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 Post subject: scope wont hold zero
PostPosted: Thu Sep 21, 2017 7:18 am 
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Joined: Thu Feb 16, 2017 12:14 pm
Posts: 8
I have a Crosman optimus 495 with the center point 4x32 non ao adjastable scope. I shoot 20 yards every time i shoot, and the scope wont hold a zero. for example, I zeroed the scope one day and shot the next day, and it was off. the scope rings are tight, I rest the rifle in my hand, and let it recoil where it wants, and I shoot when there is no wind. I'm thinking its either parallax, since there is no adjustment, and the facotry set the scope for 15 yards, even though i try to hold my head in the same place every time. or, the scope cant handle the recoil of the springer, and something internally is shifting throwing it off. even though it is meant for springers. what do you guys think?

Thank you


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 Post subject: Re: scope wont hold zero
PostPosted: Thu Sep 21, 2017 9:43 am 
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Joined: Sun Mar 24, 2013 1:56 pm
Posts: 225
Location: Lebanon, CT
A factory setting of 15 yards doesn't sound right, but you can easily set the parallax yourself by loosening the locking ring of the objective lens and turning the lens itself. To set to a closer distance turn the lens CCW. Look through the scope when pointed at a target at the distance you'll be shooting and move your head up and down, side to side, and when the crosshairs don't move with the motion, but stay on target, the focus/parallax is set. RC


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 Post subject: Re: scope wont hold zero
PostPosted: Thu Sep 21, 2017 9:46 am 
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Joined: Mon Aug 08, 2016 7:23 am
Posts: 2839
Location: Somewheres near the Atlantic
Its parallax to 50 Y, Not 15.


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 Post subject: Re: scope wont hold zero
PostPosted: Thu Sep 21, 2017 11:53 am 
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Joined: Tue Aug 19, 2014 5:47 am
Posts: 30
Have you adjusted the ocular on the scope so that it doesn't move around when you do a head bop? If you've done this correctly then the cross hairs won't move depending on where your head is at.


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 Post subject: Re: scope wont hold zero
PostPosted: Thu Sep 21, 2017 1:13 pm 
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Joined: Wed Jan 05, 2011 12:35 pm
Posts: 6089
Location: P.G. B.C.
Springers wreck cheap scopes.

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Daryl


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 Post subject: Re: scope wont hold zero
PostPosted: Tue Sep 26, 2017 7:12 am 
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Joined: Thu Feb 16, 2017 12:14 pm
Posts: 8
leadslinger wrote:
Its parallax to 50 Y, Not 15.


i looked in the Manuel this morning, and it is 15yds


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 Post subject: Re: scope wont hold zero
PostPosted: Tue Sep 26, 2017 10:13 am 
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Joined: Mon Aug 08, 2016 7:23 am
Posts: 2839
Location: Somewheres near the Atlantic
j stones wrote:
leadslinger wrote:
Its parallax to 50 Y, Not 15.


i looked in the Manuel this morning, and it is 15yds


Well online I gotten 30- 50 Y. I gotten manuals for complete different scopes than the one I bought.


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 Post subject: Re: scope wont hold zero
PostPosted: Tue Sep 26, 2017 10:19 am 
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Joined: Sat Nov 05, 2016 10:52 am
Posts: 2988
Location: Caronport, Saskatchewan
Did you get the factory to set it for you to 15 yards?

Sent from my SM-G930W8 using Tapatalk

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 Post subject: Re: scope wont hold zero
PostPosted: Tue Sep 26, 2017 11:26 am 
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Joined: Wed Sep 07, 2016 11:04 am
Posts: 781
wesb2007 wrote:
Did you get the factory to set it for you to 15 yards?

Sent from my SM-G930W8 using Tapatalk


He stated the value was retrieved from his manual. For the OP, what model is the scope? I get 30 yards in all the sources I have found so far. Still looking though.

btw, my understanding is you are better off tossing the centerpoint and buying decent glass.

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 Post subject: Re: scope wont hold zero
PostPosted: Tue Sep 26, 2017 11:40 am 
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Joined: Mon Mar 27, 2017 7:06 pm
Posts: 854
Location: Meaford, Ont.
Check trigger screw that fastens stock onto gun and the screws that hold the stock on. Scope shifts that is normally what it is for me. Now I blue Loctite every screw after I remove them.


