Load Specifications
Load data in caliber .308 Win. Ackley Improved with .308 | 150gr | Barnes MRX BT 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, Somchem S321 and Winchester 748.
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>> | 84% | 54,056 psi | 90% | 2667 fps | 100% |
| Accurate 2015 | <<locked>> | 96% | 52,141 psi | 87% | 2723 fps | 100% |
| Accurate 2200 | <<locked>> | 88% | 53,925 psi | 90% | 2802 fps | 96.7% |
| Accurate 2230 | <<locked>> | 88% | 54,404 psi | 90% | 2812 fps | 97.1% |
| Accurate 2460 | <<locked>> | 94% | 54,085 psi | 90% | 2782 fps | 99.8% |
| Accurate 2495ᴾ | <<locked>> | 100% | 46,441 psi | 77% | 2707 fps | 100% |
| Accurate 2520 | <<locked>> | 96% | 51,445 psi | 85% | 2785 fps | 99.5% |
| Accurate 4064ᴾ | <<locked>> | 100% | 43,105 psi | 72% | 2677 fps | 99.2% |
| Accurate LT-30 | <<locked>> | 88% | 51,634 psi | 86% | 2644 fps | 100% |
| Accurate LT-32 | <<locked>> | 88% | 52,069 psi | 87% | 2657 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 98% | 51,155 psi | 85% | 2776 fps | 97.1% |
| ADI AR 2207 | <<locked>> | 86% | 51,663 psi | 86% | 2671 fps | 100% |
| ADI AR 2219 | <<locked>> | 90% | 53,896 psi | 90% | 2799 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 98% | 54,375 psi | 90% | 2795 fps | 98.7% |
| Alliant AR-Comp | <<locked>> | 98% | 52,040 psi | 86% | 2795 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 92% | 51,576 psi | 86% | 2844 fps | 97.9% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 43,816 psi | 73% | 2680 fps | 96.6% |
| Alliant Reloder-10x | <<locked>> | 92% | 52,547 psi | 87% | 2740 fps | 100% |
| Alliant Reloder-15ᴾ | <<locked>> | 100% | 48,095 psi | 80% | 2746 fps | 95.9% |
| Alliant Reloder-7 | <<locked>> | 86% | 53,200 psi | 88% | 2687 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 90% | 53,374 psi | 89% | 2684 fps | 100% |
| Bofors RP3ᴾ | <<locked>> | 100% | 43,163 psi | 72% | 2680 fps | 96.5% |
| Hodgdon Benchmark | <<locked>> | 96% | 54,230 psi | 90% | 2746 fps | 99% |
| Hodgdon BL-C2 | <<locked>> | 98% | 52,257 psi | 87% | 2822 fps | 98.9% |
| Hodgdon CFE223 | <<locked>> | 94% | 50,807 psi | 84% | 2844 fps | 96.4% |
| Hodgdon H322 | <<locked>> | 92% | 51,909 psi | 86% | 2772 fps | 100% |
| Hodgdon H335 | <<locked>> | 92% | 53,214 psi | 88% | 2795 fps | 99.8% |
| Hodgdon H4198 | <<locked>> | 86% | 53,490 psi | 89% | 2690 fps | 100% |
| Hodgdon H4895 | <<locked>> | 98% | 51,430 psi | 85% | 2789 fps | 97.7% |
| Hodgdon LEVERevolutionᴾ | <<locked>> | 100% | 49,545 psi | 82% | 2805 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,866 psi | 55% | 1644 fps | 100% |
| Hodgdon VARGETᴾ | <<locked>> | 100% | 53,693 psi | 89% | 2799 fps | 97.9% |
| IMR 3031ᴾ | <<locked>> | 100% | 52,591 psi | 87% | 2841 fps | 100% |
| IMR 4064ᴾ | <<locked>> | 100% | 48,486 psi | 81% | 2700 fps | 95.9% |
| IMR 4198 | <<locked>> | 92% | 54,027 psi | 90% | 2710 fps | 100% |
| IMR 4227 | <<locked>> | 82% | 53,330 psi | 89% | 2631 fps | 100% |
| IMR 4895ᴾ | <<locked>> | 100% | 49,182 psi | 82% | 2782 fps | 96.9% |
| IMR 8208 XBR | <<locked>> | 98% | 54,375 psi | 90% | 2795 fps | 98.7% |
| Lovex D073.4 | <<locked>> | 86% | 51,126 psi | 85% | 2749 fps | 99.3% |
| Lovex D073.5 | <<locked>> | 94% | 54,433 psi | 90% | 2792 fps | 99.3% |
| Lovex D073.6ᴾ | <<locked>> | 100% | 52,330 psi | 87% | 2808 fps | 99.5% |
