Load Specifications
Load data in caliber .308 Win. Ackley Improved with .308 | 150gr | Lapua Mega bullet and 81 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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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>> | 82% | 51,155 psi | 85% | 2621 fps | 100% |
| Accurate 2015 | <<locked>> | 96% | 52,982 psi | 88% | 2723 fps | 100% |
| Accurate 2200 | <<locked>> | 86% | 51,401 psi | 85% | 2749 fps | 96.1% |
| Accurate 2230 | <<locked>> | 86% | 51,619 psi | 86% | 2759 fps | 96.5% |
| Accurate 2460 | <<locked>> | 92% | 51,996 psi | 86% | 2743 fps | 99.6% |
| Accurate 2495ᴾ | <<locked>> | 100% | 48,153 psi | 80% | 2720 fps | 100% |
| Accurate 2520 | <<locked>> | 96% | 52,301 psi | 87% | 2789 fps | 99.5% |
| Accurate 4064ᴾ | <<locked>> | 100% | 44,672 psi | 74% | 2694 fps | 99.4% |
| Accurate LT-30 | <<locked>> | 88% | 52,344 psi | 87% | 2644 fps | 100% |
| Accurate LT-32 | <<locked>> | 88% | 52,794 psi | 88% | 2661 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 98% | 52,170 psi | 87% | 2782 fps | 97.2% |
| ADI AR 2207 | <<locked>> | 86% | 52,547 psi | 87% | 2674 fps | 100% |
| ADI AR 2219 | <<locked>> | 90% | 54,389 psi | 90% | 2799 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 96% | 52,011 psi | 86% | 2753 fps | 98.3% |
| Alliant AR-Comp | <<locked>> | 98% | 53,084 psi | 88% | 2802 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 92% | 52,678 psi | 88% | 2848 fps | 98% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 44,585 psi | 74% | 2684 fps | 96.7% |
| Alliant Reloder-10x | <<locked>> | 92% | 53,577 psi | 89% | 2746 fps | 100% |
| Alliant Reloder-15ᴾ | <<locked>> | 100% | 49,211 psi | 82% | 2756 fps | 96% |
| Alliant Reloder-7 | <<locked>> | 86% | 54,172 psi | 90% | 2690 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 90% | 54,244 psi | 90% | 2687 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 98% | 51,851 psi | 86% | 2785 fps | 95.8% |
| Bofors RP3ᴾ | <<locked>> | 100% | 44,440 psi | 74% | 2694 fps | 96.7% |
| Hodgdon Benchmark | <<locked>> | 94% | 51,909 psi | 86% | 2703 fps | 98.7% |
| Hodgdon BL-C2 | <<locked>> | 98% | 53,026 psi | 88% | 2825 fps | 98.9% |
| Hodgdon CFE223 | <<locked>> | 94% | 51,764 psi | 86% | 2851 fps | 96.5% |
| Hodgdon H322 | <<locked>> | 92% | 52,823 psi | 88% | 2776 fps | 100% |
| Hodgdon H335 | <<locked>> | 92% | 53,838 psi | 89% | 2799 fps | 99.8% |
| Hodgdon H4198 | <<locked>> | 86% | 54,172 psi | 90% | 2690 fps | 100% |
| Hodgdon H4895 | <<locked>> | 98% | 52,547 psi | 87% | 2795 fps | 97.8% |
| Hodgdon LEVERevolutionᴾ | <<locked>> | 100% | 50,604 psi | 84% | 2815 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,098 psi | 55% | 1644 fps | 100% |
| Hodgdon VARGETᴾ | <<locked>> | 100% | 54,259 psi | 90% | 2799 fps | 98% |
| IMR 3031ᴾ | <<locked>> | 100% | 53,679 psi | 89% | 2844 fps | 100% |
| IMR 4064ᴾ | <<locked>> | 100% | 49,501 psi | 82% | 2707 fps | 96.1% |
| IMR 4198 | <<locked>> | 90% | 51,663 psi | 86% | 2674 fps | 100% |
| IMR 4227 | <<locked>> | 82% | 54,389 psi | 90% | 2638 fps | 100% |
| IMR 4895ᴾ | <<locked>> | 100% | 50,270 psi | 84% | 2789 fps | 97% |
| IMR 8208 XBR | <<locked>> | 96% | 52,011 psi | 86% | 2753 fps | 98.3% |
| Lovex D073.4 | <<locked>> | 86% | 52,344 psi | 87% | 2756 fps | 99.4% |
| Lovex D073.5 | <<locked>> | 92% | 51,866 psi | 86% | 2746 fps | 99% |
