I've got little experience with it, but the 155 pound whitail I punched with a 127LRX from my 6.5CM only made about 30 yds and he was damn near full run when I shot him. A sample of one, but I'm begining to think there's something to it.
I've whacked several running Montana whitetail does (approximately the same size as your buck) over the last few years with a 14 twist 223 AI firing 40 grain Ballistic Tips. They went about the same distance.
