Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 300gr | Sierra HPBT LR MatchKing bullet and 60 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 51,692 psi | 85% | 2392 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 53,171 psi | 87% | 2526 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 53,853 psi | 88% | 2533 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 86% | 53,272 psi | 87% | 2464 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 54,824 psi | 90% | 2526 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 98% | 52,968 psi | 87% | 2507 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 48,965 psi | 80% | 2539 fps | 97.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,923 psi | 84% | 2523 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 53,490 psi | 88% | 2461 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 53,737 psi | 88% | 2451 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 52,910 psi | 87% | 2457 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 51,721 psi | 85% | 2474 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 53,156 psi | 87% | 2441 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 52,881 psi | 87% | 2507 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 53,287 psi | 87% | 2520 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,301 psi | 88% | 2585 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 52,286 psi | 86% | 2448 fps | 98.1% |
| Bofors RP15 | <<locked>> | 92% | 54,418 psi | 89% | 2513 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 52,446 psi | 86% | 2516 fps | 99.9% |
| Bofors RP5 | <<locked>> | 88% | 51,721 psi | 85% | 2474 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 54,462 psi | 89% | 2523 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,418 psi | 89% | 2470 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 53,417 psi | 88% | 2457 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 53,780 psi | 88% | 2382 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 51,750 psi | 85% | 2575 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,536 psi | 62% | 1522 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 52,620 psi | 86% | 2395 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 52,924 psi | 87% | 2395 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 51,895 psi | 85% | 2405 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 90% | 53,185 psi | 87% | 2513 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,673 psi | 77% | 2454 fps | 99.5% |
| Lovex S070 | <<locked>> | 82% | 54,708 psi | 90% | 2418 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 53,200 psi | 87% | 2411 fps | 100% |
| Norma 204 | <<locked>> | 82% | 53,359 psi | 88% | 2444 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 47,079 psi | 77% | 2474 fps | 100% |
| Norma MRP | <<locked>> | 86% | 51,488 psi | 85% | 2487 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,491 psi | 89% | 2431 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 53,795 psi | 88% | 2530 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 53,272 psi | 87% | 2444 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 52,069 psi | 85% | 2470 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,493 psi | 63% | 1558 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,549 psi | 90% | 2497 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 51,721 psi | 85% | 2566 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 54,984 psi | 90% | 2595 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 86% | 54,128 psi | 89% | 2438 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 86% | 52,547 psi | 86% | 2448 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 54,708 psi | 90% | 2418 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 52,156 psi | 86% | 2444 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 51,779 psi | 85% | 2385 fps | 99.3% |
| Somchem S365 | <<locked>> | 82% | 51,953 psi | 85% | 2392 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 53,069 psi | 87% | 2425 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 52,605 psi | 86% | 2411 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 54,781 psi | 90% | 2477 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 86% | 51,967 psi | 85% | 2421 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 54,853 psi | 90% | 2543 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 94% | 55,042 psi | 90% | 2533 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 96% | 52,011 psi | 85% | 2539 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 98% | 52,837 psi | 87% | 2589 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 90% | 51,924 psi | 85% | 2520 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 52,489 psi | 86% | 2421 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% | 39,711 psi | 65% | 2211 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 43,163 psi | 71% | 2369 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 80% | 40,712 psi | 67% | 2320 fps | 97.1% |
| ADI AR 2209 | <<locked>> | 80% | 43,685 psi | 72% | 2320 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 39,117 psi | 64% | 2270 fps | 97.7% |
| ADI AR 2217 | <<locked>> | 82% | 31,169 psi | 51% | 2100 fps | 95% |
| ADI AR 2218 | <<locked>> | 96% | 42,438 psi | 70% | 2415 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 26,600 psi | 44% | 2028 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,063 psi | 72% | 2320 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,285 psi | 83% | 2405 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,700 psi | 72% | 2316 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,653 psi | 65% | 2277 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,363 psi | 63% | 2224 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,156 psi | 54% | 2175 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,743 psi | 70% | 2365 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 42,888 psi | 70% | 2415 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 40,857 psi | 67% | 2251 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 36,898 psi | 61% | 2224 fps | 98.2% |
| Bofors RP30 | <<locked>> | 80% | 30,647 psi | 50% | 2116 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 39,653 psi | 65% | 2277 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 80% | 31,618 psi | 52% | 2116 fps | 96% |
| Hodgdon H4831 | <<locked>> | 80% | 41,684 psi | 68% | 2270 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,930 psi | 67% | 2257 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,471 psi | 78% | 2300 fps | 100% |
| Hodgdon Retumbo | 72.4 gr | 80% | 32,401 psi | 53% | 2208 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,268 psi | 46% | 1358 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,414 psi | 81% | 2352 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 49,617 psi | 81% | 2352 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,004 psi | 71% | 2264 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 80% | 37,782 psi | 62% | 2254 fps | 97.4% |
| IMR 8133 Enduron | <<locked>> | 88% | 31,343 psi | 51% | 2156 fps | 95.4% |
| Lovex S070 | <<locked>> | 80% | 51,401 psi | 84% | 2375 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,360 psi | 56% | 2110 fps | 99.3% |
| Norma 204 | <<locked>> | 80% | 50,024 psi | 82% | 2398 fps | 99.9% |
| Norma 217 | <<locked>> | 84% | 27,586 psi | 45% | 2077 fps | 96% |
| Norma MRP | <<locked>> | 80% | 41,713 psi | 68% | 2336 fps | 99.8% |
| Norma URP | <<locked>> | 80% | 51,068 psi | 84% | 2388 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,521 psi | 62% | 2264 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 80% | 49,980 psi | 82% | 2398 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,533 psi | 55% | 2162 fps | 98.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,892 psi | 47% | 1391 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,836 psi | 83% | 2448 fps | 100% |
| ReloadSwiss RS 76 | 77.5 gr | 80% | 31,357 psi | 51% | 2185 fps | 98.4% |
| ReloadSwiss RS 80 | 84 gr | 86% | 35,244 psi | 58% | 2257 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 44,817 psi | 74% | 2297 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 80% | 43,294 psi | 71% | 2306 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 51,401 psi | 84% | 2375 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,946 psi | 71% | 2303 fps | 99.4% |
| Somchem S361 | <<locked>> | 80% | 45,469 psi | 75% | 2290 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 48,602 psi | 80% | 2349 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,685 psi | 72% | 2287 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 38,043 psi | 62% | 2182 fps | 98.9% |
| Vihtavuori N170 | <<locked>> | 92% | 47,892 psi | 79% | 2375 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 42,888 psi | 70% | 2290 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,626 psi | 68% | 2329 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 80% | 34,505 psi | 57% | 2182 fps | 96% |
| Vihtavuori N568 | <<locked>> | 86% | 36,709 psi | 60% | 2270 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 92% | 42,844 psi | 70% | 2425 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,578 psi | 58% | 2277 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,118 psi | 66% | 2228 fps | 98.9% |
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 60 powders for .338 Lapua Mag. loaded with the .338 | 300gr | Sierra HPBT LR MatchKing. ReloadSwiss RS 80 delivers the highest muzzle velocity at 2,595 fps; across all powders the maximum-charge window runs from 1,522 fps to 2,595 fps. ADI AR 2218 gives the best case fill at 100 %, and 60 of the 60 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 | Sierra HPBT LR MatchKing 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.