Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 307gr | Hornady Sub-X bullet and 51 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 54,128 psi | 89% | 2402 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 52,866 psi | 87% | 2500 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 84% | 52,069 psi | 85% | 2431 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 53,708 psi | 88% | 2493 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 96% | 51,909 psi | 85% | 2474 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,605 psi | 85% | 2572 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,838 psi | 88% | 2543 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 51,750 psi | 85% | 2421 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 54,157 psi | 89% | 2490 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 52,504 psi | 86% | 2408 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 52,199 psi | 86% | 2474 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 52,301 psi | 86% | 2480 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 52,707 psi | 87% | 2559 fps | 98.6% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 48,124 psi | 79% | 2490 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 54,375 psi | 89% | 2464 fps | 98.8% |
| Bofors RP15 | <<locked>> | 90% | 53,592 psi | 88% | 2480 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 51,924 psi | 85% | 2490 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 54,157 psi | 89% | 2490 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 53,359 psi | 88% | 2490 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 53,243 psi | 87% | 2438 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 86% | 52,112 psi | 86% | 2421 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 52,678 psi | 86% | 2349 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 54,607 psi | 90% | 2595 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,710 psi | 62% | 1519 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 54,665 psi | 90% | 2405 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 53,780 psi | 88% | 2415 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 88% | 52,170 psi | 86% | 2480 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,414 psi | 81% | 2477 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 52,417 psi | 86% | 2382 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 50,256 psi | 83% | 2497 fps | 100% |
| Norma MRP | <<locked>> | 86% | 54,056 psi | 89% | 2503 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 52,837 psi | 87% | 2497 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,998 psi | 90% | 2487 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,682 psi | 64% | 1555 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 55,100 psi | 90% | 2589 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 54,215 psi | 89% | 2562 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 84% | 52,823 psi | 87% | 2402 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 55,013 psi | 90% | 2461 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 54,621 psi | 90% | 2457 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 53,969 psi | 89% | 2402 fps | 99.7% |
| Somchem S365 | <<locked>> | 82% | 54,418 psi | 89% | 2398 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 51,866 psi | 85% | 2392 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,056 psi | 90% | 2425 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 53,621 psi | 88% | 2448 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 86% | 54,389 psi | 89% | 2428 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 53,650 psi | 88% | 2507 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 92% | 54,143 psi | 89% | 2500 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 96% | 55,042 psi | 90% | 2562 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 96% | 52,431 psi | 86% | 2566 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 88% | 51,430 psi | 84% | 2487 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,955 psi | 90% | 2434 fps | 100% |
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 3100 | <<locked>> | 80% | 41,597 psi | 68% | 2224 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 42,902 psi | 70% | 2339 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 80% | 45,600 psi | 75% | 2333 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 40,857 psi | 67% | 2290 fps | 98.5% |
| ADI AR 2217 | <<locked>> | 80% | 30,516 psi | 50% | 2073 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 94% | 41,713 psi | 68% | 2392 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 27,891 psi | 46% | 2051 fps | 97.4% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,527 psi | 75% | 2326 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,524 psi | 68% | 2293 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,364 psi | 66% | 2238 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,824 psi | 57% | 2195 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,281 psi | 74% | 2382 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 39,363 psi | 65% | 2333 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 96% | 41,524 psi | 68% | 2375 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 39,929 psi | 66% | 2221 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 38,725 psi | 64% | 2241 fps | 98.9% |
| Bofors RP30 | <<locked>> | 80% | 32,358 psi | 53% | 2139 fps | 96.6% |
| Bofors RP5 | <<locked>> | 80% | 41,524 psi | 68% | 2293 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 80% | 33,185 psi | 54% | 2139 fps | 97.2% |
| Hodgdon H4831 | <<locked>> | 80% | 43,468 psi | 71% | 2287 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,685 psi | 70% | 2274 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,385 psi | 81% | 2306 fps | 100% |
| Hodgdon Retumbo | 74.2 gr | 80% | 34,026 psi | 56% | 2231 fps | 98.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,355 psi | 47% | 1355 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,256 psi | 84% | 2359 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,628 psi | 73% | 2277 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 80% | 39,726 psi | 65% | 2277 fps | 98.4% |
| IMR 8133 Enduron | <<locked>> | 86% | 30,995 psi | 51% | 2133 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 35,984 psi | 59% | 2123 fps | 99.7% |
| Norma 217 | <<locked>> | 80% | 25,541 psi | 42% | 2005 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 43,888 psi | 72% | 2352 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,552 psi | 65% | 2287 fps | 98.7% |
| Ramshot Magnum | <<locked>> | 80% | 35,360 psi | 58% | 2182 fps | 99% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,138 psi | 48% | 1388 fps | 100% |
| ReloadSwiss RS 76 | 79.5 gr | 80% | 33,112 psi | 54% | 2215 fps | 99.3% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 34,737 psi | 57% | 2228 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 46,615 psi | 77% | 2310 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 80% | 45,223 psi | 74% | 2320 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,904 psi | 74% | 2316 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 47,398 psi | 78% | 2306 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 50,836 psi | 83% | 2356 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,527 psi | 75% | 2297 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,755 psi | 65% | 2198 fps | 99.4% |
| Vihtavuori N170 | <<locked>> | 90% | 47,050 psi | 77% | 2349 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 80% | 44,962 psi | 74% | 2300 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,685 psi | 72% | 2349 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 80% | 36,274 psi | 60% | 2201 fps | 97.1% |
| Vihtavuori N568 | <<locked>> | 84% | 36,172 psi | 59% | 2244 fps | 95.8% |
| Vihtavuori N570 | 86.7 gr | 90% | 42,395 psi | 70% | 2398 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,971 psi | 62% | 2290 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,858 psi | 69% | 2241 fps | 99.4% |
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 58 powders for .338 Lapua Mag. loaded with the .338 | 307gr | Hornady Sub-X. Hodgdon Retumbo delivers the highest muzzle velocity at 2,595 fps; across all powders the maximum-charge window runs from 1,519 fps to 2,595 fps. Accurate 8700 gives the best case fill at 100 %, and 58 of the 58 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 307.0 gr projectile in 0.338" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, ADI AR 2225 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .338 Lapua Mag. with the .338 | 307gr | Hornady Sub-X they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, Lovex D100, Ramshot LRT burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.