vernw,
Not sure if you've seen this one but here's a post from a fellow member.
https://www.longrangehunting.com/threads/2019-sask-whitetail.230289/
He got this nice looking buck with a 6.5 CM also. Sounds like it took him two shots to put this one down for the count. Not sure of the yardage or where the first bullet hit, but the second bullet was placed in the neck somewhere. It's the same bullet and bullet weight you were using.
For what it's worth, I took a buck a couple years ago with my .243 Winchester. I hit him with a 95grn Nosler partition from about 75 yards away. I hit him right behind the shoulder and the deer just stood there for a few seconds. It ran about 10 yards and then stood there again. The first shot was lethal (later determined after I gutted him) but I put a second shot on him and he then ran about 10 yards and fell over. The exit wound was minimal (about the size of large lemon) but the internals were smoked where the bullet traveled through. Meat loss was minimal also.