Load Specifications
Load data in caliber .308 Win. Ackley Improved with .308 | 143gr | TWENTY-NINE SILENTIO bullet and 77 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 1200-R, Winchester 748 and Accurate 2520.
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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 82% | 51,256 psi | 85% | 2700 fps | 100% |
| Accurate 2015 | <<locked>> | 96% | 52,649 psi | 87% | 2799 fps | 100% |
| Accurate 2230 | <<locked>> | 86% | 51,256 psi | 85% | 2831 fps | 96.2% |
| Accurate 2460 | <<locked>> | 92% | 51,372 psi | 85% | 2812 fps | 99.5% |
| Accurate 2495ᴾ | <<locked>> | 100% | 47,848 psi | 79% | 2792 fps | 100% |
| Accurate 2520 | <<locked>> | 96% | 52,257 psi | 87% | 2864 fps | 99.4% |
| Accurate 4064ᴾ | <<locked>> | 100% | 44,382 psi | 74% | 2766 fps | 99.2% |
| Accurate LT-30 | <<locked>> | 88% | 52,083 psi | 87% | 2720 fps | 100% |
| Accurate LT-32 | <<locked>> | 88% | 52,576 psi | 87% | 2736 fps | 99.3% |
| ADI AR 2206H | <<locked>> | 98% | 51,982 psi | 86% | 2858 fps | 96.9% |
| ADI AR 2207 | <<locked>> | 86% | 52,504 psi | 87% | 2756 fps | 100% |
| ADI AR 2219 | <<locked>> | 90% | 54,418 psi | 90% | 2881 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 96% | 51,851 psi | 86% | 2828 fps | 98.1% |
| Alliant AR-Comp | <<locked>> | 98% | 52,591 psi | 87% | 2877 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 92% | 52,315 psi | 87% | 2923 fps | 97.7% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 44,614 psi | 74% | 2759 fps | 96.4% |
| Alliant Reloder-10x | <<locked>> | 92% | 53,185 psi | 88% | 2822 fps | 100% |
| Alliant Reloder-7 | <<locked>> | 86% | 54,012 psi | 90% | 2769 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 90% | 54,085 psi | 90% | 2762 fps | 100% |
| Bofors RP3ᴾ | <<locked>> | 100% | 44,048 psi | 73% | 2759 fps | 96.3% |
| Hodgdon Benchmark | <<locked>> | 94% | 51,561 psi | 86% | 2776 fps | 98.5% |
| Hodgdon BL-C2 | <<locked>> | 98% | 52,765 psi | 88% | 2897 fps | 98.7% |
| Hodgdon CFE223 | <<locked>> | 94% | 51,648 psi | 86% | 2927 fps | 96.2% |
| Hodgdon H322 | <<locked>> | 92% | 52,518 psi | 87% | 2854 fps | 100% |
| Hodgdon H335 | <<locked>> | 92% | 53,635 psi | 89% | 2874 fps | 99.8% |
| Hodgdon H4198 | <<locked>> | 86% | 54,070 psi | 90% | 2769 fps | 99.9% |
| Hodgdon H4895 | <<locked>> | 98% | 52,257 psi | 87% | 2871 fps | 97.5% |
| Hodgdon LEVERevolutionᴾ | <<locked>> | 100% | 50,343 psi | 84% | 2887 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,996 psi | 55% | 1696 fps | 100% |
| Hodgdon VARGETᴾ | <<locked>> | 100% | 54,244 psi | 90% | 2877 fps | 97.7% |
| IMR 3031ᴾ | <<locked>> | 100% | 53,461 psi | 89% | 2927 fps | 100% |
| IMR 4198 | <<locked>> | 92% | 54,201 psi | 90% | 2789 fps | 100% |
| IMR 4227 | <<locked>> | 82% | 53,882 psi | 90% | 2713 fps | 100% |
| IMR 4895ᴾ | <<locked>> | 100% | 49,966 psi | 83% | 2864 fps | 96.6% |
| IMR 8208 XBR | <<locked>> | 96% | 51,851 psi | 86% | 2828 fps | 98.1% |
| Lovex D073.4 | <<locked>> | 86% | 52,011 psi | 86% | 2831 fps | 99.2% |
| Lovex D073.5 | <<locked>> | 92% | 51,561 psi | 86% | 2818 fps | 98.7% |
| Lovex D073.6ᴾ | <<locked>> | 100% | 53,026 psi | 88% | 2887 fps | 99.4% |
| Lovex S053 | <<locked>> | 82% | 52,663 psi | 87% | 2657 fps | 100% |
