Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 300gr | MAKER Solid Copper bullet and 70 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 Alliant Reloder-26.
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>> | 92% | 55,085 psi | 90% | 2418 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 52,620 psi | 86% | 2388 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 53,563 psi | 88% | 2513 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 88% | 53,330 psi | 88% | 2448 fps | 100% |
| ADI AR 2213 | <<locked>> | 92% | 54,636 psi | 90% | 2507 fps | 99.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,504 psi | 86% | 2477 fps | 99.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,992 psi | 77% | 2451 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 53,780 psi | 88% | 2438 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 52,968 psi | 87% | 2441 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 92% | 54,882 psi | 90% | 2503 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 52,881 psi | 87% | 2425 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 52,025 psi | 85% | 2484 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 52,794 psi | 87% | 2503 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 48,747 psi | 80% | 2500 fps | 97% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,634 psi | 86% | 2428 fps | 97.7% |
| Bofors RP15 | <<locked>> | 94% | 54,085 psi | 89% | 2490 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 51,648 psi | 85% | 2490 fps | 99.8% |
| Bofors RP5 | <<locked>> | 92% | 54,882 psi | 90% | 2503 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 54,766 psi | 90% | 2388 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 54,172 psi | 89% | 2500 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 54,056 psi | 89% | 2438 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 54,462 psi | 89% | 2451 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 53,432 psi | 88% | 2438 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 53,838 psi | 88% | 2365 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 54,534 psi | 90% | 2602 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 54,375 psi | 89% | 2474 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,318 psi | 61% | 1493 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 52,895 psi | 87% | 2382 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 53,185 psi | 87% | 2385 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 52,156 psi | 86% | 2388 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 92% | 52,750 psi | 87% | 2490 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,627 psi | 70% | 2379 fps | 98.7% |
| Lovex S065 | <<locked>> | 82% | 53,417 psi | 88% | 2359 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 51,851 psi | 85% | 2362 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 52,750 psi | 87% | 2388 fps | 100% |
| Norma 204 | <<locked>> | 84% | 53,621 psi | 88% | 2431 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 42,772 psi | 70% | 2395 fps | 99.9% |
| Norma MRP | <<locked>> | 90% | 54,781 psi | 90% | 2520 fps | 100% |
| Norma URP | <<locked>> | 84% | 54,781 psi | 90% | 2421 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 53,403 psi | 88% | 2510 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 84% | 53,359 psi | 88% | 2428 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 51,619 psi | 85% | 2451 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,290 psi | 63% | 1532 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 52,533 psi | 86% | 2411 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,462 psi | 89% | 2480 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,824 psi | 90% | 2595 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,911 psi | 89% | 2566 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 88% | 54,331 psi | 89% | 2418 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 88% | 52,489 psi | 86% | 2428 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 54,766 psi | 90% | 2388 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 53,417 psi | 88% | 2359 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 51,851 psi | 85% | 2362 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 52,475 psi | 86% | 2323 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 52,083 psi | 86% | 2428 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 52,083 psi | 86% | 2369 fps | 99.1% |
| Somchem S365 | <<locked>> | 84% | 51,764 psi | 85% | 2379 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 52,968 psi | 87% | 2408 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 52,750 psi | 87% | 2365 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 52,591 psi | 86% | 2395 fps | 100% |
| Vihtavuori N170 | <<locked>> | 98% | 54,433 psi | 89% | 2454 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 82% | 51,967 psi | 85% | 2372 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,042 psi | 90% | 2448 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 54,549 psi | 90% | 2523 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 96% | 54,563 psi | 90% | 2510 fps | 99.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,071 psi | 90% | 2566 fps | 99.2% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 51,924 psi | 85% | 2562 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 51,895 psi | 85% | 2329 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 54,273 psi | 89% | 2441 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 54,607 psi | 90% | 2546 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 52,504 psi | 86% | 2402 fps | 99.9% |
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% | 36,970 psi | 61% | 2149 fps | 99.6% |
| Accurate 4350 | <<locked>> | 80% | 49,197 psi | 81% | 2343 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 37,826 psi | 62% | 2247 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 41,002 psi | 67% | 2257 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 36,608 psi | 60% | 2201 fps | 96.5% |
