Load Specifications
Load data in caliber .308 Win. Ackley Improved with .308 | 125gr | Sierra MatchKing bullet and 55 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2219, Hodgdon H335 and Somchem S321.
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 1680 | <<locked>> | 86% | 53,766 psi | 89% | 2923 fps | 100% |
| Accurate 2015ᴾ | <<locked>> | 100% | 54,331 psi | 90% | 3015 fps | 100% |
| Accurate 2460 | <<locked>> | 96% | 53,330 psi | 89% | 3025 fps | 98.9% |
| Accurate 2495ᴾ | <<locked>> | 100% | 42,264 psi | 70% | 2884 fps | 99.5% |
| Accurate 2520ᴾ | <<locked>> | 100% | 53,853 psi | 89% | 3071 fps | 98.7% |
| Accurate 4064ᴾ | <<locked>> | 100% | 39,276 psi | 65% | 2844 fps | 97.1% |
| Accurate LT-30 | <<locked>> | 92% | 54,418 psi | 90% | 2936 fps | 99.7% |
| Accurate LT-32 | <<locked>> | 90% | 51,692 psi | 86% | 2897 fps | 98.3% |
| ADI AR 2207 | <<locked>> | 90% | 54,186 psi | 90% | 2982 fps | 100% |
| ADI AR 2219 | <<locked>> | 92% | 52,692 psi | 88% | 3045 fps | 99.5% |
| ADI Benchmark 8208ᴾ | <<locked>> | 100% | 53,359 psi | 89% | 3028 fps | 97% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 50,386 psi | 84% | 3045 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 96% | 54,027 psi | 90% | 3140 fps | 96.6% |
| Alliant Reloder-10x | <<locked>> | 94% | 51,488 psi | 86% | 2992 fps | 100% |
| Alliant Reloder-7 | <<locked>> | 88% | 52,765 psi | 88% | 2946 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 92% | 53,084 psi | 88% | 2930 fps | 99.7% |
| Hodgdon Benchmark | <<locked>> | 98% | 53,447 psi | 89% | 2982 fps | 97.6% |
| Hodgdon BL-C2ᴾ | <<locked>> | 100% | 51,053 psi | 85% | 3051 fps | 97.3% |
| Hodgdon H322 | <<locked>> | 96% | 54,215 psi | 90% | 3071 fps | 99.7% |
| Hodgdon H335 | <<locked>> | 94% | 52,011 psi | 86% | 3035 fps | 98.9% |
| Hodgdon H4198 | <<locked>> | 88% | 53,229 psi | 88% | 2940 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,474 psi | 54% | 1818 fps | 100% |
| IMR 3031ᴾ | <<locked>> | 100% | 48,008 psi | 80% | 3031 fps | 99.6% |
| IMR 4198 | <<locked>> | 94% | 53,040 psi | 88% | 2969 fps | 100% |
| IMR 4227 | <<locked>> | 84% | 53,142 psi | 88% | 2897 fps | 100% |
| IMR 8208 XBRᴾ | <<locked>> | 100% | 53,359 psi | 89% | 3028 fps | 97% |
| Lovex D073.4 | <<locked>> | 90% | 54,302 psi | 90% | 3051 fps | 98.5% |
| Lovex D073.5 | <<locked>> | 96% | 53,447 psi | 89% | 3025 fps | 97.9% |
| Lovex D073.6ᴾ | <<locked>> | 100% | 47,485 psi | 79% | 2982 fps | 97.7% |
| Lovex S053 | <<locked>> | 84% | 51,895 psi | 86% | 2844 fps | 100% |
| Norma 200 | <<locked>> | 90% | 51,735 psi | 86% | 2972 fps | 100% |
| Norma 201ᴾ | <<locked>> | 100% | 48,820 psi | 81% | 2953 fps | 96.2% |
| Norma 202ᴾ | <<locked>> | 100% | 48,820 psi | 81% | 2979 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,358 psi | 54% | 1860 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 84% | 53,301 psi | 89% | 2936 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 96% | 53,693 psi | 89% | 3038 fps | 98.3% |
| Rottweil R 901ᴾ | <<locked>> | 100% | 53,069 psi | 88% | 3018 fps | 98.8% |
| Shooters World AR Plus | <<locked>> | 90% | 54,302 psi | 90% | 3051 fps | 98.5% |
| Shooters World Match Rifleᴾ | <<locked>> | 100% | 47,485 psi | 79% | 2982 fps | 97.7% |
