Load Specifications
Bullet Manufacturer:TWENTY-NINE
Bullet Weight:178 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Case Length (l3):2.003"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:74 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:65,000 psi
Recommended Twist Rate:1:11.0
Load data in caliber .300 Rem. SA Ultra Mag. with .308 | 178gr | TWENTY-NINE SILENTIO bullet and 106 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, Alliant Reloder-17 and ReloadSwiss RS 60.
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% | 57,319 psi | 88% | 2654 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,738 psi | 86% | 2684 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 55,811 psi | 86% | 2677 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 57,885 psi | 89% | 2746 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 58,798 psi | 90% | 2730 fps | 97.7% |
| Accurate 4064 | <<locked>> | 92% | 55,680 psi | 86% | 2723 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 55,288 psi | 85% | 2805 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 88% | 56,478 psi | 87% | 2759 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 57,246 psi | 88% | 2753 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 55,288 psi | 85% | 2707 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 56,072 psi | 86% | 2680 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 57,246 psi | 88% | 2812 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 56,101 psi | 86% | 2874 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 57,130 psi | 88% | 2776 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 56,855 psi | 87% | 2654 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 57,711 psi | 89% | 2799 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 53,084 psi | 82% | 2808 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 98% | 58,131 psi | 89% | 2897 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,000 psi | 58% | 2556 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,148 psi | 65% | 2703 fps | 97.7% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 58,653 psi | 90% | 2638 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 56,188 psi | 86% | 2776 fps | 99.8% |
| Bofors RP3 | <<locked>> | 94% | 58,030 psi | 89% | 2792 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 57,914 psi | 89% | 2762 fps | 97.8% |
| Hodgdon Benchmark | <<locked>> | 86% | 57,203 psi | 88% | 2690 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 58,305 psi | 90% | 2785 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 56,666 psi | 87% | 2835 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 56,072 psi | 86% | 2700 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 56,956 psi | 88% | 2723 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 55,390 psi | 85% | 2756 fps | 99.4% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 58,392 psi | 90% | 2858 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 96% | 55,448 psi | 85% | 2766 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 88% | 57,014 psi | 88% | 2769 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,516 psi | 76% | 2690 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 56,202 psi | 86% | 2799 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 55,317 psi | 85% | 2838 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,389 psi | 54% | 1647 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 58,073 psi | 89% | 2766 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 56,913 psi | 88% | 2746 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 56,811 psi | 87% | 2740 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 90% | 56,927 psi | 88% | 2723 fps | 98.1% |
| IMR 4198 | <<locked>> | 82% | 56,782 psi | 87% | 2612 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 54,607 psi | 84% | 2736 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 96% | 56,521 psi | 87% | 2746 fps | 98% |
| IMR 4831ᴾ | <<locked>> | 100% | 52,112 psi | 80% | 2743 fps | 99.5% |
| IMR 4895 | <<locked>> | 90% | 55,738 psi | 86% | 2779 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 55,288 psi | 85% | 2707 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 55,753 psi | 86% | 2697 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 56,072 psi | 86% | 2733 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,941 psi | 86% | 2687 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 56,478 psi | 87% | 2733 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,782 psi | 86% | 2736 fps | 99% |
| Lovex S070ᴾ | <<locked>> | 100% | 56,536 psi | 87% | 2769 fps | 98.3% |
| Norma 201 | <<locked>> | 90% | 58,566 psi | 90% | 2749 fps | 100% |
| Norma 202 | <<locked>> | 88% | 55,753 psi | 86% | 2707 fps | 100% |
| Norma 203B | <<locked>> | 92% | 56,869 psi | 87% | 2785 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 55,332 psi | 85% | 2785 fps | 96.1% |
| Norma URPᴾ | <<locked>> | 100% | 54,317 psi | 84% | 2792 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 92% | 57,841 psi | 89% | 2815 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 53,229 psi | 82% | 2792 fps | 98.5% |