| Lovex S060 | <<locked>> | 98% | 53,534 psi | 89% | 2799 fps | 97.1% |
| Lovex S062ᴾ | <<locked>> | 100% | 47,964 psi | 80% | 2779 fps | 97.5% |
| Norma 200 | <<locked>> | 88% | 53,490 psi | 89% | 2802 fps | 100% |
| Norma 201ᴾ | <<locked>> | 100% | 53,780 psi | 89% | 2858 fps | 98.4% |
| Norma 202ᴾ | <<locked>> | 100% | 53,998 psi | 90% | 2877 fps | 99.8% |
| Norma 203Bᴾ | <<locked>> | 100% | 47,819 psi | 79% | 2812 fps | 96.1% |
| Ramshot Wild Boar | <<locked>> | 96% | 51,010 psi | 85% | 2844 fps | 96.6% |
| Ramshot X-Terminator | <<locked>> | 94% | 54,070 psi | 90% | 2831 fps | 97% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,025 psi | 55% | 1736 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 82% | 54,186 psi | 90% | 2753 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 92% | 52,083 psi | 87% | 2828 fps | 99.1% |
| ReloadSwiss RS 52ᴾ | <<locked>> | 100% | 51,300 psi | 85% | 2936 fps | 96.1% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 42,960 psi | 71% | 2789 fps | 97.3% |
| Rottweil R 901 | <<locked>> | 96% | 51,924 psi | 86% | 2815 fps | 99.5% |
| Rottweil R 902ᴾ | <<locked>> | 100% | 50,894 psi | 85% | 2802 fps | 97.9% |
| Shooters World AR Plus | <<locked>> | 86% | 52,011 psi | 86% | 2831 fps | 99.2% |
| Shooters World Match Rifleᴾ | <<locked>> | 100% | 53,026 psi | 88% | 2887 fps | 99.4% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 47,964 psi | 80% | 2779 fps | 97.5% |
| Shooters World Tactical Rifle | <<locked>> | 90% | 52,547 psi | 87% | 2792 fps | 97.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 86% | 53,214 psi | 88% | 2507 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 88% | 51,358 psi | 85% | 2831 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 92% | 54,302 psi | 90% | 2838 fps | 100% |
| SNPE Vectan SP 9ᴾ | <<locked>> | 100% | 53,650 psi | 89% | 2877 fps | 97.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 98% | 53,766 psi | 89% | 2779 fps | 99.7% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 46,209 psi | 77% | 2674 fps | 99.6% |
| Somchem S321 | <<locked>> | 94% | 52,736 psi | 88% | 2864 fps | 98.5% |
| Somchem S335 | <<locked>> | 98% | 52,214 psi | 87% | 2776 fps | 99.9% |
| Somchem S341 | <<locked>> | 98% | 52,750 psi | 88% | 2844 fps | 96.8% |
| Vihtavuori N120 | <<locked>> | 86% | 52,533 psi | 87% | 2707 fps | 100% |
| Vihtavuori N130 | <<locked>> | 94% | 53,722 psi | 89% | 2769 fps | 100% |
| Vihtavuori N133 | <<locked>> | 98% | 53,011 psi | 88% | 2772 fps | 100% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 48,544 psi | 81% | 2792 fps | 100% |
| Vihtavuori N140ᴾ | <<locked>> | 100% | 50,981 psi | 85% | 2805 fps | 99.7% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 40,814 psi | 68% | 2641 fps | 96.3% |
| Vihtavuori N530 | <<locked>> | 96% | 52,576 psi | 87% | 2828 fps | 98.2% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 49,298 psi | 82% | 2795 fps | 99.3% |
| Winchester 748 | <<locked>> | 98% | 53,853 psi | 89% | 2920 fps | 99.1% |
| Winchester StaBALL Matchᴾ | <<locked>> | 100% | 52,881 psi | 88% | 2884 fps | 97.6% |
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 1680 | <<locked>> | 80% | 47,863 psi | 80% | 2651 fps | 100% |
| Accurate 2015 | <<locked>> | 80% | 32,097 psi | 53% | 2425 fps | 98.3% |
