How many pumps for horizontal scope zeroing?

[Don.Chipmunk-slayer]

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?

 

[JEFFPPC]

One way to find out, try it. Four pumps will affect your vertical zero also.

 

[Don.Chipmunk-slayer]

One way to find out, try it. Four pumps will affect your vertical zero also.

Not worried about the vertical zero, it's on at 30 feet, just the horizontal right now.

I'm going to breakfast with a bunch of other old, retired guys, but once I've finished ... it's shootin' time

 

[JEFFPPC]

You missed my point. Lower power and you will most likely lower POI.

 

[Squack]

Scope quality and ring height are critical points at extreme close range.

 

[.20calguy]

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.

It only has elevation changes with different power settings.

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.

 

[Don.Chipmunk-slayer]

You missed my point. Lower power and you will most likely lower POI.

No, I got it. I know the vertical will be off with lower pumps, I'm more concerned with horizontal at the moment.

 

[6gun]

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.

 

[6gun]

You missed my point. Lower power and you will most likely lower POI.

Windage too sometimes.

 

[Don.Chipmunk-slayer]

Windage too sometimes.

My plan is to use 3-4 pumps to check the windage, then a few full power shots to verify

 

[jarmstrong]

when my zero starts shifting around,,, I need to clean the barrel

 

[.20calguy]

My plan is to use 3-4 pumps to check the windage, then a few full power shots to verify

If you find windage changes at different velocities you may also want to check different ranges as well for instability/spiraling issues.

 

[TimeRabbit]

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?

1 inch right at 20 feet or 20 yards?

Anyway if your zero is at 30y and your checking it a different distance 20 feet and your significanty right or left of your zero I would think the scope is not aligned to the bore.

Something like this

 

[Don.Chipmunk-slayer]

1 inch right at 20 feet or 20 yards?

Feet

 

[TimeRabbit]

Feet

OK I have edited my post with a diagram.

 

[TimeRabbit]

Do some testing shoot a card at your zero then shoot two more one at +10 and one at -10 keep the number of pumps the same you should then have a better idea of whats going on.

That is a unique scope mount situation for that rifle I see a couple areas that could possibly be adjusted to bring your scope and barrel into better parallel alignment . One area I would look at is the clamp to the barrel and the other is the riser there are three bolts you may just need to play with the pattern when tightening them down .

I did see a good writeup here on agn to check scope to barrel alignment that involves a plumb level line on the wall , bubble levels making sure the scope and rifle are level and a flashlight shinned through the scope and barrel checking to see if the bore and reticle are on the plumb line ( reticle must be optically center for this). I am sure some one on here can explain it better than that or knows where that post is but I have reached my descriptive limits.

I am writing this as a fellow chipmunk slayer. Give-m-hell Don.

 

[Don.Chipmunk-slayer]

I currently have a Baker scope mount, although there's a really good chance that I'll be sending the gun to Mac1 for a FULL steroid setup. I'm tossing a coin now on whether or not to have him install his scope mount as well.