i call that lollipoping the target - putting the blade at the bottom of the circle, like a lollipop stick. works well when shooting at black circle targets.
for service shooting i use a rear peep. it takes a bit of getting used to, and some faith, but can work surprisingly well, even at extended distances.
for CQB matches etc, you can use the larger aperture, or on the skinners simply remove the insert. almost no focus required on the front blade. just line up and shoot.
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