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 Post subject: Re: scope wont hold zero
PostPosted: Tue Sep 26, 2017 12:49 pm 
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Joined: Wed Jan 05, 2011 12:35 pm
Posts: 6089
Location: P.G. B.C.
wheeliehd wrote:
Check trigger screw that fastens stock onto gun and the screws that hold the stock on. Scope shifts that is normally what it is for me. Now I blue Loctite every screw after I remove them.


Same here - all screws on springers (HW's) are lock-tighted. I believe it is likely foolish not to do this. The BAM 28C I had for a while, would loosen tightened screws in 4 shots. THAT was a kicker/vibrator. I gave it to a friend who thought he 'needed' a magnum springer. BTW - tightening the screws with lock-tight stopped the screw loosening, but did not make it shoot any better. LOL

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 Post subject: Re: scope wont hold zero
PostPosted: Tue Sep 26, 2017 1:20 pm 
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Joined: Mon Mar 27, 2017 7:06 pm
Posts: 854
Location: Meaford, Ont.
Daryl wrote:
wheeliehd wrote:
Check trigger screw that fastens stock onto gun and the screws that hold the stock on. Scope shifts that is normally what it is for me. Now I blue Loctite every screw after I remove them.


Same here - all screws on springers (HW's) are lock-tighted. I believe it is likely foolish not to do this. The BAM 28C I had for a while, would loosen tightened screws in 4 shots. THAT was a kicker/vibrator. I gave it to a friend who thought he 'needed' a magnum springer. BTW - tightening the screws with lock-tight stopped the screw loosening, but did not make it shoot any better. LOL


I have a Ruger Airhawk (full power spring) and screws would loosen in a few shots and I was zeroing my scope everyday and shooting erratic. Thought I was having scope trouble. Stock screw on bottom was loose and scope would jump when fired. Loctite on three stock bolts tight and the rifle shoots quieter now and sounds more solid. Learned my lesson. LOL


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 Post subject: Re: scope wont hold zero
PostPosted: Tue Sep 26, 2017 7:33 pm 
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Joined: Sun Mar 24, 2013 5:51 am
Posts: 226
Location: Richmond, BC
The problem is its a center point scope.... These are the cheapest and crappiest scopes on the market.... Although its included with a springer it is not made for a springer.... I used a buddies once on my qb57 and after a couple of shots the crosshairs turned diagonal....


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 Post subject: Re: scope wont hold zero
PostPosted: Tue Sep 26, 2017 8:35 pm 
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Joined: Mon Mar 27, 2017 7:06 pm
Posts: 854
Location: Meaford, Ont.
trickster2000 wrote:
The problem is its a center point scope.... These are the cheapest and crappiest scopes on the market.... Although its included with a springer it is not made for a springer.... I used a buddies once on my qb57 and after a couple of shots the crosshairs turned diagonal....

With all due respect:
I totally disagree with you. I shot my Ruger Airhawk scope for months on it. Then beefed it up to a full power spring and shot it. I still run one on a Crosman 495FPS spring gun with a Centre point. It is still going strong and have shot it a lot. I have shot a lot before I switch to Leapers scopes. (Three Leapers scope) I think Centerpoint scope are very good for a cheap scope. My Ruger scope is pretty much a centre point and have shot it a lot to without problems on different air rifles. We will wait till he checks his screws and see. :lol:


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 Post subject: Re: scope wont hold zero
PostPosted: Sat Sep 30, 2017 5:50 pm 
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Joined: Sat Jan 25, 2014 9:16 pm
Posts: 1278
Location: United States
Usually the parallax is set to 100' for airguns, but it makes sense that a 500 model would be less. Now my question is did they actually set it less, or better q is did they bother to set it at all? My guess is they're slapped together and all they do is count the turns on the threads when installing the front lens. I seriously doubt they spend the time to physically look and adjust to whatever claimed distance.
Another biggie imo barrel droop which means the scope and poi are not lined up and you had to turn your elevation screw way out to compensate. Sometimes the spring inside can't hold the guts under that firing cycle, and sometimes the spring doesn't even go that far so the guts are just flopping around.
It's ideal if the screws are at the midway point for both image quality and better spring tension. So I'd shim the scope and see if that helps. Generally I center the inner tube by looking down the front lens with a flashlight, then shim the scope until it's fairly close to on target or you're hitting a bit high, then use the adj screws to dial it in.
Could also be the gun is simply spraying pellets. They are low end and can have serious accuracy issues. How does it shoot with open sights? Don't rest the gun on anything firm or hard btw, best if it only touches you.
If you haven't heard of shimming a scope there should be info here or online, or I can send it to you; chevota at hotmail, and what I'll send includes lots of other helpful stuff for that gun.


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