Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 300gr | MAKER Expanding Subsonic bullet and 66 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% | 53,403 psi | 88% | 2405 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 54,650 psi | 90% | 2421 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 51,953 psi | 85% | 2497 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 86% | 51,648 psi | 85% | 2431 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 53,040 psi | 87% | 2493 fps | 99.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,563 psi | 90% | 2516 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 47,210 psi | 78% | 2493 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,110 psi | 81% | 2490 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 52,185 psi | 86% | 2421 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 54,781 psi | 90% | 2474 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 53,417 psi | 88% | 2490 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 54,824 psi | 90% | 2454 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 54,273 psi | 89% | 2516 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 51,329 psi | 84% | 2487 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 51,155 psi | 84% | 2546 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 54,259 psi | 89% | 2464 fps | 98.2% |
| Bofors RP15 | <<locked>> | 92% | 52,649 psi | 86% | 2480 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 53,969 psi | 89% | 2530 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 53,417 psi | 88% | 2490 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 52,533 psi | 86% | 2487 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 52,736 psi | 87% | 2438 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 51,750 psi | 85% | 2421 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 52,330 psi | 86% | 2356 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 53,171 psi | 87% | 2589 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,420 psi | 61% | 1509 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 54,578 psi | 90% | 2411 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 54,810 psi | 90% | 2411 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 53,809 psi | 88% | 2421 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 92% | 54,839 psi | 90% | 2526 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,686 psi | 73% | 2415 fps | 99.2% |
| Lovex S065 | <<locked>> | 82% | 55,027 psi | 90% | 2388 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 53,417 psi | 88% | 2392 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 54,824 psi | 90% | 2421 fps | 100% |
| Norma 204 | <<locked>> | 82% | 51,909 psi | 85% | 2415 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 45,194 psi | 74% | 2441 fps | 100% |
| Norma MRP | <<locked>> | 88% | 53,142 psi | 87% | 2503 fps | 100% |
| Norma URP | <<locked>> | 82% | 53,040 psi | 87% | 2405 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 51,880 psi | 85% | 2493 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 51,793 psi | 85% | 2415 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 53,925 psi | 89% | 2487 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,392 psi | 63% | 1545 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 54,563 psi | 90% | 2441 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 52,765 psi | 87% | 2467 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 53,577 psi | 88% | 2585 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 52,620 psi | 86% | 2552 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 86% | 52,765 psi | 87% | 2408 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 88% | 54,433 psi | 89% | 2464 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,027 psi | 90% | 2388 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 53,417 psi | 88% | 2392 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 53,896 psi | 88% | 2352 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 54,027 psi | 89% | 2461 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 53,954 psi | 89% | 2405 fps | 99.4% |
| Somchem S365 | <<locked>> | 84% | 53,780 psi | 88% | 2408 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 54,752 psi | 90% | 2438 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 54,592 psi | 90% | 2395 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 54,433 psi | 89% | 2425 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 52,895 psi | 87% | 2441 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 82% | 53,664 psi | 88% | 2402 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 53,650 psi | 88% | 2434 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 52,895 psi | 87% | 2507 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 94% | 53,185 psi | 87% | 2500 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 98% | 53,635 psi | 88% | 2556 fps | 99.2% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 54,534 psi | 90% | 2605 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 53,635 psi | 88% | 2359 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 53,272 psi | 87% | 2533 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 54,418 psi | 89% | 2434 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% | 38,450 psi | 63% | 2182 fps | 99.8% |
| Accurate 4350 | <<locked>> | 80% | 50,995 psi | 84% | 2375 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 39,378 psi | 65% | 2283 fps | 96.6% |
