Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 300gr | Lapua Scenar bullet and 63 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>> | 90% | 54,926 psi | 90% | 2431 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 52,881 psi | 87% | 2520 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 88% | 53,563 psi | 88% | 2526 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 86% | 52,968 psi | 87% | 2457 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 54,520 psi | 90% | 2520 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 98% | 52,518 psi | 86% | 2497 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 48,631 psi | 80% | 2533 fps | 97.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,676 psi | 83% | 2520 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 53,214 psi | 87% | 2457 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 53,388 psi | 88% | 2444 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 52,634 psi | 86% | 2451 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 54,911 psi | 90% | 2516 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 53,084 psi | 87% | 2438 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 52,373 psi | 86% | 2497 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 52,953 psi | 87% | 2513 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,055 psi | 87% | 2579 fps | 98.2% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 52,098 psi | 86% | 2441 fps | 98% |
| Bofors RP15 | <<locked>> | 92% | 54,128 psi | 89% | 2507 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 52,185 psi | 86% | 2510 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 54,911 psi | 90% | 2516 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 54,012 psi | 89% | 2516 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,128 psi | 89% | 2464 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 53,171 psi | 87% | 2451 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 53,650 psi | 88% | 2379 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 55,085 psi | 90% | 2621 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,594 psi | 62% | 1519 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 52,504 psi | 86% | 2392 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 52,779 psi | 87% | 2395 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 54,940 psi | 90% | 2444 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 90% | 52,866 psi | 87% | 2507 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,195 psi | 76% | 2448 fps | 99.4% |
| Lovex S070 | <<locked>> | 82% | 54,578 psi | 90% | 2415 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 52,939 psi | 87% | 2405 fps | 100% |
| Norma 204 | <<locked>> | 82% | 53,040 psi | 87% | 2441 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 46,775 psi | 77% | 2467 fps | 100% |
| Norma MRP | <<locked>> | 88% | 54,897 psi | 90% | 2533 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,317 psi | 89% | 2428 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 53,476 psi | 88% | 2523 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 52,939 psi | 87% | 2438 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 51,808 psi | 85% | 2464 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,551 psi | 63% | 1558 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,201 psi | 89% | 2490 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 51,430 psi | 84% | 2562 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 54,505 psi | 89% | 2585 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 86% | 53,824 psi | 88% | 2431 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 86% | 52,243 psi | 86% | 2441 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 54,578 psi | 90% | 2415 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,013 psi | 90% | 2375 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 51,880 psi | 85% | 2438 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 51,692 psi | 85% | 2382 fps | 99.3% |
| Somchem S365 | <<locked>> | 84% | 55,114 psi | 90% | 2428 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 52,750 psi | 87% | 2418 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 52,315 psi | 86% | 2405 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 54,389 psi | 89% | 2470 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 82% | 54,853 psi | 90% | 2425 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 51,648 psi | 85% | 2415 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 54,549 psi | 90% | 2536 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 94% | 54,737 psi | 90% | 2526 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 96% | 51,735 psi | 85% | 2533 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 98% | 52,547 psi | 86% | 2582 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 54,853 psi | 90% | 2379 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 51,314 psi | 84% | 2510 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 52,214 psi | 86% | 2415 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% | 39,566 psi | 65% | 2205 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 43,062 psi | 71% | 2365 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 80% | 40,582 psi | 67% | 2313 fps | 97.1% |
| ADI AR 2209 | <<locked>> | 80% | 43,540 psi | 71% | 2313 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 38,827 psi | 64% | 2264 fps | 97.6% |
| ADI AR 2217 | <<locked>> | 84% | 33,054 psi | 54% | 2146 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 96% | 42,279 psi | 69% | 2408 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 26,527 psi | 44% | 2021 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,947 psi | 72% | 2316 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,125 psi | 82% | 2402 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,540 psi | 71% | 2310 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,349 psi | 65% | 2270 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,218 psi | 63% | 2221 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,011 psi | 54% | 2172 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,424 psi | 70% | 2362 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 42,525 psi | 70% | 2408 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 40,683 psi | 67% | 2244 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 36,753 psi | 60% | 2218 fps | 98.1% |
| Bofors RP30 | <<locked>> | 80% | 30,516 psi | 50% | 2113 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 39,349 psi | 65% | 2270 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 80% | 31,502 psi | 52% | 2110 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 80% | 41,423 psi | 68% | 2264 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,654 psi | 67% | 2251 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,152 psi | 77% | 2293 fps | 100% |
| Hodgdon Retumbo | 72.1 gr | 80% | 32,285 psi | 53% | 2201 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,137 psi | 46% | 1355 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,298 psi | 81% | 2346 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 49,472 psi | 81% | 2349 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,873 psi | 70% | 2257 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 80% | 37,652 psi | 62% | 2251 fps | 97.4% |
| IMR 8133 Enduron | <<locked>> | 88% | 31,125 psi | 51% | 2149 fps | 95.2% |
| Lovex S070 | <<locked>> | 80% | 51,285 psi | 84% | 2369 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,200 psi | 56% | 2106 fps | 99.3% |
| Norma 204 | <<locked>> | 80% | 49,719 psi | 82% | 2392 fps | 99.8% |
| Norma 217 | <<locked>> | 84% | 27,383 psi | 45% | 2070 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 41,568 psi | 68% | 2333 fps | 99.8% |
| Norma URP | <<locked>> | 80% | 50,937 psi | 84% | 2385 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,376 psi | 61% | 2257 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 80% | 49,690 psi | 82% | 2392 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,286 psi | 55% | 2156 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,906 psi | 47% | 1388 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,502 psi | 83% | 2441 fps | 100% |
| ReloadSwiss RS 76 | 77.1 gr | 80% | 31,140 psi | 51% | 2178 fps | 98.2% |
| ReloadSwiss RS 80 | 83.6 gr | 86% | 34,969 psi | 57% | 2251 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 44,512 psi | 73% | 2290 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 80% | 42,989 psi | 71% | 2300 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 51,285 psi | 84% | 2369 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,590 psi | 85% | 2329 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,670 psi | 70% | 2297 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 45,237 psi | 74% | 2283 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 48,457 psi | 80% | 2346 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,395 psi | 71% | 2277 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 80% | 37,927 psi | 62% | 2178 fps | 98.8% |
| Vihtavuori N170 | <<locked>> | 92% | 47,688 psi | 78% | 2372 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 51,517 psi | 85% | 2382 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,699 psi | 70% | 2283 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,481 psi | 68% | 2326 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 80% | 34,258 psi | 56% | 2175 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 86% | 36,463 psi | 60% | 2264 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 92% | 42,583 psi | 70% | 2415 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,314 psi | 84% | 2336 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,244 psi | 58% | 2270 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,856 psi | 65% | 2221 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 63 powders for .338 Lapua Mag. loaded with the .338 | 300gr | Lapua Scenar. Hodgdon Retumbo delivers the highest muzzle velocity at 2,621 fps; across all powders the maximum-charge window runs from 1,519 fps to 2,621 fps. ADI AR 2218 gives the best case fill at 100 %, and 63 of the 63 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 1:11.5 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 | Lapua Scenar 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.