Heh, but with 63% more muzzle energy than .338 LM ... well, I don't have to tell you this, but for the larger audience we're talking about a heavier weapon and more recoil, a lot more muzzle blast (more likely to be observed by the enemy), the rounds are heavier and bigger (pxlpshr has a point about the impracticability), etc. etc. Snipers have used it mostly because it was available, not because it was well suited for the purpose. And of course sometimes they're called upon to ... discretely destroy material.

They haven't caught on yet, but Barrett and others have been working on cartridges with 400 instead of 600 grain bullets and noticeably less energy: http://en.wikipedia.org/wiki/.416_Barrett#Muzzle_velocity