Dan,

I have the VX III 4.5-14x40 on my 30-378 and absolutely love it. One key thing, practice practice practice. I wouldn't reccomend getting one unless you practice each and every dash in the reticle. As long as you know what the zero range is on each dash you will be a better shot. I shot a doe last week at 572 yards, one shot in the neck. The combination of my practice and that scope made it all possible. I wouldn't advise buying one and expecting it to be dead on each dash.
Photos to come later