6.5 x 55 with some 129 Hornady SSTs.
Circular pattern starting at upper right and going counter clockwise. If I make the bullseye big enough I can get a few in the yellow. .
I have nothing to back this up but read once the eyes will naturally center on a circle, that a larger peep sight was just as accurate as a smaller one. For me it's a matter of poor eyesight and being better able to see the crosshairs with a larger bull.
I've tried smaller bulls without improving the groups so just accept my limitations and happy just to get something decent.
I have my rifles sighted so the shoot 2" high at 100yds so I really never see the group as I shoot it
and have a clean sighting point for each shot that way it doesn't mess with my head as I shoot and can hold on hair out to 200yds and not worry about hold over.