| Ramshot TAC | <<locked>> | 86% | 55,796 psi | 86% | 2730 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 86% | 55,245 psi | 85% | 2746 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 56,289 psi | 87% | 2710 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,911 psi | 55% | 1686 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 58,378 psi | 90% | 2736 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,796 psi | 86% | 2740 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 58,624 psi | 90% | 2867 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 57,856 psi | 89% | 2897 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,708 psi | 84% | 2825 fps | 99.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,694 psi | 84% | 2854 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 86% | 56,188 psi | 86% | 2684 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 55,666 psi | 86% | 2703 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 57,551 psi | 89% | 2782 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 57,914 psi | 89% | 2762 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,782 psi | 86% | 2736 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 88% | 56,072 psi | 86% | 2733 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 56,478 psi | 87% | 2733 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 56,536 psi | 87% | 2769 fps | 98.3% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 58,189 psi | 90% | 2710 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,753 psi | 86% | 2792 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 57,827 psi | 89% | 2677 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 57,827 psi | 89% | 2759 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 58,378 psi | 90% | 2779 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 56,637 psi | 87% | 2641 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 56,826 psi | 87% | 2641 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 56,246 psi | 87% | 2694 fps | 98% |
| Somchem S321 | <<locked>> | 84% | 56,579 psi | 87% | 2740 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 56,072 psi | 86% | 2641 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 57,392 psi | 88% | 2749 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 57,798 psi | 89% | 2776 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,646 psi | 75% | 2746 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 56,536 psi | 87% | 2605 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 56,811 psi | 87% | 2625 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 58,711 psi | 90% | 2707 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 56,246 psi | 87% | 2684 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,840 psi | 86% | 2710 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 56,985 psi | 88% | 2789 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 86% | 56,057 psi | 86% | 2710 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 57,783 psi | 89% | 2726 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 55,811 psi | 86% | 2792 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,234 psi | 63% | 2628 fps | 98.5% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 57,421 psi | 88% | 2769 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 55,695 psi | 86% | 2753 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 58,653 psi | 90% | 2861 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,939 psi | 52% | 2549 fps | 98.2% |
| Winchester StaBALL Match | <<locked>> | 90% | 58,276 psi | 90% | 2789 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% | 47,616 psi | 73% | 2523 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,156 psi | 80% | 2635 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,335 psi | 62% | 2454 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,239 psi | 73% | 2598 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 48,573 psi | 75% | 2579 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 38,130 psi | 59% | 2451 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 34,055 psi | 52% | 2428 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 43,874 psi | 67% | 2556 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 80% | 37,405 psi | 58% | 2415 fps | 97.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,934 psi | 71% | 2562 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 46,093 psi | 71% | 2549 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 53,722 psi | 83% | 2759 fps | 100% |
| Alliant Power Pro 2000-MR | 48.6 gr | 80% | 39,813 psi | 61% | 2585 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,985 psi | 57% | 2438 fps | 98.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 53,432 psi | 82% | 2612 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,610 psi | 61% | 2493 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 86% | 34,490 psi | 53% | 2441 fps | 95.8% |
| Alliant Reloder-17 | 47.8 gr | 80% | 31,720 psi | 49% | 2398 fps | 96.6% |
| Alliant Reloder-23 | <<locked>> | 92% | 29,733 psi | 46% | 2349 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 96% | 36,579 psi | 56% | 2579 fps | 95.7% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 55,158 psi | 85% | 2595 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,062 psi | 66% | 2562 fps | 98.3% |
| Bofors RP3 | <<locked>> | 80% | 36,448 psi | 56% | 2438 fps | 98.6% |
| Bofors RP7 | <<locked>> | 90% | 45,397 psi | 70% | 2562 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,674 psi | 73% | 2552 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,730 psi | 69% | 2589 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 49,226 psi | 76% | 2723 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 80% | 52,692 psi | 81% | 2654 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 53,345 psi | 82% | 2677 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 37,376 psi | 58% | 2441 fps | 96.1% |
| Hodgdon H414 | <<locked>> | 90% | 41,829 psi | 64% | 2582 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 92% | 48,849 psi | 75% | 2661 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 44,251 psi | 68% | 2566 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,718 psi | 46% | 2293 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,089 psi | 62% | 2539 fps | 99.3% |
| Hodgdon Superformance | <<locked>> | 92% | 44,686 psi | 69% | 2657 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,440 psi | 41% | 1473 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,598 psi | 66% | 2523 fps | 99.3% |