| Accurate 2230 | <<locked>> | 84% | 47,732 psi | 79% | 2772 fps | 95.4% |
| Accurate 2460 | <<locked>> | 80% | 34,287 psi | 57% | 2493 fps | 96.2% |
| Accurate 2495 | <<locked>> | 80% | 24,598 psi | 41% | 2293 fps | 96% |
| Accurate 2520 | 40.8 gr | 84% | 34,301 psi | 57% | 2536 fps | 95.7% |
| Accurate 4064 | <<locked>> | 88% | 30,226 psi | 50% | 2464 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 40,727 psi | 68% | 2530 fps | 99% |
| Accurate LT-32 | <<locked>> | 80% | 41,089 psi | 68% | 2536 fps | 97.5% |
| ADI AR 2206H | <<locked>> | 94% | 46,006 psi | 76% | 2756 fps | 95.6% |
| ADI AR 2207 | <<locked>> | 80% | 43,671 psi | 73% | 2621 fps | 100% |
| ADI AR 2219 | <<locked>> | 80% | 38,696 psi | 64% | 2612 fps | 98.6% |
| ADI Benchmark 8208 | <<locked>> | 88% | 40,364 psi | 67% | 2621 fps | 95.5% |
| Alliant AR-Comp | <<locked>> | 80% | 29,399 psi | 49% | 2441 fps | 99.5% |
| Alliant Power Pro 1200-R | 39.7 gr | 86% | 43,163 psi | 72% | 2759 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 41,887 psi | 70% | 2707 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 36,825 psi | 61% | 2543 fps | 99.8% |
| Alliant Reloder-7 | <<locked>> | 80% | 44,846 psi | 75% | 2631 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 39,204 psi | 65% | 2520 fps | 99% |
| Bofors RP3 | <<locked>> | 98% | 41,220 psi | 68% | 2707 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 84% | 38,029 psi | 63% | 2526 fps | 95.5% |
| Hodgdon BL-C2 | <<locked>> | 88% | 37,521 psi | 62% | 2621 fps | 95.4% |
| Hodgdon CFE223 | <<locked>> | 92% | 48,283 psi | 80% | 2867 fps | 95.3% |
| Hodgdon H322 | <<locked>> | 80% | 35,491 psi | 59% | 2543 fps | 97.8% |
| Hodgdon H335 | <<locked>> | 80% | 35,694 psi | 59% | 2549 fps | 96.9% |
| Hodgdon H4198 | <<locked>> | 80% | 44,889 psi | 75% | 2621 fps | 99.2% |
| Hodgdon H4895 | <<locked>> | 92% | 43,178 psi | 72% | 2710 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 41,423 psi | 69% | 2720 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,381 psi | 41% | 1516 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 42,148 psi | 70% | 2667 fps | 95% |
| IMR 3031 | <<locked>> | 80% | 28,210 psi | 47% | 2411 fps | 96.1% |
| IMR 4198 | <<locked>> | 80% | 38,290 psi | 64% | 2530 fps | 100% |
| IMR 4227 | <<locked>> | 80% | 50,908 psi | 85% | 2671 fps | 100% |
| IMR 4895 | <<locked>> | 96% | 44,106 psi | 73% | 2759 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 88% | 40,364 psi | 67% | 2621 fps | 95.5% |
| Lovex D073.4 | <<locked>> | 80% | 41,959 psi | 70% | 2657 fps | 97.6% |
| Lovex D073.5 | <<locked>> | 82% | 36,666 psi | 61% | 2546 fps | 95.5% |
| Lovex D073.6 | <<locked>> | 86% | 32,996 psi | 55% | 2516 fps | 95.2% |
| Lovex S053 | <<locked>> | 80% | 49,821 psi | 83% | 2618 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 44,744 psi | 74% | 2651 fps | 95.2% |
| Lovex S062 | <<locked>> | 94% | 39,871 psi | 66% | 2628 fps | 95.5% |
| Norma 200 | <<locked>> | 80% | 41,669 psi | 69% | 2615 fps | 100% |
| Norma 201 | <<locked>> | 90% | 39,537 psi | 66% | 2605 fps | 95.4% |
| Norma 202 | <<locked>> | 82% | 30,472 psi | 51% | 2421 fps | 95% |
| Norma 203B | <<locked>> | 98% | 44,918 psi | 75% | 2762 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 92% | 44,512 psi | 74% | 2733 fps | 95% |
