I have only tried to stop one buck with a "blat" or "murp" (actually I think it was a "baat"). He came running in after a doe, and I had to "baat" twice, but I'm not sure if it was that that stopped him or the fence he was gonna have to cross. The doe didn't stop for the fence, just flew over it. The buck stopped about 10' from the fence, as I "baat"ed, then slowly walked toward it. Since he was only 15 yds away, I didn't give another "baat". Just took the shot as he walked into it. I shot another buck the same way...was just walking at a normal pace by my blind. Got my last buck as he was trotting by my blind, although he did slow down a bit before he got to me. These two were also at 15 yds, so I didn't want to spook them with a "baat". Just like the first, let them walk into the shot and let the arrow fly. All ended with lung shots, basically where I put the pin. I suppose if they were farther away, the shots may have been a little farther back. I have also tried shots at deer looking at me, after trying to stop them or they spotted me, with the only successful hits being at 15 yds or closer.