| IMR 3031 | <<locked>> | 80% | 43,990 psi | 68% | 2562 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,276 psi | 60% | 2448 fps | 98% |
| IMR 4166 Enduron | <<locked>> | 82% | 44,382 psi | 68% | 2516 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 53,606 psi | 82% | 2572 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 45,310 psi | 70% | 2585 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 44,367 psi | 68% | 2546 fps | 95.5% |
| IMR 4831 | <<locked>> | 86% | 33,098 psi | 51% | 2388 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 40,553 psi | 62% | 2523 fps | 98.7% |
| IMR 8208 XBR | <<locked>> | 80% | 45,934 psi | 71% | 2562 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 51,895 psi | 80% | 2644 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,917 psi | 66% | 2539 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,106 psi | 68% | 2497 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 39,189 psi | 60% | 2451 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 38,725 psi | 60% | 2444 fps | 95.6% |
| Lovex S070 | <<locked>> | 90% | 41,568 psi | 64% | 2523 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 43,004 psi | 66% | 2513 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 43,381 psi | 67% | 2523 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,972 psi | 60% | 2484 fps | 98.3% |
| Norma 204 | <<locked>> | 98% | 51,663 psi | 79% | 2726 fps | 95.3% |
| Norma URP | <<locked>> | 86% | 34,563 psi | 53% | 2431 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 38,508 psi | 59% | 2497 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 92% | 41,104 psi | 63% | 2575 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 45,847 psi | 71% | 2572 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,208 psi | 70% | 2589 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,574 psi | 76% | 2612 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,774 psi | 41% | 1509 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,445 psi | 79% | 2641 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 40,277 psi | 62% | 2477 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,524 psi | 64% | 2592 fps | 98.4% |
| ReloadSwiss RS 60 | 47.8 gr | 80% | 33,779 psi | 52% | 2464 fps | 99.4% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 33,982 psi | 52% | 2448 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 36,506 psi | 56% | 2503 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 46,905 psi | 72% | 2549 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,017 psi | 63% | 2467 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 34,287 psi | 53% | 2385 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 90% | 45,397 psi | 70% | 2562 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 86% | 38,725 psi | 60% | 2444 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,917 psi | 66% | 2539 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,189 psi | 60% | 2451 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 41,568 psi | 64% | 2523 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 54,433 psi | 84% | 2661 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,259 psi | 54% | 2434 fps | 97.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 54,317 psi | 84% | 2631 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,034 psi | 68% | 2543 fps | 97.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,380 psi | 65% | 2526 fps | 98.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,338 psi | 68% | 2464 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,825 psi | 57% | 2339 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 43,236 psi | 67% | 2490 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 49,661 psi | 76% | 2641 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 43,961 psi | 68% | 2467 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,859 psi | 67% | 2543 fps | 99.1% |
| Somchem S355 | <<locked>> | 80% | 35,201 psi | 54% | 2392 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 25,599 psi | 39% | 2228 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 50,053 psi | 77% | 2520 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,643 psi | 69% | 2457 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,321 psi | 62% | 2448 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,915 psi | 63% | 2457 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,446 psi | 51% | 2333 fps | 98.5% |
| Vihtavuori N160 | <<locked>> | 84% | 33,895 psi | 52% | 2385 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 46,021 psi | 71% | 2559 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 39,450 psi | 61% | 2448 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 35,534 psi | 55% | 2438 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 92% | 31,763 psi | 49% | 2421 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,747 psi | 46% | 2260 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 45,455 psi | 70% | 2602 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 42,076 psi | 65% | 2589 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 96% | 29,820 psi | 46% | 2421 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,814 psi | 64% | 2533 fps | 99.2% |
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 106 powders for .300 Rem. SA Ultra Mag. loaded with the .308 | 178gr | TWENTY-NINE SILENTIO. Alliant Reloder-17 delivers the highest muzzle velocity at 2,897 fps; across all powders the maximum-charge window runs from 1,647 fps to 2,897 fps. Accurate 4350 gives the best case fill at 100 %, and 106 of the 106 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. The 178.0 gr projectile in 0.308" calls for a 1:11.0 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. Alliant Power Pro 2000-MR, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .300 Rem. SA Ultra Mag. with the .308 | 178gr | 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.