| Lovex D073.6ᴾ | <<locked>> | 100% | 53,200 psi | 88% | 2812 fps | 99.6% |
| Lovex S053 | <<locked>> | 82% | 53,055 psi | 88% | 2582 fps | 100% |
| Lovex S060 | <<locked>> | 98% | 53,621 psi | 89% | 2723 fps | 97.4% |
| Lovex S062ᴾ | <<locked>> | 100% | 48,196 psi | 80% | 2707 fps | 97.8% |
| Norma 200 | <<locked>> | 88% | 53,824 psi | 89% | 2726 fps | 100% |
| Norma 201ᴾ | <<locked>> | 100% | 54,056 psi | 90% | 2782 fps | 98.6% |
| Norma 202ᴾ | <<locked>> | 100% | 53,911 psi | 90% | 2795 fps | 99.9% |
| Norma 203Bᴾ | <<locked>> | 100% | 48,196 psi | 80% | 2746 fps | 96.5% |
| Ramshot Big Gameᴾ | <<locked>> | 100% | 48,834 psi | 81% | 2762 fps | 96.1% |
| Ramshot Wild Boar | <<locked>> | 96% | 51,111 psi | 85% | 2772 fps | 96.9% |
| Ramshot X-Terminator | <<locked>> | 94% | 54,027 psi | 90% | 2753 fps | 97.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,170 psi | 55% | 1683 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 92% | 52,069 psi | 87% | 2749 fps | 99.3% |
| ReloadSwiss RS 52ᴾ | <<locked>> | 100% | 51,474 psi | 86% | 2861 fps | 96.5% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 43,149 psi | 72% | 2720 fps | 97.6% |
| Rottweil R 901 | <<locked>> | 96% | 52,199 psi | 87% | 2740 fps | 99.7% |
| Rottweil R 902ᴾ | <<locked>> | 100% | 51,082 psi | 85% | 2730 fps | 98.2% |
| Shooters World AR Plus | <<locked>> | 86% | 52,344 psi | 87% | 2756 fps | 99.4% |
| Shooters World Match Rifleᴾ | <<locked>> | 100% | 53,200 psi | 88% | 2812 fps | 99.6% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 48,196 psi | 80% | 2707 fps | 97.8% |
| Shooters World Tactical Rifle | <<locked>> | 90% | 52,649 psi | 87% | 2717 fps | 98% |
| SNPE Vectan BA6 1/2 | <<locked>> | 86% | 53,737 psi | 89% | 2438 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 88% | 51,416 psi | 85% | 2756 fps | 99.7% |
| SNPE Vectan SP 3 | <<locked>> | 90% | 51,271 psi | 85% | 2713 fps | 100% |
| SNPE Vectan SP 9ᴾ | <<locked>> | 100% | 53,809 psi | 89% | 2802 fps | 97.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 98% | 54,070 psi | 90% | 2703 fps | 99.8% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 46,659 psi | 78% | 2608 fps | 99.7% |
| Somchem S321 | <<locked>> | 94% | 53,229 psi | 88% | 2792 fps | 98.7% |
| Somchem S335 | <<locked>> | 98% | 52,301 psi | 87% | 2700 fps | 99.9% |
| Somchem S341 | <<locked>> | 98% | 52,997 psi | 88% | 2772 fps | 97.1% |
| Vihtavuori N120 | <<locked>> | 86% | 52,576 psi | 87% | 2625 fps | 100% |
| Vihtavuori N130 | <<locked>> | 94% | 53,882 psi | 90% | 2694 fps | 100% |
| Vihtavuori N133 | <<locked>> | 98% | 53,345 psi | 89% | 2697 fps | 100% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 48,979 psi | 81% | 2720 fps | 100% |
| Vihtavuori N140ᴾ | <<locked>> | 100% | 51,343 psi | 85% | 2730 fps | 99.8% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 41,104 psi | 68% | 2575 fps | 96.7% |
| Vihtavuori N530 | <<locked>> | 96% | 52,837 psi | 88% | 2756 fps | 98.4% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 49,443 psi | 82% | 2723 fps | 99.5% |
| Winchester 748 | <<locked>> | 98% | 53,969 psi | 90% | 2841 fps | 99.3% |
| Winchester StaBALL Matchᴾ | <<locked>> | 100% | 53,127 psi | 88% | 2812 fps | 97.9% |
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% | 48,008 psi | 80% | 2575 fps | 100% |
| Accurate 2015 | <<locked>> | 80% | 32,271 psi | 54% | 2359 fps | 98.6% |
