Shag, after seeing an older gentleman getting 1" group with his 45-70 using iron peep sight at 200yds while I was shooting really sporatic at 60yds, I went and got a Williams peep.
I kept the original Knight front green fiber optic and mounted the Williams.
The store in Puyallup told me to sight it in at 25yds at 2" high and it should be dead on at 100yds.
He also told me to remove the aperature and just use the ring from the sight after sighting in at 25yds.
I really can't explain it but I was able to shoot pretty tight groups at 100yd and more using 348gn Powerbelt.
Could be a confident thing too, I don't know.