That was meant to be a rhetorical question in context with the premise of the post. I didn't intend or expect guesses of actual figures of percentages and only meant to convey that when you introduce a new element to the bullseye discipline that promises to improve scores, most shooters will adopt it (glass) and abandon the original standard (irons). At Camp Perry over the past few years, my unofficial observations tell me that not much more than 5 % of shooters (including myself!) still use open sights, mostly older shooters with no real hope of winning a trophy at this stage in their (our) lives.
As evidenced in my earlier post in this thread, my real point in obliquely addressing the op's query was that if the rules are changed and the shooter is permitted to use two hands in bullseye competition, believe me, most shooters, certainly those with any real expectation of winning something, will be holding their scope equipped pistols with both mitts. Not everybody, mind you: I'll still be shooting with these aging eyes, squinting over iron sights and holding my Smith Model 42 or Smith Model 52 or Colt Gold Cup with one shaky hand.
Of course, I've never really cottoned to the Designated Hitter rule...