| Accurate 2200 | <<locked>> | 84% | 48,153 psi | 80% | 2697 fps | 95.3% |
| Accurate 2230 | <<locked>> | 82% | 44,875 psi | 75% | 2644 fps | 95% |
| Accurate 2460 | <<locked>> | 80% | 34,461 psi | 57% | 2431 fps | 96.6% |
| Accurate 2495 | <<locked>> | 80% | 24,816 psi | 41% | 2238 fps | 96.5% |
| Accurate 2520 | 38.5 gr | 82% | 32,198 psi | 53% | 2418 fps | 95.3% |
| Accurate 4064 | <<locked>> | 86% | 28,572 psi | 47% | 2352 fps | 95.3% |
| Accurate LT-30 | <<locked>> | 80% | 40,915 psi | 68% | 2457 fps | 99.2% |
| Accurate LT-32 | <<locked>> | 80% | 41,234 psi | 69% | 2467 fps | 97.8% |
| ADI AR 2206H | <<locked>> | 92% | 43,250 psi | 72% | 2628 fps | 95.1% |
| ADI AR 2207 | <<locked>> | 80% | 43,743 psi | 73% | 2546 fps | 100% |
| ADI AR 2219 | <<locked>> | 80% | 38,798 psi | 64% | 2539 fps | 98.8% |
| ADI Benchmark 8208 | <<locked>> | 86% | 38,000 psi | 63% | 2500 fps | 95.1% |
| Alliant AR-Comp | <<locked>> | 80% | 29,559 psi | 49% | 2379 fps | 99.7% |
| Alliant Power Pro 1200-R | 37.4 gr | 84% | 40,422 psi | 67% | 2628 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 39,479 psi | 66% | 2585 fps | 95.3% |
| Alliant Reloder-10x | <<locked>> | 80% | 36,970 psi | 61% | 2470 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 98% | 46,122 psi | 77% | 2703 fps | 95.3% |
| Alliant Reloder-7 | <<locked>> | 80% | 45,063 psi | 75% | 2559 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 39,407 psi | 65% | 2454 fps | 99.2% |
| Baschieri & Pellagri 107 | <<locked>> | 96% | 48,399 psi | 80% | 2730 fps | 95% |
| Bofors RP3 | <<locked>> | 96% | 38,841 psi | 65% | 2589 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 82% | 36,100 psi | 60% | 2415 fps | 95.2% |
| Hodgdon BL-C2 | <<locked>> | 86% | 35,186 psi | 58% | 2500 fps | 95% |
| Hodgdon CFE223 | <<locked>> | 92% | 48,312 psi | 80% | 2792 fps | 95.7% |
| Hodgdon H322 | <<locked>> | 80% | 35,505 psi | 59% | 2470 fps | 98.1% |
| Hodgdon H335 | <<locked>> | 80% | 35,926 psi | 60% | 2484 fps | 97.2% |
| Hodgdon H4198 | <<locked>> | 80% | 45,049 psi | 75% | 2549 fps | 99.4% |
| Hodgdon H4895 | <<locked>> | 90% | 40,741 psi | 68% | 2589 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 41,669 psi | 69% | 2651 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,468 psi | 41% | 1467 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 42,366 psi | 70% | 2598 fps | 95.4% |
| IMR 3031 | <<locked>> | 80% | 28,369 psi | 47% | 2352 fps | 96.6% |
| IMR 4064 | <<locked>> | 98% | 46,354 psi | 77% | 2654 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 38,537 psi | 64% | 2461 fps | 100% |
| IMR 4227 | <<locked>> | 80% | 50,879 psi | 85% | 2592 fps | 100% |
| IMR 4895 | <<locked>> | 96% | 44,222 psi | 73% | 2684 fps | 95.6% |
| IMR 8208 XBR | <<locked>> | 86% | 38,000 psi | 63% | 2500 fps | 95.1% |
| Lovex D073.4 | <<locked>> | 80% | 42,264 psi | 70% | 2592 fps | 97.9% |
| Lovex D073.5 | <<locked>> | 80% | 34,461 psi | 57% | 2428 fps | 95.1% |
| Lovex D073.6 | <<locked>> | 86% | 33,156 psi | 55% | 2451 fps | 95.7% |
| Lovex S053 | <<locked>> | 80% | 50,082 psi | 83% | 2543 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 44,918 psi | 75% | 2582 fps | 95.5% |
| Lovex S062 | <<locked>> | 92% | 37,623 psi | 63% | 2510 fps | 95.2% |
| Norma 200 | <<locked>> | 80% | 41,945 psi | 70% | 2546 fps | 100% |
