Load Specifications
Load data in caliber .300 Lapua Mag. with .308 | 220gr | Hornady InterLock RN bullet and 55 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% | 53,461 psi | 88% | 2674 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 55,056 psi | 90% | 2825 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 86% | 52,040 psi | 85% | 2769 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 86% | 54,766 psi | 90% | 2753 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 52,953 psi | 87% | 2769 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 54,911 psi | 90% | 2799 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 50,952 psi | 84% | 2844 fps | 97.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,127 psi | 87% | 2822 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 54,375 psi | 89% | 2743 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 53,432 psi | 88% | 2762 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,056 psi | 90% | 2723 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 54,839 psi | 90% | 2795 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 51,416 psi | 84% | 2756 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 51,895 psi | 85% | 2831 fps | 98% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 47,398 psi | 78% | 2749 fps | 96.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 53,722 psi | 88% | 2733 fps | 98.3% |
| Bofors RP15 | <<locked>> | 90% | 52,678 psi | 86% | 2753 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 54,433 psi | 89% | 2808 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 53,432 psi | 88% | 2762 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 52,591 psi | 86% | 2762 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 52,344 psi | 86% | 2703 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,027 psi | 90% | 2743 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 51,967 psi | 85% | 2615 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 53,809 psi | 88% | 2881 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,623 psi | 62% | 1706 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 53,911 psi | 89% | 2674 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 54,331 psi | 89% | 2677 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 53,127 psi | 87% | 2684 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 90% | 54,911 psi | 90% | 2805 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,573 psi | 80% | 2743 fps | 99.6% |
| Lovex S071 | <<locked>> | 94% | 54,926 psi | 90% | 2694 fps | 100% |
| Norma 204 | <<locked>> | 82% | 54,839 psi | 90% | 2733 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 49,385 psi | 81% | 2766 fps | 100% |
| Norma MRP | <<locked>> | 86% | 53,359 psi | 88% | 2779 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 51,982 psi | 85% | 2769 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 54,810 psi | 90% | 2730 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,215 psi | 89% | 2759 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,638 psi | 63% | 1749 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 54,157 psi | 89% | 2871 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 53,490 psi | 88% | 2838 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 84% | 52,199 psi | 86% | 2671 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 86% | 54,215 psi | 89% | 2736 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 53,824 psi | 88% | 2733 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 53,214 psi | 87% | 2664 fps | 99.4% |
| Somchem S365 | <<locked>> | 82% | 53,505 psi | 88% | 2671 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 54,418 psi | 89% | 2703 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 54,302 psi | 89% | 2694 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 52,895 psi | 87% | 2713 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 86% | 53,621 psi | 88% | 2703 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 52,968 psi | 87% | 2782 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 92% | 53,519 psi | 88% | 2776 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 96% | 54,302 psi | 89% | 2838 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 96% | 51,430 psi | 84% | 2835 fps | 97.6% |
| Winchester StaBALL HD | <<locked>> | 90% | 54,201 psi | 89% | 2812 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,186 psi | 89% | 2707 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 40,988 psi | 67% | 2470 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 44,744 psi | 73% | 2648 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 80% | 42,177 psi | 69% | 2592 fps | 97.4% |
| ADI AR 2209 | <<locked>> | 80% | 44,976 psi | 74% | 2592 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 40,219 psi | 66% | 2539 fps | 97.9% |
| ADI AR 2217 | <<locked>> | 82% | 32,082 psi | 53% | 2349 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 96% | 44,106 psi | 72% | 2707 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 27,398 psi | 45% | 2267 fps | 96.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,962 psi | 74% | 2585 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,872 psi | 67% | 2546 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,726 psi | 65% | 2487 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,272 psi | 56% | 2434 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,353 psi | 73% | 2644 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 41,640 psi | 68% | 2641 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 98% | 43,932 psi | 72% | 2687 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 41,901 psi | 69% | 2513 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 38,058 psi | 62% | 2487 fps | 98.3% |
| Bofors RP30 | <<locked>> | 80% | 31,792 psi | 52% | 2369 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 40,872 psi | 67% | 2546 fps | 99% |
| Hodgdon H1000 | <<locked>> | 80% | 32,547 psi | 53% | 2365 fps | 96.3% |
| Hodgdon H4831 | <<locked>> | 80% | 42,902 psi | 70% | 2539 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,076 psi | 69% | 2523 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,646 psi | 80% | 2569 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 33,417 psi | 55% | 2467 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,253 psi | 46% | 1522 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,647 psi | 83% | 2628 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 50,995 psi | 84% | 2628 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,077 psi | 72% | 2530 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 80% | 39,044 psi | 64% | 2523 fps | 97.7% |
| IMR 8133 Enduron | <<locked>> | 88% | 32,532 psi | 53% | 2411 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 35,331 psi | 58% | 2359 fps | 99.4% |
| Norma 204 | <<locked>> | 80% | 51,256 psi | 84% | 2677 fps | 99.9% |
| Norma 217 | <<locked>> | 82% | 26,731 psi | 44% | 2267 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 43,279 psi | 71% | 2612 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 38,856 psi | 64% | 2533 fps | 98% |
| Ramshot Hunter | <<locked>> | 80% | 51,285 psi | 84% | 2677 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,795 psi | 57% | 2418 fps | 98.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,066 psi | 48% | 1562 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 32,474 psi | 53% | 2444 fps | 98.6% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 36,680 psi | 60% | 2523 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 45,948 psi | 75% | 2566 fps | 99% |
| Rottweil R 905 | <<locked>> | 80% | 44,382 psi | 73% | 2572 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,063 psi | 72% | 2569 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 46,760 psi | 77% | 2559 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 50,096 psi | 82% | 2625 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,889 psi | 74% | 2552 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 39,218 psi | 64% | 2441 fps | 99% |
| Vihtavuori N170 | <<locked>> | 92% | 49,487 psi | 81% | 2657 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 80% | 44,179 psi | 73% | 2559 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,105 psi | 71% | 2608 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 80% | 35,621 psi | 58% | 2438 fps | 96.3% |
| Vihtavuori N568 | <<locked>> | 86% | 38,218 psi | 63% | 2543 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 92% | 44,570 psi | 73% | 2710 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,130 psi | 61% | 2543 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,162 psi | 68% | 2487 fps | 99% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 55 powders for .300 Lapua Mag. loaded with the .308 | 220gr | Hornady InterLock RN. Hodgdon Retumbo delivers the highest muzzle velocity at 2,881 fps; across all powders the maximum-charge window runs from 1,706 fps to 2,881 fps. ADI AR 2218 gives the best case fill at 100 %, and 55 of the 55 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 1:14.5 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.