... 300 yards is my absolute maximum range for shooting big game ...
Similar for me, and that's why I often don't even load my 308's wide open.
So if you see the buck of a lifetime at 315 yards on the last day of the season with fading light and no way to close in, do you walk away?
My similar meant similar range. If I can hold steady then at 315 he's going to catch a well placed bullet. But at 415 he's safe from me because I don't get to shoot enough at such distances to be comfortable. I may be able to train up to it, but right now IMO I have no business taking shots that are routine for you Pat.