| Norma 201 | <<locked>> | 88% | 37,405 psi | 62% | 2490 fps | 95% |
| Norma 202 | <<locked>> | 82% | 30,748 psi | 51% | 2362 fps | 95.5% |
| Norma 203B | <<locked>> | 96% | 42,380 psi | 70% | 2641 fps | 95% |
| Ramshot Big Game | <<locked>> | 98% | 45,600 psi | 76% | 2703 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 92% | 44,773 psi | 74% | 2664 fps | 95.4% |
| Ramshot X-Terminator | <<locked>> | 88% | 44,701 psi | 74% | 2602 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,395 psi | 41% | 1499 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 35,549 psi | 59% | 2448 fps | 96% |
| ReloadSwiss RS 52 | <<locked>> | 98% | 48,225 psi | 80% | 2802 fps | 95.7% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 37,869 psi | 63% | 2605 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 32,474 psi | 54% | 2362 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 90% | 37,666 psi | 63% | 2487 fps | 95.1% |
| Shooters World AR Plus | <<locked>> | 80% | 42,264 psi | 70% | 2592 fps | 97.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 33,156 psi | 55% | 2451 fps | 95.7% |
| Shooters World Precision | <<locked>> | 92% | 37,623 psi | 63% | 2510 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 40,103 psi | 67% | 2503 fps | 95.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 45,948 psi | 76% | 2336 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 39,436 psi | 66% | 2546 fps | 98% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 37,536 psi | 62% | 2477 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 44,585 psi | 74% | 2651 fps | 95.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 31,024 psi | 52% | 2283 fps | 95.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 28,384 psi | 47% | 2241 fps | 95.7% |
| Somchem S321 | <<locked>> | 84% | 37,956 psi | 63% | 2526 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 30,414 psi | 51% | 2290 fps | 96.3% |
| Somchem S341 | <<locked>> | 94% | 46,354 psi | 77% | 2667 fps | 95.7% |
| Vihtavuori N120 | <<locked>> | 80% | 43,845 psi | 73% | 2503 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 35,346 psi | 59% | 2385 fps | 99.6% |
| Vihtavuori N133 | <<locked>> | 80% | 30,806 psi | 51% | 2300 fps | 98.1% |
| Vihtavuori N135 | <<locked>> | 80% | 25,904 psi | 43% | 2251 fps | 96.7% |
| Vihtavuori N140 | <<locked>> | 82% | 29,138 psi | 48% | 2303 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 96% | 36,027 psi | 60% | 2474 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 86% | 38,072 psi | 63% | 2497 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 86% | 31,691 psi | 53% | 2382 fps | 95.6% |
| Winchester 748 | 40.1 gr | 86% | 36,318 psi | 60% | 2523 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 92% | 40,640 psi | 68% | 2595 fps | 95.1% |
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 81 powders for .308 Win. Ackley Improved loaded with the .308 | 150gr | Lapua Mega. ReloadSwiss RS 52 delivers the highest muzzle velocity at 2,861 fps; across all powders the maximum-charge window runs from 1,644 fps to 2,861 fps. Accurate 2495 gives the best case fill at 100 %, and 81 of the 81 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 150.0 gr projectile in 0.308" calls for a 1:11.5 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 | 150gr | Lapua Mega 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.