| ADI AR 2209 | <<locked>> | 80% | 42,395 psi | 70% | 2287 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 80% | 37,942 psi | 62% | 2238 fps | 97.2% |
| ADI AR 2217 | <<locked>> | 84% | 32,242 psi | 53% | 2119 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 98% | 43,947 psi | 72% | 2434 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 25,773 psi | 42% | 1995 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,907 psi | 80% | 2379 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,453 psi | 70% | 2283 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,392 psi | 63% | 2247 fps | 98.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,159 psi | 61% | 2198 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,039 psi | 53% | 2146 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,191 psi | 68% | 2336 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 41,176 psi | 68% | 2375 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 42,424 psi | 70% | 2270 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 35,665 psi | 59% | 2192 fps | 97.7% |
| Bofors RP30 | <<locked>> | 82% | 31,662 psi | 52% | 2136 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 38,392 psi | 63% | 2247 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 80% | 30,676 psi | 50% | 2083 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 80% | 40,379 psi | 66% | 2238 fps | 97.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 39,769 psi | 65% | 2228 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,006 psi | 76% | 2274 fps | 100% |
| Hodgdon Retumbo | 70.3 gr | 80% | 31,357 psi | 51% | 2172 fps | 97% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,210 psi | 46% | 1348 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,138 psi | 79% | 2323 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 48,399 psi | 79% | 2329 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,872 psi | 69% | 2234 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 80% | 36,608 psi | 60% | 2221 fps | 96.9% |
| IMR 8133 Enduron | <<locked>> | 90% | 32,155 psi | 53% | 2169 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 51,764 psi | 85% | 2346 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,096 psi | 82% | 2346 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 33,243 psi | 55% | 2080 fps | 99% |
| Norma 204 | <<locked>> | 80% | 48,559 psi | 80% | 2365 fps | 99.7% |
| Norma 217 | <<locked>> | 84% | 26,527 psi | 44% | 2044 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 40,248 psi | 66% | 2303 fps | 99.6% |
| Norma URP | <<locked>> | 80% | 49,603 psi | 81% | 2359 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 36,187 psi | 59% | 2228 fps | 97.2% |
| Ramshot Hunter | <<locked>> | 80% | 48,515 psi | 80% | 2369 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 32,372 psi | 53% | 2129 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,834 psi | 47% | 1378 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,082 psi | 84% | 2398 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,240 psi | 81% | 2418 fps | 100% |
| ReloadSwiss RS 76 | 75.2 gr | 80% | 30,197 psi | 50% | 2149 fps | 97.7% |
| ReloadSwiss RS 80 | 83.4 gr | 88% | 36,274 psi | 60% | 2274 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 43,584 psi | 72% | 2267 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 80% | 41,959 psi | 69% | 2274 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,764 psi | 85% | 2346 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,096 psi | 82% | 2346 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,691 psi | 83% | 2310 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,640 psi | 68% | 2270 fps | 99.1% |
| Somchem S361 | <<locked>> | 80% | 44,309 psi | 73% | 2260 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 47,050 psi | 77% | 2323 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,453 psi | 70% | 2257 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 51,140 psi | 84% | 2352 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,883 psi | 61% | 2152 fps | 98.5% |
| Vihtavuori N170 | <<locked>> | 94% | 49,516 psi | 81% | 2392 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 50,328 psi | 83% | 2359 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,452 psi | 68% | 2260 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 40,219 psi | 66% | 2297 fps | 97.4% |
| Vihtavuori N565 | <<locked>> | 80% | 33,243 psi | 55% | 2146 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 88% | 37,869 psi | 62% | 2290 fps | 95.7% |
| Vihtavuori N570 | <<locked>> | 94% | 44,135 psi | 72% | 2438 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,067 psi | 82% | 2313 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,881 psi | 56% | 2244 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,812 psi | 64% | 2195 fps | 98.5% |
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 72 powders for .338 Lapua Mag. loaded with the .338 | 300gr | MAKER Expanding Subsonic. Vihtavuori N570 delivers the highest muzzle velocity at 2,605 fps; across all powders the maximum-charge window runs from 1,509 fps to 2,605 fps. Accurate 8700 gives the best case fill at 100 %, and 72 of the 72 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 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2217, ADI AR 2218 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 | MAKER Expanding Subsonic they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, 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.