| Shooters World Tactical Rifle | <<locked>> | 92% | 51,430 psi | 85% | 2946 fps | 96.1% |
| SNPE Vectan BA6 1/2 | <<locked>> | 88% | 52,504 psi | 87% | 2690 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 92% | 53,069 psi | 88% | 3045 fps | 99% |
| SNPE Vectan SP 3 | <<locked>> | 94% | 52,518 psi | 87% | 3002 fps | 99.8% |
| SNPE Vectan Tubal 3000ᴾ | <<locked>> | 100% | 52,547 psi | 87% | 2940 fps | 98.8% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 42,061 psi | 70% | 2772 fps | 98% |
| Somchem S321 | <<locked>> | 96% | 51,401 psi | 85% | 3018 fps | 97% |
| Somchem S335ᴾ | <<locked>> | 100% | 50,604 psi | 84% | 2933 fps | 99.2% |
| Vihtavuori N120 | <<locked>> | 90% | 54,201 psi | 90% | 2930 fps | 100% |
| Vihtavuori N130 | <<locked>> | 96% | 52,243 psi | 87% | 2940 fps | 100% |
| Vihtavuori N133ᴾ | <<locked>> | 100% | 51,547 psi | 86% | 2940 fps | 99.9% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 43,424 psi | 72% | 2894 fps | 99.6% |
| Vihtavuori N140ᴾ | <<locked>> | 100% | 46,035 psi | 76% | 2904 fps | 98.3% |
| Vihtavuori N530ᴾ | <<locked>> | 100% | 54,259 psi | 90% | 3031 fps | 97.2% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 44,730 psi | 74% | 2894 fps | 97.6% |
| Winchester 748ᴾ | <<locked>> | 100% | 51,996 psi | 86% | 3071 fps | 97.7% |
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% | 44,222 psi | 73% | 2769 fps | 99.9% |
| Accurate 2015 | <<locked>> | 80% | 28,863 psi | 48% | 2503 fps | 95.8% |
| Accurate 2460 | <<locked>> | 86% | 37,942 psi | 63% | 2743 fps | 95.7% |
| Accurate 2495 | <<locked>> | 86% | 26,353 psi | 44% | 2507 fps | 95.2% |
| Accurate 2520 | <<locked>> | 90% | 37,695 psi | 63% | 2776 fps | 95.2% |
| Accurate 4064 | <<locked>> | 96% | 34,563 psi | 57% | 2736 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 37,811 psi | 63% | 2635 fps | 97.2% |
| Accurate LT-32 | <<locked>> | 80% | 38,189 psi | 63% | 2638 fps | 95.2% |
| ADI AR 2207 | <<locked>> | 80% | 39,769 psi | 66% | 2743 fps | 100% |
| ADI AR 2219 | 38.7 gr | 80% | 35,143 psi | 58% | 2700 fps | 96.2% |
| ADI Benchmark 8208 | <<locked>> | 96% | 47,326 psi | 79% | 2923 fps | 95.7% |
| Alliant AR-Comp | <<locked>> | 80% | 26,498 psi | 44% | 2510 fps | 97.4% |
| Alliant Power Pro 1200-R | <<locked>> | 92% | 47,253 psi | 79% | 3018 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 33,330 psi | 55% | 2635 fps | 98.4% |
| Alliant Reloder-7 | <<locked>> | 80% | 41,046 psi | 68% | 2746 fps | 99.8% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 35,940 psi | 60% | 2612 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 92% | 44,541 psi | 74% | 2825 fps | 95.7% |
| Hodgdon BL-C2 | <<locked>> | 96% | 44,367 psi | 74% | 2930 fps | 95.7% |
| Hodgdon H322 | <<locked>> | 80% | 32,111 psi | 53% | 2621 fps | 95% |
| Hodgdon H335 | 42 gr | 84% | 37,028 psi | 62% | 2743 fps | 95.6% |
| Hodgdon H4198 | <<locked>> | 80% | 41,640 psi | 69% | 2730 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,801 psi | 40% | 1621 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 30,676 psi | 51% | 2641 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 35,143 psi | 58% | 2635 fps | 99.4% |
| IMR 4227 | <<locked>> | 80% | 47,108 psi | 78% | 2805 fps | 100% |
