Putting the targets out can help in relation to the ground and known ranges.
Always visually guestimate the target range before getting ready for the shot, usually not far out under 47 yards. Pretty easy at sub 40 yards anyone should be able to visually guess within 2 yards.
If the kill sizes were all the same, to a degree bracketing works. May be more the case of instinct or quick judgement through the scope, again something that would have to be learned. You also get to know what the target size looks like in relation to ret at various ranges and probably better than full on bracketing, acts as a double check.