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GP100 Shooting High Despite Sight Adjustment

This is a discussion on GP100 Shooting High Despite Sight Adjustment within the Ruger Double Action forums, part of the Pistol & Revolver Forum category; My GP100 shoots about a foot high at around 10 yards. I took the sights off late last year to sandblast the polished finish away, ...


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Old March 7th, 2017, 04:45 PM   #1
 
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GP100 Shooting High Despite Sight Adjustment

My GP100 shoots about a foot high at around 10 yards. I took the sights off late last year to sandblast the polished finish away, put them back on and it hasn't been the same since. I have lowered the rear sight all the way down and it doesn't seem to make any difference. I was using a 6 o clock hold the last time to compensate but lost interest because I'm having to hold beneath a 12x18 target to hit center mass. I used to be able to shoot fist sized groups off hand at 25 yards with this gun. I shot both 38 and 357 magnum the last time I took it to the range, gave up after less than 20 shots and put it away. I haven't changed ammunition, the sights are the same as what was installed previously. Any ideas?



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Old March 7th, 2017, 04:56 PM   #2
 
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Quote:
Originally Posted by Misery357 View Post
My GP100 shoots about a foot high at around 10 yards. I took the sights off late last year to sandblast the polished finish away, put them back on and it hasn't been the same since. I have lowered the rear sight all the way down and it doesn't seem to make any difference. I was using a 6 o clock hold the last time to compensate but lost interest because I'm having to hold beneath a 12x18 target to hit center mass. I used to be able to shoot fist sized groups off hand at 25 yards with this gun. I shot both 38 and 357 magnum the last time I took it to the range, gave up after less than 20 shots and put it away. I haven't changed ammunition, the sights are the same as what was installed previously. Any ideas?
Would you not raise the rear sight if it shoots high?
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Old March 7th, 2017, 05:34 PM   #3
 
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Would you not raise the rear sight if it shoots high?
Check that, I confused myself! You're right.

Not sure what would be going on. Something had to happen when you took those sights off.
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Old March 7th, 2017, 09:36 PM   #4
 
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Both my GP100's tell me in the manual to "lollipop" the sights. That is, to aim at the 6 o'clock position on the target. If I held dead center, it would shoot high. I changed both out to Williams Fire Sights, and adjusted them for POA to be POI at dead center.
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Old March 7th, 2017, 10:05 PM   #5
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The rear sight must move in the same direction as you want the bullet to move so if the gun is shooting right, you move the sight left. If it is shooting high, you move the sight down.
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Old March 8th, 2017, 04:50 AM   #6
 
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Old March 8th, 2017, 05:31 AM   #7
 
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I would re-check the mounting and make sure there is no obstructions in the slots/screws for adjusting.

When you adjusted the rear sight all the way down did it make any difference?


Sight images:

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Old March 8th, 2017, 06:01 AM   #8
 
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Try reinstalling the rear sight again. It seems to me there may be an obstruction under it. Maybe one of the two tiny springs got pinched or bent?

Last edited by Tater; March 8th, 2017 at 06:05 AM.
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Old March 8th, 2017, 08:19 AM   #9
 
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Try reinstalling the rear sight again. It seems to me there may be an obstruction under it. Maybe one of the two tiny springs got pinched or bent?
Yes. I had it happen to me, but caught it right after I did it.
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Old March 10th, 2017, 05:27 PM   #10
 
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I'll take the rear sight off and check it again. I had it all the way down when I went out last time and it didn't help.
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Old March 10th, 2017, 05:41 PM   #11
 
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I'm kind of confused by this one. The OP has twice stated that adjusting the rear sight didn't help or made no difference. That just isn't possible if the sight is free to move up and down. Is the POI moving up and down but just never getting low enough to hit center? Is the sight bound up where it can't move? If you loosen the rear screw to raise the sight, then push down on the sight do you see it move down to touch the frame under pressure? Is there any possibility a shorter front sight got re-installed after the finish change? Does the gun behave the same in the hands of another shooter? There is something going on here that just doesn't make sense...
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Old March 10th, 2017, 05:59 PM   #12
 
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Would you not raise the rear sight if it shoots high?
Nope, just the opposite. Think about it a bit longer
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Old March 10th, 2017, 06:11 PM   #13
 
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Quote:
Originally Posted by Misery357 View Post
My GP100 shoots about a foot high at around 10 yards. I took the sights off late last year to sandblast the polished finish away, put them back on and it hasn't been the same since. I have lowered the rear sight all the way down and it doesn't seem to make any difference. I was using a 6 o clock hold the last time to compensate but lost interest because I'm having to hold beneath a 12x18 target to hit center mass. I used to be able to shoot fist sized groups off hand at 25 yards with this gun. I shot both 38 and 357 magnum the last time I took it to the range, gave up after less than 20 shots and put it away. I haven't changed ammunition, the sights are the same as what was installed previously. Any ideas?
If you removed the front sight and sandblasted you may have taken too much off thus lowering the front sight height causing your high hits. If you haven't found any grit under your rear sight and the spring is functioning then you could get a Dawson sight since they make the front sight at different heights. Why would sandblast in the first place to dull Rugers nice finish? You could have bought a Taurus with their dull matte finish.
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Old March 10th, 2017, 07:01 PM   #14
 
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Originally Posted by eagle7840 View Post
Nope, just the opposite. Think about it a bit longer
Yes! Corrected right away! Confused myself!
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