| ADI AR 2217 | <<locked>> | 86% | 33,141 psi | 54% | 2133 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 82% | 26,440 psi | 43% | 2008 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,253 psi | 78% | 2349 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,944 psi | 67% | 2251 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,898 psi | 61% | 2211 fps | 98% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,679 psi | 59% | 2172 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,893 psi | 51% | 2113 fps | 99.1% |
| Alliant Reloder-26 | 72.6 gr | 80% | 39,218 psi | 64% | 2303 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 42,163 psi | 69% | 2385 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 43,874 psi | 72% | 2283 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 34,374 psi | 56% | 2159 fps | 97.1% |
| Bofors RP30 | <<locked>> | 84% | 32,329 psi | 53% | 2149 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 36,898 psi | 61% | 2211 fps | 98% |
| Bofors RP7 | <<locked>> | 80% | 51,401 psi | 84% | 2343 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 31,604 psi | 52% | 2096 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 50,705 psi | 83% | 2392 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 39,001 psi | 64% | 2205 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 38,377 psi | 63% | 2192 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,454 psi | 73% | 2244 fps | 100% |
| Hodgdon Retumbo | 67.9 gr | 80% | 30,153 psi | 50% | 2133 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 50,546 psi | 83% | 2421 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,123 psi | 46% | 1335 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,833 psi | 77% | 2293 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 46,717 psi | 77% | 2297 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,683 psi | 67% | 2205 fps | 97.2% |
| IMR 7828 SSC | <<locked>> | 80% | 35,259 psi | 58% | 2185 fps | 96.2% |
| IMR 8133 Enduron | <<locked>> | 92% | 32,880 psi | 54% | 2182 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 50,357 psi | 83% | 2320 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,660 psi | 80% | 2316 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 32,024 psi | 53% | 2051 fps | 98.6% |
| Norma 204 | <<locked>> | 80% | 46,905 psi | 77% | 2333 fps | 99.5% |
| Norma 217 | <<locked>> | 86% | 27,064 psi | 44% | 2054 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 38,696 psi | 64% | 2270 fps | 99.4% |
| Norma URP | <<locked>> | 80% | 48,095 psi | 79% | 2333 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 34,824 psi | 57% | 2192 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 80% | 46,818 psi | 77% | 2336 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 31,053 psi | 51% | 2093 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,747 psi | 47% | 1368 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,226 psi | 81% | 2365 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,224 psi | 78% | 2385 fps | 100% |
| ReloadSwiss RS 76 | 72.7 gr | 80% | 29,066 psi | 48% | 2110 fps | 96.9% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 37,188 psi | 61% | 2287 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 42,293 psi | 69% | 2238 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 80% | 40,408 psi | 66% | 2241 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 80% | 51,401 psi | 84% | 2343 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,357 psi | 83% | 2320 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,660 psi | 80% | 2316 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,197 psi | 81% | 2280 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,074 psi | 66% | 2238 fps | 98.7% |
| Somchem S361 | <<locked>> | 80% | 42,786 psi | 70% | 2228 fps | 97.6% |
| Somchem S365 | <<locked>> | 80% | 45,440 psi | 75% | 2293 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,988 psi | 67% | 2224 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 49,443 psi | 81% | 2323 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,520 psi | 58% | 2119 fps | 98% |
| Vihtavuori N170 | <<locked>> | 96% | 51,010 psi | 84% | 2405 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 48,762 psi | 80% | 2329 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,885 psi | 65% | 2231 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 38,769 psi | 64% | 2264 fps | 96.8% |
| Vihtavuori N565 | <<locked>> | 82% | 34,084 psi | 56% | 2162 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 90% | 38,740 psi | 64% | 2300 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 96% | 45,237 psi | 74% | 2451 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,515 psi | 80% | 2287 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,908 psi | 84% | 2395 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 31,937 psi | 52% | 2208 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,478 psi | 62% | 2165 fps | 98% |
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 76 powders for .338 Lapua Mag. loaded with the .338 | 300gr | MAKER Solid Copper . Hodgdon Retumbo delivers the highest muzzle velocity at 2,602 fps; across all powders the maximum-charge window runs from 1,493 fps to 2,602 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 61–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.338" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, 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. Hodgdon Retumbo, ReloadSwiss RS 76, Alliant Reloder-26 rank at the top here: for .338 Lapua Mag. with the .338 | 300gr | MAKER Solid Copper they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-50, IMR 7977 Enduron, Lovex D100 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.