| Lovex S053 | <<locked>> | 82% | 52,301 psi | 87% | 2582 fps | 100% |
| Lovex S060 | <<locked>> | 98% | 52,707 psi | 88% | 2720 fps | 97.3% |
| Lovex S062ᴾ | <<locked>> | 100% | 47,079 psi | 78% | 2700 fps | 97.7% |
| Norma 200 | <<locked>> | 88% | 52,547 psi | 87% | 2720 fps | 100% |
| Norma 201ᴾ | <<locked>> | 100% | 52,808 psi | 88% | 2776 fps | 98.5% |
| Norma 202ᴾ | <<locked>> | 100% | 53,258 psi | 88% | 2799 fps | 99.8% |
| Norma 203Bᴾ | <<locked>> | 100% | 47,108 psi | 78% | 2736 fps | 96.3% |
| Ramshot Big Gameᴾ | <<locked>> | 100% | 47,848 psi | 79% | 2753 fps | 96% |
| Ramshot Wild Boar | <<locked>> | 98% | 53,766 psi | 89% | 2822 fps | 97.5% |
| Ramshot X-Terminator | <<locked>> | 94% | 53,403 psi | 89% | 2753 fps | 97.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,851 psi | 55% | 1683 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 82% | 53,766 psi | 89% | 2674 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 92% | 51,140 psi | 85% | 2746 fps | 99.2% |
| ReloadSwiss RS 52ᴾ | <<locked>> | 100% | 50,778 psi | 84% | 2858 fps | 96.4% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 42,148 psi | 70% | 2710 fps | 97.5% |
| Rottweil R 901 | <<locked>> | 98% | 53,751 psi | 89% | 2772 fps | 99.8% |
| Rottweil R 902ᴾ | <<locked>> | 100% | 49,835 psi | 83% | 2720 fps | 98.1% |
| Shooters World AR Plus | <<locked>> | 86% | 51,126 psi | 85% | 2749 fps | 99.3% |
| Shooters World Match Rifleᴾ | <<locked>> | 100% | 52,330 psi | 87% | 2808 fps | 99.5% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 47,079 psi | 78% | 2700 fps | 97.7% |
| Shooters World Tactical Rifle | <<locked>> | 90% | 52,040 psi | 86% | 2717 fps | 98% |
| SNPE Vectan BA6 1/2 | <<locked>> | 86% | 52,765 psi | 88% | 2434 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 90% | 54,099 psi | 90% | 2805 fps | 99.8% |
| SNPE Vectan SP 3 | <<locked>> | 92% | 53,867 psi | 89% | 2759 fps | 100% |
| SNPE Vectan SP 9ᴾ | <<locked>> | 100% | 53,127 psi | 88% | 2802 fps | 97.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 98% | 53,084 psi | 88% | 2700 fps | 99.8% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 45,687 psi | 76% | 2602 fps | 99.7% |
| Somchem S321 | <<locked>> | 94% | 52,083 psi | 87% | 2785 fps | 98.6% |
| Somchem S335 | <<locked>> | 98% | 51,590 psi | 86% | 2700 fps | 99.9% |
| Somchem S341 | <<locked>> | 98% | 52,359 psi | 87% | 2769 fps | 97.1% |
| Vihtavuori N120 | <<locked>> | 86% | 51,735 psi | 86% | 2625 fps | 100% |
| Vihtavuori N130 | <<locked>> | 94% | 52,924 psi | 88% | 2687 fps | 100% |
| Vihtavuori N133 | <<locked>> | 98% | 52,460 psi | 87% | 2697 fps | 100% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 47,848 psi | 79% | 2713 fps | 100% |
| Vihtavuori N140ᴾ | <<locked>> | 100% | 50,256 psi | 83% | 2726 fps | 99.8% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 40,001 psi | 66% | 2566 fps | 96.5% |
| Vihtavuori N530 | <<locked>> | 96% | 51,750 psi | 86% | 2749 fps | 98.4% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 48,689 psi | 81% | 2720 fps | 99.4% |
| Winchester 748 | <<locked>> | 98% | 53,301 psi | 89% | 2841 fps | 99.2% |
| Winchester StaBALL Matchᴾ | <<locked>> | 100% | 52,489 psi | 87% | 2808 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% | 47,224 psi | 78% | 2572 fps | 100% |