| Ramshot X-Terminator | <<locked>> | 90% | 47,384 psi | 79% | 2723 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,526 psi | 41% | 1555 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 50,923 psi | 85% | 2707 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 35,215 psi | 59% | 2510 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 98% | 48,124 psi | 80% | 2877 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 37,550 psi | 62% | 2664 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 32,111 psi | 53% | 2421 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 92% | 39,784 psi | 66% | 2602 fps | 95.4% |
| Shooters World AR Plus | <<locked>> | 80% | 41,959 psi | 70% | 2657 fps | 97.6% |
| Shooters World Match Rifle | <<locked>> | 86% | 32,996 psi | 55% | 2516 fps | 95.2% |
| Shooters World Precision | <<locked>> | 94% | 39,871 psi | 66% | 2628 fps | 95.5% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 42,946 psi | 71% | 2628 fps | 95.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 45,672 psi | 76% | 2408 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 39,160 psi | 65% | 2615 fps | 97.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 37,434 psi | 62% | 2549 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 44,396 psi | 74% | 2720 fps | 95% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 30,966 psi | 51% | 2349 fps | 95.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 28,195 psi | 47% | 2300 fps | 95.2% |
| Somchem S321 | <<locked>> | 84% | 37,797 psi | 63% | 2592 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 30,226 psi | 50% | 2352 fps | 95.9% |
| Somchem S341 | <<locked>> | 94% | 45,963 psi | 76% | 2733 fps | 95.3% |
| Vihtavuori N120 | <<locked>> | 80% | 43,758 psi | 73% | 2579 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 35,230 psi | 59% | 2454 fps | 99.5% |
| Vihtavuori N133 | <<locked>> | 80% | 30,690 psi | 51% | 2365 fps | 97.8% |
| Vihtavuori N135 | <<locked>> | 80% | 25,773 psi | 43% | 2310 fps | 96.3% |
| Vihtavuori N140 | <<locked>> | 84% | 30,719 psi | 51% | 2408 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 98% | 38,276 psi | 64% | 2592 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 88% | 40,248 psi | 67% | 2615 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 86% | 31,415 psi | 52% | 2441 fps | 95.2% |
| Winchester 748 | 41.5 gr | 86% | 36,187 psi | 60% | 2592 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 94% | 43,323 psi | 72% | 2720 fps | 95.5% |
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 77 powders for .308 Win. Ackley Improved loaded with the .308 | 143gr | TWENTY-NINE SILENTIO. ReloadSwiss RS 52 delivers the highest muzzle velocity at 2,936 fps; across all powders the maximum-charge window runs from 1,696 fps to 2,936 fps. Accurate 2495 gives the best case fill at 100 %, and 77 of the 77 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (415 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 143.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 2495, Accurate 4064, Alliant Reloder- TS 15.5 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 1200-R, Winchester 748, Accurate 2520 rank at the top here: for .308 Win. Ackley Improved with the .308 | 143gr | 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.