| IMR 8208 XBR | <<locked>> | 96% | 47,326 psi | 79% | 2923 fps | 95.7% |
| Lovex D073.4 | <<locked>> | 82% | 40,915 psi | 68% | 2812 fps | 95.8% |
| Lovex D073.5 | <<locked>> | 88% | 40,437 psi | 67% | 2792 fps | 95% |
| Lovex D073.6 | <<locked>> | 94% | 38,580 psi | 64% | 2812 fps | 95.4% |
| Lovex S053 | <<locked>> | 80% | 46,209 psi | 77% | 2756 fps | 100% |
| Norma 200 | <<locked>> | 80% | 37,985 psi | 63% | 2726 fps | 99.6% |
| Norma 201 | <<locked>> | 98% | 45,934 psi | 76% | 2900 fps | 95.4% |
| Norma 202 | <<locked>> | 90% | 35,549 psi | 59% | 2713 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,873 psi | 40% | 1663 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 46,818 psi | 78% | 2835 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 39,030 psi | 65% | 2762 fps | 95% |
| Rottweil R 901 | <<locked>> | 88% | 37,275 psi | 62% | 2713 fps | 95.5% |
| Shooters World AR Plus | <<locked>> | 82% | 40,915 psi | 68% | 2812 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 94% | 38,580 psi | 64% | 2812 fps | 95.4% |
| Shooters World Tactical Rifle | <<locked>> | 90% | 47,993 psi | 80% | 2887 fps | 95.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 42,424 psi | 70% | 2543 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 35,476 psi | 59% | 2700 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 33,866 psi | 56% | 2638 fps | 96.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 36,260 psi | 60% | 2635 fps | 95.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 32,808 psi | 55% | 2569 fps | 95.3% |
| Somchem S321 | 46.4 gr | 92% | 44,933 psi | 75% | 2904 fps | 95.5% |
| Somchem S335 | <<locked>> | 86% | 33,054 psi | 55% | 2579 fps | 95.3% |
| Vihtavuori N120 | <<locked>> | 80% | 39,914 psi | 66% | 2703 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 32,068 psi | 53% | 2546 fps | 97.8% |
| Vihtavuori N133 | <<locked>> | 80% | 27,876 psi | 46% | 2441 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 86% | 27,978 psi | 46% | 2533 fps | 95.6% |
| Vihtavuori N140 | <<locked>> | 92% | 35,781 psi | 59% | 2694 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 94% | 44,556 psi | 74% | 2864 fps | 95% |
| Vihtavuori N540 | <<locked>> | 94% | 36,796 psi | 61% | 2730 fps | 95.4% |
| Winchester 748 | <<locked>> | 94% | 42,728 psi | 71% | 2897 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 87 powders for .308 Win. Ackley Improved loaded with the .308 | 125gr | Sierra MatchKing. Alliant Power Pro 1200-R delivers the highest muzzle velocity at 3,140 fps; across all powders the maximum-charge window runs from 1,818 fps to 3,140 fps. Accurate 2015 gives the best case fill at 100 %, and 87 of the 87 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (415 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 125.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 2015, Accurate 2495, Accurate 2520 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. ADI AR 2219, Hodgdon H335, Somchem S321 rank at the top here: for .308 Win. Ackley Improved with the .308 | 125gr | Sierra MatchKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2200, Accurate 2230, ADI AR 2206H 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.