I remember my first bear like it was yesterday. Shooting a Herter's Blacktail Hunter with a brand new invention highly rated in the writings of that awesome Chuck Adams...The Zero peep. On the range I was living large and in charge. That 1/16" peep hole was the BOMB!!! I'm 12' up in a tree and 12 yards from the bait pile in heavy timber. Bear comes in, I draw, and all I can see through that peep was black on black beside more black. Raised my index finger from below my chin to the corner of my mouth, ignored the peep and sights and drilled him through the heart.
The next day before heading out for elk and deer I took dads drill and drilled out that peep hole as large as it would go without cutting the string. I think that was just over 1/8"...probably 5/32". To this day I never go into the woods with a peep aperture less than pupil dilation. And I have never seen an ounce of difference in my accuracy between 1.5mm and 1/4" aperture holes. Only difference I've ever noticed was in the clarity of my target scopes when using the small aperture holes. Pins and target always clear and present from 5mm to 1/4" holes! Though I am sort of partial to the 3/16" & 7/32" aperture holes.
What was the OP about??
Sorry for getting off topic! I've sort of got a peep thing 