Load Specifications
Load data in caliber .300 Lapua Mag. with .308 | 240gr | Sierra HPBT LR MatchKing bullet and 53 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% | 53,998 psi | 89% | 2559 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 51,909 psi | 85% | 2654 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 86% | 52,678 psi | 86% | 2661 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 84% | 51,953 psi | 85% | 2585 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 53,548 psi | 88% | 2654 fps | 100% |
| ADI AR 2217 | <<locked>> | 96% | 51,692 psi | 85% | 2631 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,314 psi | 84% | 2736 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,664 psi | 88% | 2707 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,071 psi | 90% | 2628 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 54,012 psi | 89% | 2648 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 52,185 psi | 86% | 2562 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 51,808 psi | 85% | 2628 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 52,257 psi | 86% | 2644 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 52,605 psi | 86% | 2726 fps | 98.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 47,993 psi | 79% | 2651 fps | 97.4% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 54,186 psi | 89% | 2621 fps | 98.8% |
| Bofors RP15 | <<locked>> | 90% | 53,301 psi | 88% | 2638 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 51,706 psi | 85% | 2648 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 54,012 psi | 89% | 2648 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 53,185 psi | 87% | 2651 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 52,982 psi | 87% | 2592 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 86% | 51,938 psi | 85% | 2579 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 52,417 psi | 86% | 2497 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 54,491 psi | 89% | 2762 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,739 psi | 62% | 1617 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 54,549 psi | 90% | 2562 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 55,013 psi | 90% | 2559 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 53,737 psi | 88% | 2572 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 88% | 51,924 psi | 85% | 2638 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,240 psi | 81% | 2638 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 52,286 psi | 86% | 2536 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 49,980 psi | 82% | 2654 fps | 100% |
| Norma MRP | <<locked>> | 86% | 53,867 psi | 88% | 2664 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 52,721 psi | 87% | 2657 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,853 psi | 90% | 2644 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,653 psi | 63% | 1654 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 54,810 psi | 90% | 2756 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 53,983 psi | 89% | 2726 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 84% | 52,765 psi | 87% | 2559 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 54,650 psi | 90% | 2618 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 54,259 psi | 89% | 2615 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 53,780 psi | 88% | 2552 fps | 99.7% |
| Somchem S365 | <<locked>> | 82% | 54,273 psi | 89% | 2556 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,027 psi | 90% | 2589 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 54,737 psi | 90% | 2579 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 53,505 psi | 88% | 2608 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 86% | 54,244 psi | 89% | 2585 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 53,447 psi | 88% | 2667 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 92% | 54,041 psi | 89% | 2664 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 96% | 54,853 psi | 90% | 2726 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 96% | 52,141 psi | 86% | 2730 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 90% | 54,955 psi | 90% | 2694 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,650 psi | 90% | 2589 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 41,495 psi | 68% | 2369 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 45,223 psi | 74% | 2543 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 80% | 42,728 psi | 70% | 2493 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 80% | 45,411 psi | 75% | 2484 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 40,770 psi | 67% | 2438 fps | 98.6% |
| ADI AR 2217 | <<locked>> | 80% | 30,472 psi | 50% | 2208 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 94% | 41,495 psi | 68% | 2546 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 27,746 psi | 46% | 2185 fps | 97.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,426 psi | 75% | 2480 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,423 psi | 68% | 2444 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,306 psi | 66% | 2385 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,664 psi | 57% | 2336 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,107 psi | 74% | 2536 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 39,218 psi | 64% | 2484 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 96% | 41,466 psi | 68% | 2533 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 39,711 psi | 65% | 2362 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 38,609 psi | 63% | 2388 fps | 99% |
| Bofors RP30 | <<locked>> | 80% | 32,242 psi | 53% | 2280 fps | 96.7% |
| Bofors RP5 | <<locked>> | 80% | 41,423 psi | 68% | 2444 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 80% | 32,953 psi | 54% | 2277 fps | 97.3% |
| Hodgdon H4831 | <<locked>> | 80% | 43,294 psi | 71% | 2434 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,569 psi | 70% | 2421 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,327 psi | 81% | 2454 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 33,881 psi | 56% | 2379 fps | 98.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,311 psi | 46% | 1440 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,068 psi | 84% | 2510 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 51,663 psi | 85% | 2513 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,469 psi | 73% | 2421 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 80% | 39,552 psi | 65% | 2425 fps | 98.4% |
| IMR 8133 Enduron | <<locked>> | 84% | 28,993 psi | 48% | 2221 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 35,940 psi | 59% | 2264 fps | 99.8% |
| Norma 217 | <<locked>> | 80% | 25,425 psi | 42% | 2136 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 43,772 psi | 72% | 2507 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,450 psi | 65% | 2434 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 80% | 35,259 psi | 58% | 2326 fps | 99% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,022 psi | 48% | 1476 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 32,880 psi | 54% | 2356 fps | 99.3% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 34,534 psi | 57% | 2372 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 46,499 psi | 76% | 2461 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 80% | 45,005 psi | 74% | 2470 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,672 psi | 73% | 2464 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 47,123 psi | 77% | 2451 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 50,662 psi | 83% | 2507 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,411 psi | 75% | 2448 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,682 psi | 65% | 2339 fps | 99.5% |
| Vihtavuori N170 | <<locked>> | 90% | 46,862 psi | 77% | 2500 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 44,715 psi | 73% | 2448 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,526 psi | 71% | 2503 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 80% | 36,216 psi | 59% | 2346 fps | 97.3% |
| Vihtavuori N568 | <<locked>> | 84% | 36,056 psi | 59% | 2388 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 90% | 42,148 psi | 69% | 2552 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,782 psi | 62% | 2441 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,756 psi | 69% | 2388 fps | 99.4% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 53 powders for .300 Lapua Mag. loaded with the .308 | 240gr | Sierra HPBT LR MatchKing. Hodgdon Retumbo delivers the highest muzzle velocity at 2,762 fps; across all powders the maximum-charge window runs from 1,617 fps to 2,762 fps. ADI AR 2218 gives the best case fill at 100 %, and 53 of the 53 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 240.0 gr projectile in 0.308" calls for a 1:11.0 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.