There's a big difference between target shooting and hunting. All my shots when hunting are pretty much instinctive. I may take 6 shots in a 2 or 3 hour session.
Not sure how I'd fare taking 40 shots over an hour at knockdown targets I'm not familiar with.
I'm familiar with shape and size of my quarry but an unknown size of steel plate with an unknown size of kill area at a guestimated range would certainly make it hard for me to judge distance and place a shot accurately.
I'm aware shooters do get familiar with courses so get to know the target size and distance.
Last I heard, digital rangefinders weren't allowed in competetive shooting but are invaluable when hunting