 2579 fps | 97.9% |
| IMR 8208 XBR | <<locked>> | 80% | 44,599 psi | 70% | 2625 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 80% | 50,357 psi | 79% | 2713 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,379 psi | 65% | 2595 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 42,699 psi | 67% | 2556 fps | 98.6% |
| Lovex S062 | <<locked>> | 80% | 37,768 psi | 59% | 2507 fps | 98.6% |
| Lovex S065 | <<locked>> | 88% | 39,697 psi | 62% | 2543 fps | 95.1% |
| Lovex S070 | <<locked>> | 94% | 45,266 psi | 71% | 2671 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 41,742 psi | 65% | 2572 fps | 99.3% |
| Norma 202 | <<locked>> | 80% | 41,800 psi | 66% | 2579 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,695 psi | 59% | 2539 fps | 97.5% |
| Norma URP | <<locked>> | 88% | 35,520 psi | 56% | 2533 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 37,028 psi | 58% | 2546 fps | 97.1% |
| Ramshot Hunter | <<locked>> | 94% | 42,163 psi | 66% | 2677 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 44,382 psi | 70% | 2625 fps | 96.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,874 psi | 69% | 2651 fps | 98.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,080 psi | 75% | 2674 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,585 psi | 42% | 1562 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,922 psi | 78% | 2707 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 44,469 psi | 70% | 2638 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,885 psi | 63% | 2648 fps | 97.5% |
| ReloadSwiss RS 60 | 48.8 gr | 80% | 32,764 psi | 51% | 2513 fps | 98.6% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 37,304 psi | 58% | 2602 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 40,466 psi | 63% | 2671 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 45,672 psi | 72% | 2618 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,610 psi | 62% | 2523 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 80% | 33,054 psi | 52% | 2434 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 94% | 49,603 psi | 78% | 2717 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 39,697 psi | 62% | 2543 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,379 psi | 65% | 2595 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 37,768 psi | 59% | 2507 fps | 98.6% |
| Shooters World SW4350 | <<locked>> | 94% | 45,266 psi | 71% | 2671 fps | 95.5% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,707 psi | 83% | 2726 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,982 psi | 53% | 2480 fps | 96.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,895 psi | 83% | 2707 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,685 psi | 67% | 2602 fps | 96.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,002 psi | 64% | 2585 fps | 98.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,207 psi | 68% | 2533 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,810 psi | 56% | 2402 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 44,672 psi | 70% | 2595 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 47,993 psi | 75% | 2703 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 42,728 psi | 67% | 2533 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,250 psi | 66% | 2598 fps | 98.4% |
| Somchem S355 | <<locked>> | 80% | 34,026 psi | 53% | 2444 fps | 96.9% |
| Somchem S365 | <<locked>> | 84% | 28,007 psi | 44% | 2375 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 48,820 psi | 77% | 2595 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,468 psi | 68% | 2526 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,001 psi | 61% | 2513 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,668 psi | 62% | 2520 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,285 psi | 51% | 2382 fps | 97.7% |
| Vihtavuori N160 | <<locked>> | 88% | 37,057 psi | 58% | 2533 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 44,614 psi | 70% | 2621 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 80% | 38,145 psi | 60% | 2507 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 36,579 psi | 57% | 2539 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 94% | 32,561 psi | 51% | 2516 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,748 psi | 48% | 2356 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 44,063 psi | 69% | 2667 fps | 99.9% |
| Winchester 760 | <<locked>> | 94% | 46,253 psi | 72% | 2749 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 98% | 30,618 psi | 48% | 2510 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,335 psi | 63% | 2585 fps | 98.6% |
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 105 powders for .300 RCM loaded with the .308 | 167gr | TWENTY-NINE SILENTIO. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,963 fps; across all powders the maximum-charge window runs from 1,706 fps to 2,963 fps. Accurate 4350 gives the best case fill at 100 %, and 105 of the 105 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 167.0 gr projectile in 0.308" calls for a 1:11.5 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, Alliant Reloder-17 rank at the top here: for .300 RCM with the .308 | 167gr | TWENTY-NINE SILENTIO 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.