Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 275gr | Speer SSP bullet and 61 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% | 54,636 psi | 90% | 2546 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 53,316 psi | 88% | 2641 fps | 99% |
| ADI AR 2209 | <<locked>> | 86% | 52,620 psi | 86% | 2572 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 54,186 psi | 89% | 2635 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 98% | 52,315 psi | 86% | 2608 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 48,559 psi | 80% | 2635 fps | 96.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,488 psi | 83% | 2631 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 53,069 psi | 87% | 2562 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 52,446 psi | 86% | 2566 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 54,563 psi | 90% | 2631 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 52,620 psi | 86% | 2549 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 52,127 psi | 86% | 2612 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 52,576 psi | 86% | 2628 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 52,794 psi | 87% | 2687 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 51,953 psi | 85% | 2552 fps | 97.4% |
| Bofors RP15 | <<locked>> | 92% | 53,969 psi | 89% | 2621 fps | 99.9% |
| Bofors RP30 | <<locked>> | 96% | 51,880 psi | 85% | 2621 fps | 99.7% |
| Bofors RP5 | <<locked>> | 90% | 54,563 psi | 90% | 2631 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 53,795 psi | 88% | 2628 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 53,954 psi | 89% | 2579 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 88% | 52,852 psi | 87% | 2562 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 53,345 psi | 88% | 2497 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 54,621 psi | 90% | 2736 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,579 psi | 62% | 1608 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 52,040 psi | 85% | 2503 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 52,489 psi | 86% | 2510 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 54,621 psi | 90% | 2559 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 90% | 52,547 psi | 86% | 2618 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,064 psi | 76% | 2552 fps | 99% |
| Lovex S070 | <<locked>> | 82% | 54,201 psi | 89% | 2530 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 52,605 psi | 86% | 2516 fps | 100% |
| Norma 204 | <<locked>> | 82% | 52,823 psi | 87% | 2552 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 46,572 psi | 76% | 2575 fps | 100% |
| Norma MRP | <<locked>> | 88% | 54,418 psi | 89% | 2644 fps | 100% |
| Norma URP | <<locked>> | 82% | 53,896 psi | 88% | 2543 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 53,200 psi | 87% | 2638 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 52,721 psi | 87% | 2552 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 51,561 psi | 85% | 2575 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,464 psi | 63% | 1647 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,027 psi | 89% | 2608 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 51,155 psi | 84% | 2674 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 54,418 psi | 89% | 2697 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 86% | 53,606 psi | 88% | 2546 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 86% | 52,083 psi | 86% | 2556 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 82% | 54,201 psi | 89% | 2530 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 54,708 psi | 90% | 2487 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 51,706 psi | 85% | 2552 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 54,781 psi | 90% | 2539 fps | 99.3% |
| Somchem S365 | <<locked>> | 84% | 54,766 psi | 90% | 2546 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 52,460 psi | 86% | 2530 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 52,098 psi | 86% | 2520 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 54,201 psi | 89% | 2582 fps | 96.1% |
| Vihtavuori N550 | <<locked>> | 82% | 54,708 psi | 90% | 2543 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 54,665 psi | 90% | 2572 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 54,070 psi | 89% | 2648 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 94% | 54,534 psi | 90% | 2641 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 96% | 51,474 psi | 85% | 2641 fps | 98.6% |
| Vihtavuori N570 | <<locked>> | 98% | 52,315 psi | 86% | 2694 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 54,650 psi | 90% | 2493 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 55,071 psi | 90% | 2677 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 51,967 psi | 85% | 2526 fps | 99.8% |
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% | 39,291 psi | 65% | 2306 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 80% | 40,321 psi | 66% | 2411 fps | 96.2% |
