Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 275gr | Speer AGS TS bullet and 62 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% | 55,013 psi | 90% | 2549 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 53,853 psi | 88% | 2648 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 86% | 53,055 psi | 87% | 2579 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 54,723 psi | 90% | 2644 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 98% | 52,750 psi | 87% | 2615 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 48,921 psi | 80% | 2644 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,937 psi | 84% | 2638 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 53,374 psi | 88% | 2579 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 53,505 psi | 88% | 2569 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 52,794 psi | 87% | 2572 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,085 psi | 90% | 2641 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 53,185 psi | 87% | 2559 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 52,663 psi | 86% | 2621 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 53,185 psi | 87% | 2635 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,403 psi | 88% | 2700 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 52,199 psi | 86% | 2556 fps | 97.5% |
| Bofors RP15 | <<locked>> | 92% | 54,302 psi | 89% | 2628 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 52,373 psi | 86% | 2628 fps | 99.8% |
| Bofors RP5 | <<locked>> | 90% | 55,085 psi | 90% | 2641 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 54,302 psi | 89% | 2638 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,288 psi | 89% | 2582 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 88% | 53,185 psi | 87% | 2569 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 53,606 psi | 88% | 2500 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 51,663 psi | 85% | 2694 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,550 psi | 62% | 1611 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 52,431 psi | 86% | 2510 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 52,721 psi | 87% | 2513 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,100 psi | 90% | 2566 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 90% | 52,939 psi | 87% | 2625 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,557 psi | 76% | 2562 fps | 99.1% |
| Lovex S070 | <<locked>> | 82% | 54,578 psi | 90% | 2536 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 53,156 psi | 87% | 2526 fps | 100% |
| Norma 204 | <<locked>> | 82% | 53,200 psi | 87% | 2562 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 47,094 psi | 77% | 2582 fps | 100% |
| Norma MRP | <<locked>> | 88% | 55,013 psi | 90% | 2654 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,302 psi | 89% | 2549 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 53,592 psi | 88% | 2644 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 53,098 psi | 87% | 2559 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 52,040 psi | 85% | 2582 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,435 psi | 63% | 1650 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,433 psi | 89% | 2615 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 51,837 psi | 85% | 2687 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 54,911 psi | 90% | 2707 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 86% | 53,969 psi | 89% | 2552 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 86% | 52,504 psi | 86% | 2566 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 82% | 54,578 psi | 90% | 2536 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,056 psi | 90% | 2493 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 52,127 psi | 86% | 2559 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 51,677 psi | 85% | 2497 fps | 99% |
| Somchem S365 | <<locked>> | 82% | 51,721 psi | 85% | 2510 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 52,837 psi | 87% | 2539 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 52,446 psi | 86% | 2523 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 54,665 psi | 90% | 2589 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 82% | 55,100 psi | 90% | 2549 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 51,837 psi | 85% | 2536 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 54,650 psi | 90% | 2657 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 94% | 54,868 psi | 90% | 2644 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 96% | 51,953 psi | 85% | 2651 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 98% | 52,794 psi | 87% | 2703 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 54,969 psi | 90% | 2500 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 51,779 psi | 85% | 2638 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 52,301 psi | 86% | 2533 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% | 39,508 psi | 65% | 2310 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 80% | 40,669 psi | 67% | 2421 fps | 96.4% |
