I prefer the Eagle model as well.
FWIW, a lot of guys have mentioned that the Blackhawk "Hawk-Tex" cheekpad is a little "sticky" and not as comfy to shoot for long periods of time.
Wildcat, the shell loops will take .300WinMag, but they're tight enough - you'll be pushing it to get your .408s into it. The good news is that is really isn't that practical to carry ammo there anyway, especially long ammo.