Load Specifications
Load data in caliber .338 ARC with .338 | 200gr | Woodleigh FN SN bullet and 19 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 36, IMR 4227 and ADI AR 2207.
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: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 5744 | <<locked>> | 82% | 44,425 psi | 85% | 1837 fps | 96.2% |
| Accurate No. 11 FS | <<locked>> | 86% | 45,716 psi | 88% | 1850 fps | 99.2% |
| ADI AR 2205 | <<locked>> | 88% | 44,657 psi | 86% | 1775 fps | 99.8% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 38,783 psi | 75% | 1847 fps | 98% |
| Hodgdon LilGun | <<locked>> | 82% | 45,730 psi | 88% | 1880 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 27,717 psi | 53% | 1106 fps | 100% |
| IMR 4227 | <<locked>> | 96% | 45,223 psi | 87% | 1847 fps | 98% |
| Lovex D060 | <<locked>> | 88% | 44,962 psi | 86% | 1844 fps | 96.3% |
| Lovex D063 | <<locked>> | 86% | 46,905 psi | 90% | 1867 fps | 96.8% |
| Lovex S040 | <<locked>> | 82% | 46,644 psi | 90% | 1785 fps | 100% |
| Lovex S053 | <<locked>> | 98% | 45,295 psi | 87% | 1854 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 27,267 psi | 52% | 1135 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 98% | 46,021 psi | 89% | 1893 fps | 98% |
| Shooters World Blackout | <<locked>> | 86% | 46,905 psi | 90% | 1867 fps | 96.8% |
| Shooters World Buffalo Rifle | <<locked>> | 88% | 44,962 psi | 86% | 1844 fps | 96.3% |
| Shooters World SOCOM | <<locked>> | 88% | 44,744 psi | 86% | 1831 fps | 96.9% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 44,628 psi | 86% | 1759 fps | 100% |
| Vihtavuori N110 | <<locked>> | 92% | 46,021 psi | 89% | 1818 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 39,320 psi | 76% | 1827 fps | 99% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 5744 | <<locked>> | 80% | 42,192 psi | 81% | 1808 fps | 95.6% |
| Accurate No. 11 FS | <<locked>> | 80% | 37,565 psi | 72% | 1742 fps | 97.8% |
| ADI AR 2205 | <<locked>> | 80% | 35,346 psi | 68% | 1650 fps | 98.8% |
| ADI AR 2207 | 20.5 gr | 92% | 30,661 psi | 59% | 1713 fps | 95.5% |
| Hodgdon LilGun | <<locked>> | 80% | 42,815 psi | 82% | 1847 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,218 psi | 39% | 984 fps | 100% |
| IMR 4227 | 18.8 gr | 86% | 34,142 psi | 66% | 1686 fps | 95.2% |
| Lovex D060 | <<locked>> | 84% | 40,103 psi | 77% | 1775 fps | 95% |
| Lovex D063 | <<locked>> | 82% | 41,133 psi | 79% | 1791 fps | 95.5% |
| Lovex S040 | <<locked>> | 80% | 44,106 psi | 85% | 1759 fps | 100% |
| Lovex S053 | <<locked>> | 80% | 27,412 psi | 53% | 1581 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 19,638 psi | 38% | 1007 fps | 100% |
| ReloadSwiss RS 36 | 20.4 gr | 88% | 34,113 psi | 66% | 1726 fps | 95% |
| Shooters World Blackout | <<locked>> | 82% | 41,133 psi | 79% | 1791 fps | 95.5% |
| Shooters World Buffalo Rifle | <<locked>> | 84% | 40,103 psi | 77% | 1775 fps | 95% |
| Shooters World SOCOM | <<locked>> | 84% | 39,276 psi | 76% | 1759 fps | 95.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 26,121 psi | 50% | 1503 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 32,358 psi | 62% | 1640 fps | 100% |
| Vihtavuori N120 | <<locked>> | 86% | 26,397 psi | 51% | 1604 fps | 95% |
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 19 powders for .338 ARC loaded with the .338 | 200gr | Woodleigh FN SN. ReloadSwiss RS 36 delivers the highest muzzle velocity at 1,893 fps; across all powders the maximum-charge window runs from 1,106 fps to 1,893 fps. ADI AR 2207 gives the best case fill at 100 %, and 19 of the 19 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (359 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.338" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. ADI AR 2207, Hodgdon TrailBoss, ReloadSwiss RS 14 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. ReloadSwiss RS 36, IMR 4227, ADI AR 2207 rank at the top here: for .338 ARC with the .338 | 200gr | Woodleigh FN SN they combine a high case fill with complete burn and sit in the upper velocity band. Hodgdon TrailBoss, ReloadSwiss RS 14 stay subsonic at start load. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.