| ADI AR 2209 | <<locked>> | 80% | 43,526 psi | 71% | 2425 fps | 99% |
| ADI AR 2213 | <<locked>> | 80% | 38,972 psi | 64% | 2372 fps | 97% |
| ADI AR 2217 | <<locked>> | 84% | 33,127 psi | 54% | 2244 fps | 95% |
| ADI AR 2218 | <<locked>> | 98% | 45,600 psi | 75% | 2579 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 82% | 28,268 psi | 46% | 2162 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,903 psi | 72% | 2425 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,096 psi | 82% | 2523 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,497 psi | 71% | 2418 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,523 psi | 65% | 2379 fps | 98.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,319 psi | 63% | 2329 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,011 psi | 54% | 2270 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,612 psi | 70% | 2474 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 46,021 psi | 76% | 2575 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,453 psi | 71% | 2402 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 36,767 psi | 60% | 2323 fps | 97.5% |
| Bofors RP30 | <<locked>> | 82% | 32,576 psi | 53% | 2257 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 39,523 psi | 65% | 2379 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 80% | 31,531 psi | 52% | 2205 fps | 95% |
| Hodgdon H4831 | <<locked>> | 80% | 41,524 psi | 68% | 2372 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,814 psi | 67% | 2359 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,195 psi | 77% | 2411 fps | 100% |
| Hodgdon Retumbo | 77.3 gr | 80% | 32,184 psi | 53% | 2297 fps | 96.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,152 psi | 46% | 1437 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,269 psi | 81% | 2464 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 49,487 psi | 81% | 2467 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,830 psi | 70% | 2365 fps | 97.5% |
| IMR 7828 SSC | <<locked>> | 80% | 37,710 psi | 62% | 2356 fps | 96.7% |
| IMR 8133 Enduron | <<locked>> | 90% | 33,359 psi | 55% | 2297 fps | 95.4% |
| Lovex S070 | <<locked>> | 80% | 51,300 psi | 84% | 2490 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,127 psi | 56% | 2205 fps | 98.9% |
| Norma 204 | <<locked>> | 80% | 49,690 psi | 82% | 2510 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 29,269 psi | 48% | 2211 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 41,655 psi | 68% | 2441 fps | 99.6% |
| Norma URP | <<locked>> | 80% | 50,952 psi | 84% | 2503 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,333 psi | 61% | 2359 fps | 97% |
| Ramshot Hunter | <<locked>> | 80% | 49,690 psi | 82% | 2510 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,417 psi | 55% | 2254 fps | 97.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,863 psi | 47% | 1473 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,604 psi | 83% | 2562 fps | 100% |
| ReloadSwiss RS 76 | 82.8 gr | 80% | 31,270 psi | 51% | 2274 fps | 97.5% |
| ReloadSwiss RS 80 | 91.8 gr | 88% | 37,811 psi | 62% | 2408 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 44,570 psi | 73% | 2402 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 80% | 42,989 psi | 71% | 2408 fps | 99% |
| Shooters World SW4350 | <<locked>> | 80% | 51,300 psi | 84% | 2490 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,692 psi | 85% | 2448 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,641 psi | 70% | 2405 fps | 99% |
| Somchem S361 | <<locked>> | 80% | 45,295 psi | 74% | 2395 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 48,399 psi | 79% | 2464 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,569 psi | 72% | 2392 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 80% | 37,855 psi | 62% | 2280 fps | 98.3% |
| Vihtavuori N170 | <<locked>> | 94% | 51,111 psi | 84% | 2536 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 51,619 psi | 85% | 2503 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,641 psi | 70% | 2395 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,553 psi | 68% | 2434 fps | 97.3% |
| Vihtavuori N565 | <<locked>> | 80% | 34,301 psi | 56% | 2274 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 88% | 39,276 psi | 64% | 2425 fps | 95.5% |
| Vihtavuori N570 | <<locked>> | 94% | 45,832 psi | 75% | 2582 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,488 psi | 85% | 2454 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,273 psi | 58% | 2375 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,900 psi | 66% | 2329 fps | 98.3% |
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 62 powders for .338 Lapua Mag. loaded with the .338 | 275gr | Speer AGS TS. ReloadSwiss RS 80 delivers the highest muzzle velocity at 2,707 fps; across all powders the maximum-charge window runs from 1,611 fps to 2,707 fps. ADI AR 2218 gives the best case fill at 100 %, and 62 of the 62 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 1:16.5 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 | 275gr | Speer AGS TS 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.