| Accurate 2015 | <<locked>> | 80% | 31,169 psi | 52% | 2349 fps | 98.4% |
| Accurate 2200 | <<locked>> | 84% | 47,253 psi | 79% | 2690 fps | 95.2% |
| Accurate 2230 | <<locked>> | 84% | 47,239 psi | 78% | 2700 fps | 95.7% |
| Accurate 2460 | <<locked>> | 80% | 33,272 psi | 55% | 2415 fps | 96.3% |
| Accurate 2495 | <<locked>> | 80% | 23,380 psi | 39% | 2211 fps | 95.9% |
| Accurate 2520 | <<locked>> | 82% | 31,096 psi | 52% | 2402 fps | 95% |
| Accurate 4064 | <<locked>> | 88% | 29,066 psi | 48% | 2382 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 40,190 psi | 67% | 2454 fps | 99.1% |
| Accurate LT-32 | <<locked>> | 80% | 40,553 psi | 67% | 2464 fps | 97.7% |
| ADI AR 2206H | <<locked>> | 94% | 45,020 psi | 75% | 2674 fps | 95.7% |
| ADI AR 2207 | <<locked>> | 80% | 42,888 psi | 71% | 2543 fps | 100% |
| ADI AR 2219 | <<locked>> | 80% | 37,942 psi | 63% | 2533 fps | 98.7% |
| ADI Benchmark 8208 | <<locked>> | 88% | 39,523 psi | 66% | 2543 fps | 95.7% |
| Alliant AR-Comp | <<locked>> | 80% | 28,660 psi | 48% | 2365 fps | 99.6% |
| Alliant Power Pro 1200-R | 37.6 gr | 84% | 39,450 psi | 66% | 2621 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 38,450 psi | 64% | 2575 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 35,955 psi | 60% | 2464 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 98% | 45,092 psi | 75% | 2694 fps | 95.1% |
| Alliant Reloder-7 | <<locked>> | 80% | 44,106 psi | 73% | 2552 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 38,653 psi | 64% | 2448 fps | 99.1% |
| Bofors RP3 | <<locked>> | 98% | 40,277 psi | 67% | 2625 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 82% | 35,244 psi | 59% | 2405 fps | 95% |
| Hodgdon BL-C2 | <<locked>> | 88% | 36,767 psi | 61% | 2546 fps | 95.6% |
| Hodgdon CFE223 | <<locked>> | 92% | 47,645 psi | 79% | 2792 fps | 95.6% |
| Hodgdon H322 | <<locked>> | 80% | 34,708 psi | 58% | 2464 fps | 97.9% |
| Hodgdon H335 | <<locked>> | 80% | 35,027 psi | 58% | 2474 fps | 97.1% |
| Hodgdon H4198 | <<locked>> | 80% | 44,382 psi | 74% | 2546 fps | 99.3% |
| Hodgdon H4895 | <<locked>> | 90% | 39,784 psi | 66% | 2582 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 40,698 psi | 68% | 2641 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,221 psi | 40% | 1470 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 41,510 psi | 69% | 2592 fps | 95.3% |
| IMR 3031 | <<locked>> | 80% | 27,267 psi | 45% | 2333 fps | 96.2% |
| IMR 4064 | <<locked>> | 98% | 45,455 psi | 76% | 2648 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 37,855 psi | 63% | 2457 fps | 100% |
| IMR 4227 | <<locked>> | 80% | 50,270 psi | 84% | 2592 fps | 100% |
| IMR 4895 | <<locked>> | 96% | 43,178 psi | 72% | 2677 fps | 95.4% |
| IMR 8208 XBR | <<locked>> | 88% | 39,523 psi | 66% | 2543 fps | 95.7% |
| Lovex D073.4 | <<locked>> | 80% | 41,147 psi | 68% | 2582 fps | 97.8% |
| Lovex D073.5 | <<locked>> | 82% | 35,563 psi | 59% | 2467 fps | 95.6% |
| Lovex D073.6 | <<locked>> | 86% | 31,981 psi | 53% | 2438 fps | 95.3% |
| Lovex S053 | <<locked>> | 80% | 49,371 psi | 82% | 2543 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 44,019 psi | 73% | 2575 fps | 95.4% |
| Lovex S062 | <<locked>> | 94% | 38,986 psi | 65% | 2552 fps | 95.7% |
| Norma 200 | <<locked>> | 80% | 40,712 psi | 68% | 2536 fps | 100% |
