Because ELD-X
todbartell shot an elk in the in the shoulder one year and the bullet failed to make it to the vitals. That was a .338. 225gr ELDX IIRC.
Does that mean the 338WM is too small for elk? No, it means if you shoot enough animals, you're goona see some weird stuff.
The sheer number of different people showing strange and inconsistent results with ELD-X speaks to the BULLET not the HEADSTAMP.
230gr ELDx (2550 fps MV, impact speed was around 2350). It hit the scapula and bullet was pulled off the rib cage
Shots that hit ribs only penetrated through and through

I now use ELDx for range and hunt with 225gr Nosler Accubonds