I located a photo of one of my targets cut from the big piece of poster board. Shot with an unmentionable peep-sighted small bore at 100 yards while braced against a column. I stopped at three shots so as not to ruin the group. LOL.
Seriously, that high one was the first shot from the bore, so to me it means that I do not worry too much about dispersion of the first shot from clean bore....unless the target is a squirrel's head.
In this case the black lines are 1-1/4" wide, so this group is a little over 1-1/4". I usually use 1" lines, but either looks about the same at that distance.
This was a peep sight with bead front.
Hope this helps. God Bless, Marc