How many pumps for horizontal scope zeroing?

I recently missed two chipmunks and after checking the zero on my scope, found that I was hitting about 1" right at 20 feet.

The noise from 8 pumps might annoy my neighbors, but I want to at least push the pellets hard enough to get an accurate zero (horizontally).

Would 3 or 4 pumps in my 392 be enough to get an accurate horizontal zero?
 
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I recently missed two chipmunks and after checking the zero on my scope, found that I was hitting about 1" right at 20 feet.

The noise from 8 pumps might annoy my neighbors, but I want to at least push the pellets hard enough to get an accurate zero (horizontally).

Would 3 or 4 pumps in my 392 be enough to get an accurate horizontal zero?
Mine is a Sheridan and I don't experience windage changes from plinking to full hunting loads.
20230614_214826.jpg

It only has elevation changes with different power settings.

20230613_212848.jpg

This was zeroed for four strokes at thirty yards. The flyer is an accidental five stroke shot that gave me one inch elevation at thirty.

1972 Sheridan Bluestreak, JSB 13.73, scope is an Aim Sports, 6X24X50.
Screenshot_20250703_072523_Gallery.jpg
 
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I recently missed two chipmunks and after checking the zero on my scope, found that I was hitting about 1" right at 20 feet.

The noise from 8 pumps might annoy my neighbors, but I want to at least push the pellets hard enough to get an accurate zero (horizontally).

Would 3 or 4 pumps in my 392 be enough to get an accurate horizontal zero?
I pump and zero how I will hunt. My 392 at 10 pumps isn't 700 fps. I don't even know how slow it is with less pumps as it's too lethargic at full tilt for me.
 
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