Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 300gr | Hornady HPBT bullet and 62 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 ReloadSwiss RS 80.
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% | 51,677 psi | 85% | 2388 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 53,156 psi | 87% | 2526 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 53,809 psi | 88% | 2533 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 86% | 53,243 psi | 87% | 2464 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 54,781 psi | 90% | 2526 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 98% | 52,765 psi | 87% | 2500 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 48,791 psi | 80% | 2536 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,894 psi | 84% | 2523 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 53,461 psi | 88% | 2461 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 53,693 psi | 88% | 2448 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 52,881 psi | 87% | 2454 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 51,488 psi | 85% | 2470 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 53,127 psi | 87% | 2438 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 52,649 psi | 86% | 2500 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 53,229 psi | 87% | 2516 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,272 psi | 87% | 2585 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 52,286 psi | 86% | 2444 fps | 98% |
| Bofors RP15 | <<locked>> | 92% | 54,375 psi | 89% | 2510 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 52,417 psi | 86% | 2513 fps | 99.9% |
| Bofors RP5 | <<locked>> | 88% | 51,488 psi | 85% | 2470 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 54,259 psi | 89% | 2520 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,375 psi | 89% | 2467 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 53,200 psi | 87% | 2451 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 53,737 psi | 88% | 2382 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 55,085 psi | 90% | 2621 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,608 psi | 62% | 1522 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 52,547 psi | 86% | 2395 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 52,881 psi | 87% | 2395 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 51,822 psi | 85% | 2402 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 90% | 52,924 psi | 87% | 2507 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,441 psi | 76% | 2451 fps | 99.5% |
| Lovex S070 | <<locked>> | 82% | 54,679 psi | 90% | 2418 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 53,185 psi | 87% | 2408 fps | 100% |
| Norma 204 | <<locked>> | 82% | 53,287 psi | 87% | 2444 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 47,021 psi | 77% | 2470 fps | 100% |
| Norma MRP | <<locked>> | 88% | 54,969 psi | 90% | 2533 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,389 psi | 89% | 2431 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 53,722 psi | 88% | 2526 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 53,214 psi | 87% | 2441 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 52,011 psi | 85% | 2467 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,566 psi | 63% | 1558 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,462 psi | 89% | 2493 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 51,663 psi | 85% | 2566 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 54,723 psi | 90% | 2589 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 86% | 54,099 psi | 89% | 2434 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 86% | 52,489 psi | 86% | 2444 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 54,679 psi | 90% | 2418 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 52,112 psi | 86% | 2444 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 51,764 psi | 85% | 2385 fps | 99.3% |
| Somchem S365 | <<locked>> | 82% | 51,895 psi | 85% | 2388 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 52,837 psi | 87% | 2421 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 52,576 psi | 86% | 2408 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 54,592 psi | 90% | 2477 fps | 96.9% |
| Vihtavuori N550 | <<locked>> | 82% | 55,100 psi | 90% | 2428 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 51,938 psi | 85% | 2418 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 54,607 psi | 90% | 2536 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 94% | 54,984 psi | 90% | 2530 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 96% | 51,967 psi | 85% | 2536 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 98% | 52,779 psi | 87% | 2589 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,100 psi | 90% | 2382 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 51,634 psi | 85% | 2516 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 52,460 psi | 86% | 2418 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% | 39,653 psi | 65% | 2208 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 43,120 psi | 71% | 2365 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 80% | 40,669 psi | 67% | 2316 fps | 97.1% |
| ADI AR 2209 | <<locked>> | 80% | 43,642 psi | 72% | 2316 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 39,030 psi | 64% | 2267 fps | 97.7% |
| ADI AR 2217 | <<locked>> | 82% | 31,125 psi | 51% | 2100 fps | 95% |
| ADI AR 2218 | <<locked>> | 96% | 42,438 psi | 70% | 2411 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 26,571 psi | 44% | 2024 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,019 psi | 72% | 2316 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,227 psi | 82% | 2402 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,613 psi | 72% | 2313 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,581 psi | 65% | 2274 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,319 psi | 63% | 2224 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,098 psi | 54% | 2175 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,699 psi | 70% | 2365 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 42,714 psi | 70% | 2411 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 40,843 psi | 67% | 2247 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 36,854 psi | 61% | 2221 fps | 98.1% |
| Bofors RP30 | <<locked>> | 80% | 30,574 psi | 50% | 2116 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 39,581 psi | 65% | 2274 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 80% | 31,575 psi | 52% | 2113 fps | 96% |
| Hodgdon H4831 | <<locked>> | 80% | 41,510 psi | 68% | 2267 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,886 psi | 67% | 2254 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,427 psi | 78% | 2300 fps | 100% |
| Hodgdon Retumbo | 72.3 gr | 80% | 32,372 psi | 53% | 2205 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,181 psi | 46% | 1355 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,371 psi | 81% | 2349 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 49,574 psi | 81% | 2352 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,931 psi | 70% | 2260 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 80% | 37,739 psi | 62% | 2254 fps | 97.4% |
| IMR 8133 Enduron | <<locked>> | 88% | 31,299 psi | 51% | 2152 fps | 95.4% |
| Lovex S070 | <<locked>> | 80% | 51,358 psi | 84% | 2372 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,316 psi | 56% | 2110 fps | 99.3% |
| Norma 204 | <<locked>> | 80% | 49,806 psi | 82% | 2395 fps | 99.8% |
| Norma 217 | <<locked>> | 84% | 27,441 psi | 45% | 2073 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 41,684 psi | 68% | 2333 fps | 99.8% |
| Norma URP | <<locked>> | 80% | 51,010 psi | 84% | 2385 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,434 psi | 61% | 2260 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 80% | 49,748 psi | 82% | 2395 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,504 psi | 55% | 2159 fps | 98.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,935 psi | 48% | 1391 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,807 psi | 83% | 2448 fps | 100% |
| ReloadSwiss RS 76 | 77.4 gr | 80% | 31,314 psi | 51% | 2182 fps | 98.3% |
| ReloadSwiss RS 80 | 83.8 gr | 86% | 35,070 psi | 58% | 2254 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 44,773 psi | 74% | 2293 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 80% | 43,250 psi | 71% | 2303 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 51,358 psi | 84% | 2372 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,902 psi | 70% | 2300 fps | 99.4% |
| Somchem S361 | <<locked>> | 80% | 45,440 psi | 75% | 2287 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 48,530 psi | 80% | 2346 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,627 psi | 72% | 2283 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 38,014 psi | 62% | 2182 fps | 98.9% |
| Vihtavuori N170 | <<locked>> | 92% | 47,877 psi | 79% | 2375 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 51,750 psi | 85% | 2385 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,815 psi | 70% | 2287 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,539 psi | 68% | 2329 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 80% | 34,461 psi | 57% | 2178 fps | 96% |
| Vihtavuori N568 | <<locked>> | 86% | 36,651 psi | 60% | 2270 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 92% | 42,786 psi | 70% | 2421 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,561 psi | 85% | 2339 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,389 psi | 58% | 2270 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,914 psi | 66% | 2224 fps | 98.8% |
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 62 powders for .338 Lapua Mag. loaded with the .338 | 300gr | Hornady HPBT. Hodgdon Retumbo delivers the highest muzzle velocity at 2,621 fps; across all powders the maximum-charge window runs from 1,522 fps to 2,621 fps. ADI AR 2218 gives the best case fill at 100 %, and 62 of the 62 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 1:12.0 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, ReloadSwiss RS 80 rank at the top here: for .338 Lapua Mag. with the .338 | 300gr | Hornady HPBT 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.