i dont think its really that easy to scare off a mature buck from your hunting ground....i do believe that it IS easy to make them mostly nocturnal.

i relation to a few of the other posts, a couple years ago i shot a nice 135" buck with my muzzleloader, and then about 10 minutes later from the same spot another nice 3.5 yr old walks out like nothing ever happened....the shot did not bother it at all.
I have also rattled in a buck and shot it with my shotgun and then just for fun after i shot i rattled in another buck to 10 yards! he was a small one but still the shot did not bother him