| Norma 201 | <<locked>> | 90% | 38,711 psi | 64% | 2530 fps | 95.6% |
| Norma 202 | <<locked>> | 82% | 29,791 psi | 49% | 2349 fps | 95.2% |
| Norma 203B | <<locked>> | 98% | 44,135 psi | 73% | 2684 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 98% | 44,860 psi | 75% | 2700 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 92% | 44,092 psi | 73% | 2661 fps | 95.4% |
| Ramshot X-Terminator | <<locked>> | 88% | 43,758 psi | 73% | 2595 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,076 psi | 40% | 1503 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 50,430 psi | 84% | 2628 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 34,664 psi | 58% | 2441 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 98% | 47,514 psi | 79% | 2802 fps | 95.6% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 36,883 psi | 61% | 2592 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 31,183 psi | 52% | 2346 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 92% | 38,986 psi | 65% | 2526 fps | 95.6% |
| Shooters World AR Plus | <<locked>> | 80% | 41,147 psi | 68% | 2582 fps | 97.8% |
| Shooters World Match Rifle | <<locked>> | 86% | 31,981 psi | 53% | 2438 fps | 95.3% |
| Shooters World Precision | <<locked>> | 94% | 38,986 psi | 65% | 2552 fps | 95.7% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 39,189 psi | 65% | 2497 fps | 95.1% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 45,020 psi | 75% | 2333 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 38,464 psi | 64% | 2539 fps | 97.9% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 36,724 psi | 61% | 2474 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 43,627 psi | 72% | 2641 fps | 95.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 30,139 psi | 50% | 2274 fps | 95.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 27,557 psi | 46% | 2231 fps | 95.4% |
| Somchem S321 | 40.5 gr | 84% | 36,956 psi | 61% | 2513 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 29,443 psi | 49% | 2280 fps | 96% |
| Somchem S341 | <<locked>> | 94% | 45,368 psi | 75% | 2657 fps | 95.5% |
| Vihtavuori N120 | <<locked>> | 80% | 42,989 psi | 71% | 2500 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 34,476 psi | 57% | 2379 fps | 99.5% |
| Vihtavuori N133 | <<locked>> | 80% | 29,965 psi | 50% | 2290 fps | 97.9% |
| Vihtavuori N135 | <<locked>> | 80% | 24,918 psi | 41% | 2234 fps | 96.3% |
| Vihtavuori N140 | <<locked>> | 84% | 29,936 psi | 50% | 2336 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 96% | 35,302 psi | 59% | 2470 fps | 95% |
| Vihtavuori N530 | <<locked>> | 86% | 37,130 psi | 62% | 2490 fps | 95% |
| Vihtavuori N540 | <<locked>> | 86% | 30,748 psi | 51% | 2369 fps | 95.4% |
| Winchester 748 | 40.3 gr | 86% | 35,389 psi | 59% | 2513 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 94% | 42,612 psi | 71% | 2644 fps | 95.8% |
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 | Barnes MRX BT. ReloadSwiss RS 52 delivers the highest muzzle velocity at 2,858 fps; across all powders the maximum-charge window runs from 1,644 fps to 2,858 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, Somchem S321, Winchester 748 rank at the top here: for .308 Win. Ackley Improved with the .308 | 150gr | Barnes MRX BT 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.