Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 260gr | Peregrine Glider GRM bullet and 76 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Winchester StaBALL HD and IMR 7828 SSC.
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>> | 96% | 55,114 psi | 90% | 2605 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 53,185 psi | 87% | 2585 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 53,853 psi | 88% | 2697 fps | 98.2% |
| ADI AR 2208 | <<locked>> | 82% | 54,955 psi | 90% | 2552 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 54,157 psi | 89% | 2641 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 51,924 psi | 85% | 2648 fps | 98.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,180 psi | 76% | 2549 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,857 psi | 67% | 2513 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 54,302 psi | 89% | 2638 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 88% | 54,360 psi | 89% | 2638 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 51,663 psi | 85% | 2602 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 53,635 psi | 88% | 2631 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 51,706 psi | 85% | 2644 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 96% | 52,663 psi | 86% | 2615 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,851 psi | 85% | 2671 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 52,576 psi | 86% | 2697 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 54,070 psi | 89% | 2612 fps | 96.4% |
| Bofors RP15 | <<locked>> | 98% | 54,157 psi | 89% | 2677 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,790 psi | 78% | 2615 fps | 98.6% |
| Bofors RP5 | <<locked>> | 94% | 51,706 psi | 85% | 2644 fps | 99.5% |
| Bofors RP7 | <<locked>> | 84% | 52,678 psi | 86% | 2543 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,039 psi | 84% | 2628 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 84% | 51,576 psi | 85% | 2589 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 54,433 psi | 89% | 2602 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 92% | 51,837 psi | 85% | 2589 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,549 psi | 90% | 2628 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,607 psi | 90% | 2569 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,763 psi | 83% | 2733 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 51,503 psi | 85% | 2621 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,883 psi | 61% | 1608 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 54,201 psi | 89% | 2579 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 54,331 psi | 89% | 2566 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 53,693 psi | 88% | 2582 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 53,243 psi | 87% | 2579 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 96% | 53,316 psi | 88% | 2680 fps | 99% |
| Lovex S065 | <<locked>> | 86% | 54,694 psi | 90% | 2562 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 52,779 psi | 87% | 2559 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,576 psi | 86% | 2572 fps | 100% |
| Norma 204 | <<locked>> | 88% | 54,998 psi | 90% | 2631 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 36,274 psi | 60% | 2438 fps | 97.6% |
| Norma MRP | <<locked>> | 94% | 54,969 psi | 90% | 2713 fps | 100% |
| Norma URP | <<locked>> | 86% | 52,083 psi | 86% | 2575 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 53,780 psi | 88% | 2697 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 88% | 54,375 psi | 89% | 2631 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 51,663 psi | 85% | 2635 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,710 psi | 62% | 1647 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,998 psi | 90% | 2641 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 53,171 psi | 87% | 2608 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 51,503 psi | 85% | 2635 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,053 psi | 84% | 2726 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 45,934 psi | 75% | 2618 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 82% | 53,577 psi | 88% | 2536 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 52,083 psi | 86% | 2562 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 92% | 52,997 psi | 87% | 2621 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 52,678 psi | 86% | 2543 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,694 psi | 90% | 2562 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 52,779 psi | 87% | 2559 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 54,157 psi | 89% | 2425 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 53,853 psi | 88% | 2520 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 52,562 psi | 86% | 2615 fps | 99.5% |
| Somchem S355 | <<locked>> | 82% | 53,577 psi | 88% | 2536 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 53,447 psi | 88% | 2559 fps | 98.3% |
| Somchem S365 | <<locked>> | 88% | 52,040 psi | 85% | 2575 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 53,505 psi | 88% | 2595 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 84% | 54,839 psi | 90% | 2510 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 53,853 psi | 88% | 2569 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 53,040 psi | 87% | 2579 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 86% | 52,924 psi | 87% | 2572 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 54,868 psi | 90% | 2638 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,940 psi | 90% | 2710 fps | 98.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,259 psi | 89% | 2687 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 47,340 psi | 78% | 2628 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 53,171 psi | 87% | 2530 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 51,764 psi | 85% | 2592 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 98% | 53,359 psi | 88% | 2736 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 53,403 psi | 88% | 2592 fps | 99.5% |
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% | 31,792 psi | 52% | 2205 fps | 97.2% |
