A companions wounded mule deer buck back in the pre LRF days;and by the time I spotted him I had to take what I got,which was him quartering steeply away,and from the image through the 4X scope I figured him at about 500 yards.
I held for that, hit where I wanted to..
We got him.
Another pronghorn at about 400 yards;and a pair of bull elk at about 450-475 or so.
That's as far as it goes for me.