| ADI AR 2209 | <<locked>> | 80% | 43,149 psi | 71% | 2415 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 80% | 38,624 psi | 63% | 2362 fps | 96.8% |
| ADI AR 2217 | <<locked>> | 86% | 35,128 psi | 58% | 2290 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 98% | 45,107 psi | 74% | 2569 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 82% | 28,007 psi | 46% | 2152 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,835 psi | 82% | 2516 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,265 psi | 71% | 2415 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,175 psi | 64% | 2372 fps | 98.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,927 psi | 62% | 2323 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,677 psi | 54% | 2260 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,192 psi | 69% | 2467 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 45,614 psi | 75% | 2566 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,105 psi | 71% | 2395 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 36,419 psi | 60% | 2313 fps | 97.3% |
| Bofors RP30 | <<locked>> | 82% | 32,387 psi | 53% | 2251 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 39,175 psi | 64% | 2372 fps | 98.2% |
| Hodgdon H1000 | <<locked>> | 82% | 33,373 psi | 55% | 2251 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 80% | 41,191 psi | 68% | 2365 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,466 psi | 66% | 2352 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,920 psi | 77% | 2405 fps | 100% |
| Hodgdon Retumbo | 76.8 gr | 80% | 31,995 psi | 53% | 2290 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,123 psi | 46% | 1434 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,878 psi | 80% | 2454 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 49,226 psi | 81% | 2461 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,525 psi | 70% | 2359 fps | 97.4% |
| IMR 7828 SSC | <<locked>> | 80% | 37,347 psi | 61% | 2346 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 90% | 32,938 psi | 54% | 2287 fps | 95.1% |
| Lovex S070 | <<locked>> | 80% | 50,894 psi | 84% | 2480 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 33,866 psi | 56% | 2198 fps | 98.8% |
| Norma 204 | <<locked>> | 80% | 49,356 psi | 81% | 2500 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 28,979 psi | 48% | 2205 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 41,263 psi | 68% | 2434 fps | 99.5% |
| Norma URP | <<locked>> | 80% | 50,531 psi | 83% | 2497 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,014 psi | 61% | 2352 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 80% | 49,313 psi | 81% | 2503 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,112 psi | 54% | 2247 fps | 97.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,834 psi | 47% | 1470 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,183 psi | 82% | 2556 fps | 100% |
| ReloadSwiss RS 76 | 82.2 gr | 80% | 30,966 psi | 51% | 2264 fps | 97.3% |
| ReloadSwiss RS 80 | 91.1 gr | 88% | 37,362 psi | 61% | 2398 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 44,382 psi | 73% | 2395 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 80% | 42,743 psi | 70% | 2405 fps | 99% |
| Shooters World SW4350 | <<locked>> | 80% | 50,894 psi | 84% | 2480 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,314 psi | 84% | 2441 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,424 psi | 70% | 2398 fps | 98.9% |
| Somchem S361 | <<locked>> | 80% | 44,991 psi | 74% | 2385 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 47,950 psi | 79% | 2457 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,207 psi | 71% | 2385 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 80% | 37,666 psi | 62% | 2277 fps | 98.3% |
| Vihtavuori N170 | <<locked>> | 94% | 50,676 psi | 83% | 2526 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 51,213 psi | 84% | 2493 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,409 psi | 70% | 2392 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,191 psi | 68% | 2428 fps | 97.1% |
| Vihtavuori N565 | <<locked>> | 82% | 36,405 psi | 60% | 2320 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 88% | 38,827 psi | 64% | 2415 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 94% | 45,382 psi | 75% | 2572 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,140 psi | 84% | 2451 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 34,838 psi | 57% | 2365 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,595 psi | 65% | 2320 fps | 98.2% |
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 61 powders for .338 Lapua Mag. loaded with the .338 | 275gr | Speer SSP. Hodgdon Retumbo delivers the highest muzzle velocity at 2,736 fps; across all powders the maximum-charge window runs from 1,608 fps to 2,736 fps. ADI AR 2218 gives the best case fill at 100 %, and 61 of the 61 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 275.0 gr projectile in 0.338" calls for a 1:16.0 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 | 275gr | Speer SSP 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.