Load Specifications
Load data in caliber .300 Lapua Mag. with .308 | 240gr | MAKER Rex Expanding Subsonic bullet and 57 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and Vihtavuori N570.
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% | 52,330 psi | 86% | 2526 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 54,578 psi | 90% | 2680 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 86% | 53,722 psi | 88% | 2602 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 51,677 psi | 85% | 2618 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 53,403 psi | 88% | 2648 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 49,530 psi | 81% | 2690 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,634 psi | 85% | 2671 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 53,998 psi | 89% | 2602 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,331 psi | 89% | 2589 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 53,417 psi | 88% | 2595 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 52,141 psi | 86% | 2615 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 53,824 psi | 88% | 2575 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 53,417 psi | 88% | 2644 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 53,998 psi | 89% | 2661 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,085 psi | 89% | 2740 fps | 98.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 45,759 psi | 75% | 2605 fps | 96.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 52,692 psi | 87% | 2589 fps | 98.5% |
| Bofors RP15 | <<locked>> | 92% | 55,114 psi | 90% | 2657 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 53,156 psi | 87% | 2664 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 52,141 psi | 86% | 2615 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 54,926 psi | 90% | 2667 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,940 psi | 90% | 2608 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 88% | 53,809 psi | 88% | 2595 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,476 psi | 89% | 2516 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 52,330 psi | 86% | 2726 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,666 psi | 62% | 1604 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 53,084 psi | 87% | 2530 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 53,388 psi | 88% | 2530 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 52,228 psi | 86% | 2539 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 90% | 53,780 psi | 88% | 2657 fps | 100% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,152 psi | 77% | 2595 fps | 99.7% |
| Lovex S071 | <<locked>> | 94% | 53,853 psi | 88% | 2546 fps | 100% |
| Norma 204 | <<locked>> | 82% | 53,969 psi | 89% | 2585 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 47,993 psi | 79% | 2621 fps | 100% |
| Norma MRP | <<locked>> | 86% | 52,141 psi | 86% | 2631 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,085 psi | 90% | 2569 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 54,462 psi | 89% | 2674 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 53,911 psi | 89% | 2582 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 52,823 psi | 87% | 2612 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,580 psi | 63% | 1640 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 52,620 psi | 86% | 2720 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 51,706 psi | 85% | 2687 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 86% | 54,752 psi | 90% | 2575 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 53,142 psi | 87% | 2589 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 52,750 psi | 87% | 2585 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 52,417 psi | 86% | 2523 fps | 99.6% |
| Somchem S365 | <<locked>> | 82% | 52,504 psi | 86% | 2523 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 53,621 psi | 88% | 2562 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 53,243 psi | 87% | 2549 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 51,677 psi | 85% | 2569 fps | 96.7% |
| Vihtavuori N555 | <<locked>> | 86% | 52,562 psi | 86% | 2556 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 51,822 psi | 85% | 2635 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 92% | 52,083 psi | 86% | 2625 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 96% | 52,750 psi | 87% | 2690 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 98% | 53,592 psi | 88% | 2746 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 90% | 52,634 psi | 86% | 2661 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 53,127 psi | 87% | 2559 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 40,219 psi | 66% | 2339 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,350 psi | 68% | 2457 fps | 97.7% |
| ADI AR 2209 | <<locked>> | 80% | 44,092 psi | 72% | 2451 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 39,552 psi | 65% | 2405 fps | 98.2% |
| ADI AR 2217 | <<locked>> | 82% | 31,560 psi | 52% | 2231 fps | 95.8% |
| ADI AR 2218 | <<locked>> | 96% | 42,960 psi | 71% | 2562 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 26,876 psi | 44% | 2152 fps | 96.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,585 psi | 73% | 2454 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,763 psi | 83% | 2539 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,164 psi | 73% | 2451 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,132 psi | 66% | 2411 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,899 psi | 64% | 2356 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,489 psi | 55% | 2303 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,294 psi | 71% | 2503 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 40,451 psi | 66% | 2500 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 98% | 42,482 psi | 70% | 2546 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 41,292 psi | 68% | 2385 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 37,391 psi | 61% | 2356 fps | 98.6% |
| Bofors RP30 | <<locked>> | 80% | 31,067 psi | 51% | 2247 fps | 96.1% |
| Bofors RP5 | <<locked>> | 80% | 40,132 psi | 66% | 2411 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 80% | 31,966 psi | 52% | 2244 fps | 96.7% |
| Hodgdon H4831 | <<locked>> | 80% | 42,105 psi | 69% | 2402 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,394 psi | 68% | 2388 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,834 psi | 79% | 2428 fps | 100% |
| Hodgdon Retumbo | 63.4 gr | 80% | 32,750 psi | 54% | 2343 fps | 98.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,311 psi | 46% | 1430 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,792 psi | 82% | 2484 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 50,241 psi | 82% | 2487 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,323 psi | 71% | 2392 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 80% | 38,305 psi | 63% | 2392 fps | 98% |
| IMR 8133 Enduron | <<locked>> | 86% | 29,689 psi | 49% | 2234 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 34,809 psi | 57% | 2234 fps | 99.6% |
| Norma 204 | <<locked>> | 80% | 50,343 psi | 83% | 2533 fps | 100% |
| Norma 217 | <<locked>> | 82% | 26,165 psi | 43% | 2156 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 42,250 psi | 69% | 2474 fps | 100% |
| Norma URP | <<locked>> | 80% | 51,619 psi | 85% | 2523 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,029 psi | 62% | 2398 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 80% | 50,357 psi | 83% | 2533 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,968 psi | 56% | 2290 fps | 98.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,022 psi | 48% | 1467 fps | 100% |
| ReloadSwiss RS 76 | 67.9 gr | 80% | 31,778 psi | 52% | 2320 fps | 98.9% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 33,257 psi | 55% | 2339 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 45,237 psi | 74% | 2428 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 80% | 43,656 psi | 72% | 2438 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,323 psi | 71% | 2434 fps | 99.6% |
| Somchem S361 | <<locked>> | 80% | 45,905 psi | 75% | 2421 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 49,095 psi | 81% | 2480 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,179 psi | 73% | 2418 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 38,479 psi | 63% | 2310 fps | 99.2% |
| Vihtavuori N170 | <<locked>> | 90% | 45,426 psi | 75% | 2464 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 80% | 43,265 psi | 71% | 2418 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,134 psi | 69% | 2467 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 80% | 34,896 psi | 57% | 2313 fps | 96.7% |
| Vihtavuori N568 | <<locked>> | 84% | 34,708 psi | 57% | 2352 fps | 95.2% |
| Vihtavuori N570 | 74.1 gr | 90% | 40,611 psi | 67% | 2513 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,056 psi | 59% | 2408 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,437 psi | 66% | 2356 fps | 99.2% |
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 57 powders for .300 Lapua Mag. loaded with the .308 | 240gr | MAKER Rex Expanding Subsonic. Vihtavuori N570 delivers the highest muzzle velocity at 2,746 fps; across all powders the maximum-charge window runs from 1,604 fps to 2,746 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 240.0 gr projectile in 0.308" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-33 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. Hodgdon Retumbo, ReloadSwiss RS 76, Vihtavuori N570 rank at the top here: for .300 Lapua Mag. with the .308 | 240gr | MAKER Rex Expanding Subsonic 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.