your distance from barrel to center of scope is all the lower a round should hit close
lower your scope is mounted the less that is
for me it is about 2 inches on most things I have the 2-7x32 scopes on so I keep the 25/50 yard zero and on close stuff set the cross hair on the top of the head it will be between the top of the head and the middle of the head depending on exact distance.
Definity worth playing with the numbers
https://www.hornady.com/4dofthe calculator will give you the low or high based on your zero , the ammo , the height over bore of your optic you can change your output to every 3 yards and you can adjust your zero distance by yard
play the numbers out in the calculator find where you can make your max range shot and the close 10-30 foot shot 3-10 yards
I run a 2 inch height over bore on my 10/22 zero for 25 yards
here is a chart from the calculator
graph paper with a 1/4 inch grid makes a good target color 4 squares black with a pen or marker now you have a half by half inch aiming point , sight in , then work forward and back from minimum distance to maximum distance you want to know for , confirming the data from the chart you decide on
you can even make a quick reference with a stripe of tape on the stock Make a red line and zero distance then blue, at common distances like
3, yards 7 yards , 10 yards , 15 yards ,
25 yards(zero) , 65, 75 and 100.
are you going to look at it while a coon is rushing you , no but there is time while you sit often enough that you look at it and it is a regular reminder of distance and drop a "dope chart" on center fire rifles we normally start at 100 or 200 and go out to 3-400 yards maybe further , but rimfire close is very possible and useful.
I call it a 25/50 because 2 tenths of an inch is not a big deal to me at 50 yards it is a bullet width
this setup works because a close 10 yards 30 feet squirrel lay the cross hairs on the top of head and you are in the head
a farther squirrel you are a bullet width up or down form 21-51 yards probably one of the most common distances for small game
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