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 Post subject: shifting zero
PostPosted: Thu Apr 18, 2013 7:10 pm 
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Joined: Fri Jun 01, 2007 11:36 am
Posts: 2220
Location: Nova Scotia, near Halifax
just got a used phantom.
i can dial it in so it shoots pretty good. with a scope
then put it down come back and p.o.i. has shifted about a inch or so at ~20 feet
dail it back in and it's good
come back to it and....poi have changed again.

scope is rock tight. all screws on gun are tight so.... :? .....
what the heck is going on???

ps- the wife isn't home so i know it's not her.
the dog? maybe, but i don't think so.
maybe i just can't shoot???

i am trying to use the same hold every time. i would love to use a scope on this gun but...looks like i might not be able to.

wanted to check in with you all before i make any decisions.

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sub 500 .22 Crosman Phantom 500 open sites
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 Post subject: Re: shifting zero
PostPosted: Thu Apr 18, 2013 7:20 pm 
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Joined: Wed Jan 05, 2011 12:35 pm
Posts: 6016
Location: P.G. B.C.
Sounds like your gun shoots differently cold than warm. By the time it's sighted in, it's warm. Then you set it down and come back to it when it's cold and the POI reverts back to cold. Suggestion - experiment - use a single target for cold barrel/gun shots, then count the clicks necessary to re-sight on a different target. Set it aside, then repeat a group on the cold target and see if it's back there. Shoot it till warm and see if the group moves at all, as it heats up.

Seems the way it's going, always changing to sight it in every time, pretty soon you'll run out of adjustment- either elevation or windage

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Daryl


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 Post subject: Re: shifting zero
PostPosted: Thu Apr 18, 2013 7:26 pm 
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Joined: Thu Aug 30, 2012 10:54 pm
Posts: 277
It's probably your dog screwing with you, have you ever played Duck Hunt? Dogs love to mess with guns.

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 Post subject: Re: shifting zero
PostPosted: Thu Apr 18, 2013 7:34 pm 
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Joined: Mon Feb 11, 2013 12:46 am
Posts: 4123
is there a scope stop on the phantom ?
how many shots did you take after you dialed it in ?
and what was the grouping like ?

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 Post subject: shifting zero
PostPosted: Fri Apr 19, 2013 8:00 am 
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Joined: Thu Mar 15, 2012 6:38 pm
Posts: 1267
Location: Near London Ontario
Make sure that barrel is snug at the joint and the barrel washers aren't worn out.

I had a springer that took 3-5 shots to get going and then would be good for the day.

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 Post subject: Re: shifting zero
PostPosted: Fri Apr 19, 2013 2:38 pm 
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Joined: Fri Jun 01, 2007 11:36 am
Posts: 2220
Location: Nova Scotia, near Halifax
there is a scope stop hole.
i have a one piece mount and didn't use the scope stop hole. but i had it snugged down really tight.
the grouping after i get it dallied in again is less than half inch. with the odd flyer or pulled shot.
and that would be 15 or 20 shots after i get it dialed in

i did check the pivot and it seemed tight.
didn't check the washers.
i will though.

thanks for the help so far. i am ready to sell my scope and just keep the gun for scaring away crows and coons. and put any type of target shooting away, in fact put all my shooting aside for a new hobbies, i am getting so frustrated with spending money but not getting good repeatable accuracy.

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my other coil is a sub ohm
sub 500 .22 Crosman Phantom 500 open sites
sub 500 .177 Crosman TR77 NPS 4-16x40 UTG
sub 500 .177 Hatsan mod 33 with Quattro trigger open sites


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 Post subject: shifting zero
PostPosted: Sat Apr 20, 2013 9:21 am 
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Joined: Thu Mar 15, 2012 6:38 pm
Posts: 1267
Location: Near London Ontario
I had this exact same issue with my nitro venom. moved scope rings so ensure there was no room for the scope to move at all, used plumbers tape on the screws. Issue solved. One ragged hole now, and a ton of fun!!

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 Post subject: Re: shifting zero
PostPosted: Sun Apr 21, 2013 7:47 am 
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Joined: Mon Oct 19, 2009 1:13 pm
Posts: 3
Some of the guys on Our Chinese UK forum have had this problem,Over here the weather has been very cold for the time of year.It was Discovered that the materials expand and contract at a differing rate from one another.The scope was faster at reacting from warm to cold and guns were slower.Resulting in a loss of zero,worse when the gun was shot in the garden rather than being transported to the range.The cheaper the scope and mounts the worse the condition appears :?


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 Post subject: Re: shifting zero
PostPosted: Sun Apr 21, 2013 1:37 pm 
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Joined: Sun Jul 15, 2012 10:49 am
Posts: 6029
Location: Victoria, BC and Clarkston, WA
walrus wrote:
Some of the guys on Our Chinese UK forum have had this problem,Over here the weather has been very cold for the time of year.It was Discovered that the materials expand and contract at a differing rate from one another.The scope was faster at reacting from warm to cold and guns were slower.Resulting in a loss of zero,worse when the gun was shot in the garden rather than being transported to the range.The cheaper the scope and mounts the worse the condition appears :?


That occurred to me about different expansion rates of metals!
As a machinist I have to lets part cool for a minute or two. When trying to measure less the .0004 ovality in a part on the lathe I will run coolant on it for a minute after the machining is complete! A human hair and piece of paper are .004" in thickness!!!

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Pardini K10
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3 Custom Crosman 2260
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Crosman 150 pistol .22
4 Crosman MK 1 pistol .22
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 Post subject: Re: shifting zero
PostPosted: Mon Apr 22, 2013 1:59 pm 
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Joined: Thu Oct 11, 2012 1:58 pm
Posts: 128
Location: Cochrane Alberta
I have a similar situation occurring. But my question is, if it temp related then why does it shift high a few inches (in my case anyway). Then I re zero downward to shoot accurately. Next session the same, so I am always zeroing downward and will eventually get to a point where there are no more clicks to zero the gun?


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