| Accurate 4350 | <<locked>> | 80% | 43,192 psi | 71% | 2438 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 43,453 psi | 71% | 2526 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 51,779 psi | 85% | 2507 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 36,230 psi | 59% | 2326 fps | 96% |
| ADI AR 2213 | <<locked>> | 86% | 39,523 psi | 65% | 2425 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 94% | 37,811 psi | 62% | 2385 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 92% | 31,531 psi | 52% | 2290 fps | 96.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 36,564 psi | 60% | 2329 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,756 psi | 69% | 2448 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,124 psi | 79% | 2552 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 36,245 psi | 60% | 2323 fps | 96.1% |
| Alliant Reloder-22 | <<locked>> | 82% | 34,272 psi | 56% | 2320 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,719 psi | 50% | 2234 fps | 99.6% |
| Alliant Reloder-25 | <<locked>> | 80% | 26,760 psi | 44% | 2149 fps | 95.5% |
| Alliant Reloder-26 | 74.3 gr | 80% | 33,315 psi | 55% | 2356 fps | 99% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 50,850 psi | 83% | 2562 fps | 95.6% |
| Bofors RP15 | <<locked>> | 84% | 34,084 psi | 56% | 2313 fps | 95.2% |
| Bofors RP30 | <<locked>> | 92% | 36,158 psi | 59% | 2395 fps | 95.4% |
| Bofors RP5 | <<locked>> | 82% | 34,272 psi | 56% | 2320 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 46,369 psi | 76% | 2441 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 90% | 36,187 psi | 59% | 2352 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 45,121 psi | 74% | 2484 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 47,790 psi | 78% | 2497 fps | 99% |
| Hodgdon H4831 | <<locked>> | 84% | 39,450 psi | 65% | 2375 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 86% | 41,495 psi | 68% | 2415 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,175 psi | 64% | 2339 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 33,997 psi | 56% | 2382 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 44,411 psi | 73% | 2507 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,615 psi | 45% | 1434 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,945 psi | 69% | 2382 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,993 psi | 79% | 2470 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 41,176 psi | 68% | 2388 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 38,740 psi | 64% | 2326 fps | 95% |
| IMR 7828 SSC | 74.6 gr | 86% | 37,884 psi | 62% | 2402 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 45,295 psi | 74% | 2421 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 43,497 psi | 71% | 2411 fps | 99.3% |
| Lovex S071 | <<locked>> | 80% | 27,224 psi | 45% | 2093 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 41,698 psi | 68% | 2415 fps | 97.5% |
| Norma 217 | <<locked>> | 96% | 31,720 psi | 52% | 2326 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 33,315 psi | 55% | 2326 fps | 96.7% |
| Norma URP | <<locked>> | 80% | 42,612 psi | 70% | 2428 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 37,434 psi | 61% | 2405 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 41,437 psi | 68% | 2425 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 86% | 33,127 psi | 54% | 2293 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,108 psi | 46% | 1470 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,184 psi | 84% | 2592 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,149 psi | 71% | 2457 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,553 psi | 68% | 2474 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 30,792 psi | 51% | 2300 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 42,540 psi | 70% | 2556 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 50,183 psi | 82% | 2490 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 37,637 psi | 62% | 2310 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 80% | 35,462 psi | 58% | 2306 fps | 96% |
| Rottweil R 907 | <<locked>> | 80% | 46,369 psi | 76% | 2441 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,295 psi | 74% | 2421 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 43,497 psi | 71% | 2411 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,778 psi | 83% | 2385 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,222 psi | 73% | 2372 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 35,143 psi | 58% | 2303 fps | 95.9% |
| Somchem S355 | <<locked>> | 80% | 50,285 psi | 83% | 2490 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 40,785 psi | 67% | 2349 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 39,421 psi | 65% | 2388 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,868 psi | 59% | 2290 fps | 97% |
| Vihtavuori N150 | <<locked>> | 80% | 48,022 psi | 79% | 2421 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,135 psi | 72% | 2425 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 33,185 psi | 54% | 2228 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 43,453 psi | 71% | 2428 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 34,360 psi | 56% | 2300 fps | 99.5% |
| Vihtavuori N560 | <<locked>> | 84% | 38,769 psi | 64% | 2428 fps | 95% |
| Vihtavuori N565 | <<locked>> | 90% | 38,377 psi | 63% | 2415 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 98% | 44,135 psi | 72% | 2569 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,047 psi | 71% | 2388 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,310 psi | 74% | 2490 fps | 99.4% |
| Winchester StaBALL HD | 71.3 gr | 80% | 27,035 psi | 44% | 2241 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 35,041 psi | 58% | 2274 fps | 95.6% |
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 | 260gr | Peregrine Glider GRM. Winchester StaBALL HD 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 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 60–90 %, leaving at least 10 % headroom. The 260.0 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 2225, Alliant Reloder-25 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. Alliant Reloder-26, Winchester StaBALL HD, IMR 7828 SSC rank at the top here: for .338 Lapua Mag. with the .338 | 260gr | Peregrine Glider GRM 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.