No the Lapua is shortened and is not nearly the same case capisity. The .366 DGW will push a 250 grain bullet at 3253 FPS a 286 grain slug at 3125 and the 300 grain bullets at 2900 FPS. If you were to sight in a .366 DGW with the 250 grain Nosler bullet 2.4" high at 100 yards you would be right on at 275 yards and have 2733 FPS for velosity and 4146 FPE, at 500 yards you will be down 24.55" and have 2349 for velosity and 3064 for energy, this is well above the .338 Lapua.