Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 300gr | Woodleigh RN SN 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% | 54,259 psi | 89% | 2431 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 53,679 psi | 88% | 2536 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 84% | 52,141 psi | 86% | 2457 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 53,795 psi | 88% | 2520 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 96% | 51,967 psi | 85% | 2500 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,721 psi | 85% | 2598 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,969 psi | 89% | 2569 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 51,793 psi | 85% | 2448 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 54,259 psi | 89% | 2516 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 52,504 psi | 86% | 2438 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 52,228 psi | 86% | 2500 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 52,344 psi | 86% | 2510 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 52,852 psi | 87% | 2582 fps | 98.4% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 48,167 psi | 79% | 2513 fps | 97% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 54,462 psi | 89% | 2490 fps | 98.6% |
| Bofors RP15 | <<locked>> | 90% | 53,490 psi | 88% | 2507 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 51,866 psi | 85% | 2513 fps | 99.9% |
| Bofors RP5 | <<locked>> | 88% | 54,259 psi | 89% | 2516 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 53,461 psi | 88% | 2520 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 53,156 psi | 87% | 2464 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 52,214 psi | 86% | 2448 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 52,663 psi | 86% | 2375 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 54,708 psi | 90% | 2625 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,710 psi | 62% | 1539 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 54,607 psi | 90% | 2431 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 53,940 psi | 89% | 2444 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 88% | 52,098 psi | 86% | 2503 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,443 psi | 81% | 2500 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 52,402 psi | 86% | 2408 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 50,256 psi | 83% | 2520 fps | 100% |
| Norma MRP | <<locked>> | 86% | 54,128 psi | 89% | 2530 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 53,055 psi | 87% | 2526 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,998 psi | 90% | 2513 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,653 psi | 63% | 1575 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 51,068 psi | 84% | 2562 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 54,418 psi | 89% | 2592 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 84% | 52,895 psi | 87% | 2431 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 86% | 54,998 psi | 90% | 2490 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 54,607 psi | 90% | 2487 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 54,041 psi | 89% | 2428 fps | 99.7% |
| Somchem S365 | <<locked>> | 82% | 54,360 psi | 89% | 2428 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 51,924 psi | 85% | 2418 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,100 psi | 90% | 2451 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 53,766 psi | 88% | 2477 fps | 97% |
| Vihtavuori N555 | <<locked>> | 86% | 54,433 psi | 89% | 2457 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 53,708 psi | 88% | 2533 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 92% | 54,259 psi | 89% | 2526 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 94% | 51,561 psi | 85% | 2536 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 96% | 52,315 psi | 86% | 2589 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 88% | 51,401 psi | 84% | 2513 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,013 psi | 90% | 2461 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% | 41,713 psi | 68% | 2251 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 40,654 psi | 67% | 2316 fps | 96.7% |
| ADI AR 2209 | <<locked>> | 80% | 45,585 psi | 75% | 2359 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 40,959 psi | 67% | 2313 fps | 98.4% |
| ADI AR 2217 | <<locked>> | 80% | 30,545 psi | 50% | 2093 fps | 95% |
| ADI AR 2218 | <<locked>> | 94% | 41,785 psi | 69% | 2415 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 27,963 psi | 46% | 2073 fps | 97.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,658 psi | 75% | 2352 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,626 psi | 68% | 2320 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,408 psi | 66% | 2260 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,824 psi | 57% | 2215 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,295 psi | 74% | 2408 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 42,438 psi | 70% | 2411 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 96% | 41,684 psi | 68% | 2398 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 39,827 psi | 65% | 2241 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 38,725 psi | 64% | 2264 fps | 98.7% |
| Bofors RP30 | <<locked>> | 80% | 32,474 psi | 53% | 2162 fps | 96.3% |
| Bofors RP5 | <<locked>> | 80% | 41,626 psi | 68% | 2320 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 80% | 33,156 psi | 54% | 2159 fps | 97% |
| Hodgdon H4831 | <<locked>> | 80% | 43,555 psi | 72% | 2310 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,801 psi | 70% | 2300 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,472 psi | 81% | 2333 fps | 100% |
| Hodgdon Retumbo | 75.7 gr | 80% | 34,127 psi | 56% | 2254 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,384 psi | 47% | 1375 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,242 psi | 84% | 2385 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,628 psi | 73% | 2300 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 80% | 39,697 psi | 65% | 2300 fps | 98.2% |
| IMR 8133 Enduron | <<locked>> | 86% | 31,009 psi | 51% | 2149 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 36,056 psi | 59% | 2149 fps | 99.7% |
| Norma 217 | <<locked>> | 82% | 27,354 psi | 45% | 2073 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 43,961 psi | 72% | 2379 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,595 psi | 65% | 2310 fps | 98.5% |
| Ramshot Magnum | <<locked>> | 80% | 35,389 psi | 58% | 2205 fps | 98.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,993 psi | 48% | 1404 fps | 100% |
| ReloadSwiss RS 76 | 81 gr | 80% | 33,112 psi | 54% | 2234 fps | 99.1% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 34,766 psi | 57% | 2251 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 46,615 psi | 77% | 2336 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 80% | 45,223 psi | 74% | 2346 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,889 psi | 74% | 2343 fps | 99.7% |
| Somchem S361 | <<locked>> | 80% | 47,398 psi | 78% | 2329 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 50,865 psi | 84% | 2382 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,629 psi | 75% | 2323 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 39,885 psi | 65% | 2221 fps | 99.3% |
| Vihtavuori N170 | <<locked>> | 90% | 47,007 psi | 77% | 2372 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 44,991 psi | 74% | 2326 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,758 psi | 72% | 2375 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 80% | 36,318 psi | 60% | 2224 fps | 96.9% |
| Vihtavuori N568 | <<locked>> | 84% | 36,230 psi | 59% | 2267 fps | 95.5% |
| Vihtavuori N570 | 88.3 gr | 90% | 42,322 psi | 69% | 2418 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,043 psi | 62% | 2316 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,930 psi | 69% | 2267 fps | 99.3% |
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 51 powders for .338 Lapua Mag. loaded with the .338 | 300gr | Woodleigh RN SN. Hodgdon Retumbo delivers the highest muzzle velocity at 2,625 fps; across all powders the maximum-charge window runs from 1,539 fps to 2,625 fps. ADI AR 2218 gives the best case fill at 100 %, and 51 of the 51 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 300.0 gr projectile in 0.338" calls for a 1:15.5 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .338 Lapua Mag. with the .338 | 300gr | Woodleigh RN SN 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.