Load Specifications
Load data in caliber .300 Lapua Mag. with .308 | 220gr | Sierra Pro-Hunter bullet and 57 powders. The key underlying parameters are shown in the table above.
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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 53,011 psi | 87% | 2664 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 54,375 psi | 89% | 2812 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 86% | 51,590 psi | 85% | 2762 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 86% | 54,520 psi | 90% | 2746 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 52,518 psi | 86% | 2759 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 98% | 54,317 psi | 89% | 2789 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 50,473 psi | 83% | 2831 fps | 97.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,562 psi | 86% | 2812 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 54,520 psi | 90% | 2740 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,752 psi | 90% | 2730 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 53,925 psi | 89% | 2736 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 52,997 psi | 87% | 2756 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 54,578 psi | 90% | 2717 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 54,157 psi | 89% | 2785 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 54,926 psi | 90% | 2805 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 51,343 psi | 84% | 2822 fps | 97.9% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 46,833 psi | 77% | 2740 fps | 96.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 53,272 psi | 87% | 2723 fps | 98.2% |
| Bofors RP15 | <<locked>> | 90% | 52,243 psi | 86% | 2743 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 54,012 psi | 89% | 2802 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 52,997 psi | 87% | 2756 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 52,170 psi | 86% | 2756 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 51,924 psi | 85% | 2694 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 88% | 54,578 psi | 90% | 2736 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,926 psi | 90% | 2654 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 53,156 psi | 87% | 2871 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,652 psi | 62% | 1703 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 53,635 psi | 88% | 2671 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 54,041 psi | 89% | 2671 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 52,924 psi | 87% | 2680 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 90% | 54,418 psi | 89% | 2799 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,979 psi | 79% | 2733 fps | 99.6% |
| Lovex S071 | <<locked>> | 94% | 54,476 psi | 89% | 2684 fps | 100% |
| Norma 204 | <<locked>> | 82% | 54,418 psi | 89% | 2723 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 48,762 psi | 80% | 2756 fps | 100% |
| Norma MRP | <<locked>> | 86% | 52,678 psi | 86% | 2769 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 51,532 psi | 85% | 2762 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 54,346 psi | 89% | 2720 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 53,563 psi | 88% | 2749 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,508 psi | 63% | 1742 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 53,548 psi | 88% | 2861 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 52,678 psi | 86% | 2825 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 84% | 51,750 psi | 85% | 2661 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 86% | 53,737 psi | 88% | 2726 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 53,345 psi | 88% | 2723 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 52,852 psi | 87% | 2657 fps | 99.4% |
| Somchem S365 | <<locked>> | 82% | 53,185 psi | 87% | 2664 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 53,983 psi | 89% | 2697 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 53,882 psi | 88% | 2687 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 52,562 psi | 86% | 2707 fps | 96.4% |
| Vihtavuori N555 | <<locked>> | 86% | 53,142 psi | 87% | 2694 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 52,315 psi | 86% | 2772 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 92% | 52,866 psi | 87% | 2766 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 96% | 53,693 psi | 88% | 2828 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 98% | 54,592 psi | 90% | 2884 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 90% | 53,635 psi | 88% | 2805 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 53,766 psi | 88% | 2697 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 40,553 psi | 67% | 2464 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 44,295 psi | 73% | 2638 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 80% | 41,756 psi | 69% | 2582 fps | 97.3% |
| ADI AR 2209 | <<locked>> | 80% | 44,686 psi | 73% | 2585 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 39,972 psi | 66% | 2530 fps | 97.8% |
| ADI AR 2217 | <<locked>> | 82% | 31,879 psi | 52% | 2343 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 96% | 43,671 psi | 72% | 2694 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 27,195 psi | 45% | 2260 fps | 96.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,947 psi | 74% | 2585 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,227 psi | 84% | 2677 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,527 psi | 73% | 2579 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,582 psi | 67% | 2539 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,262 psi | 64% | 2477 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,011 psi | 56% | 2428 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,845 psi | 72% | 2635 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 41,133 psi | 68% | 2628 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 98% | 43,395 psi | 71% | 2674 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 41,597 psi | 68% | 2503 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 37,782 psi | 62% | 2477 fps | 98.2% |
| Bofors RP30 | <<locked>> | 80% | 31,401 psi | 52% | 2359 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 40,582 psi | 67% | 2539 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 80% | 32,329 psi | 53% | 2356 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 80% | 42,496 psi | 70% | 2530 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,829 psi | 69% | 2516 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,312 psi | 79% | 2562 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 33,156 psi | 54% | 2461 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,210 psi | 46% | 1519 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,372 psi | 83% | 2621 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 50,691 psi | 83% | 2621 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,859 psi | 72% | 2523 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 80% | 38,624 psi | 63% | 2513 fps | 97.5% |
| IMR 8133 Enduron | <<locked>> | 88% | 32,169 psi | 53% | 2402 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 35,070 psi | 58% | 2349 fps | 99.4% |
| Norma 204 | <<locked>> | 80% | 51,024 psi | 84% | 2671 fps | 99.9% |
| Norma 217 | <<locked>> | 82% | 26,513 psi | 44% | 2260 fps | 95% |
| Norma MRP | <<locked>> | 80% | 42,815 psi | 70% | 2602 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 38,435 psi | 63% | 2523 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 80% | 50,995 psi | 84% | 2671 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,403 psi | 56% | 2408 fps | 98.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,022 psi | 48% | 1558 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 32,126 psi | 53% | 2434 fps | 98.4% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 36,347 psi | 60% | 2516 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 45,672 psi | 75% | 2559 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 80% | 44,092 psi | 72% | 2569 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,758 psi | 72% | 2562 fps | 99.4% |
| Somchem S361 | <<locked>> | 80% | 46,398 psi | 76% | 2552 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 49,763 psi | 82% | 2618 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,614 psi | 73% | 2546 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 38,812 psi | 64% | 2431 fps | 98.9% |
| Vihtavuori N170 | <<locked>> | 92% | 49,153 psi | 81% | 2648 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 43,830 psi | 72% | 2552 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,670 psi | 70% | 2598 fps | 98% |
| Vihtavuori N565 | <<locked>> | 80% | 35,360 psi | 58% | 2431 fps | 96.1% |
| Vihtavuori N568 | <<locked>> | 86% | 37,666 psi | 62% | 2530 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 92% | 44,164 psi | 73% | 2700 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,753 psi | 60% | 2536 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,915 psi | 67% | 2480 fps | 98.9% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 57 powders for .300 Lapua Mag. loaded with the .308 | 220gr | Sierra Pro-Hunter. Vihtavuori N570 delivers the highest muzzle velocity at 2,884 fps; across all powders the maximum-charge window runs from 1,703 fps to 2,884 fps. ADI AR 2218 gives the best case fill at 100 %, and 57 of the 57 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 62–90 %, leaving at least 10 % headroom. The 220.0 gr projectile in 0.308" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-50 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.