The .338 Lapua Magnum Ackley Improved (.338 LM AI) is a custom wildcat cartridge designed to increase the powder capacity of the standard .338 Lapua Magnum by blowing out the sidewalls and steepening the shoulder to 40 degrees. As a custom chambering, specific dimensions can vary based on the reamer used, but it generally operates at higher pressures than standard factory ammo to achieve improved velocity.
Suitable Powders
Bullet Weight (gr) -> | 0-50 | 50-75 | 75-100 | 100-150 | 150-200 | 200-300 | >300 |
|---|---|---|---|---|---|---|---|
👍 ... suitable powder
👍👍 ... suitable AND popular powder among our reloading community (clasification might evolve as more community members share their loads )
Caliber Specifications
Standard / Datasheet
Primer Size
Large Rifle Magnum (LRM)
Case Capacity
124.89 Grains of Water
Bullet / Barrel Diameter
0.338'' | 8.59 mm
Max. Case Length
2.724'' | 69.19 mm
Max. Cartridge Length
3.975'' | 100.97 mm
Max. Standardized Pressure:
69618 psi | 4800 bar
XXL ID
CID_452
.338 Lapua Mag. Ackley Improved load data is available with the following bullets:
(most popular first)
