Scope loses zero

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Walt there are a lot of different right answers to that question.
First it depends on the type of scope.
Some scopes the cross hairs themselves move while others have etched round glass mounted so the turrets adjust the whole thing up-down left-right and prism
Other factors can be a torqued or bent tube that could be caused from dropping the gun or putting something heavy on the scope.
Mounts can also be the cause, loose bent or broken or mismatched (which can cause the above torqued or bent tube)
Stripped turret locks or threads
Sorry for the wide vague answer but I hope it helps
As to being fixed again it depends on the scope the issue and it's value. At one point we actually used a hair from my mother to replace a broken cross hair one problem though is that we couldnt vacuum the tube and seal it again so it would fog up easy
 
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I can't argue with that Willie ... historically !

Those basic factors (presented by Willie) do exist but usually the problem is poorly mounted elements within the scope. By 'elements' I mean lenses.

If no changes have been made (magnification/ocular focus) then the most likely culprit will be the Reticle system (which usually uses a suspension system governed by small springs).

If a scope has been used with the reticle 'maxed out' on one axis (or another, possibly both!) then the system has a limited lifespan - that is the simple answer to the question ...

"Do I need to optically center my scope"?
 
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Most scopes are not vacuumed but rather just purged with N2 to displace any air / moisture and then sealed with a mainly dry N2 "blanket" in the scope.

Most low cost scopes also are not worth repairing and if they are worth it they usually carry a manufacturers warranty which will cover the scope if it begins to shift POI.

Thurmond
 
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Yes, and as Nitrogen is heavier than 'Air' it's really just a matter of pouring in the Nitro :) then closing. (I'm not kidding - pour in the Nitro and the air is expelled)

Some recent scopes have a very evident gas purge plug (usually on the saddle), no doubt these plugs/ports make the whole proccess more cost effective.
 
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I knew I shouldn't have but thought I would give this $60 scope a try...... I put a tasco varmint 2.5-10 x 42 on my Beeman R9 and the dang thing lasted about 300 shots. It no longer holds zero, reticles migrate lower and lower with each shot. Turrets no longer correct 1/4" MOA at 100yds but probably closer to 1/16". Don't know if I'm stating that correctly but basically I have to turn 4 times as many clicks to get the same adjustments I did when the scope was new...... is this to be expected with scopes in this price range or did I get a lemon? I thought the Varmint was airgun rated when I bought it but apparently not. Its a shame I cannot use my R9 without investing in a $300 scope, which just isn't in the budget right now.....
 
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You don't have to spend 300$ to use the gun . There are guys who Love their UTG , center point , and BSA scopes .
AJshoots told me he has a real scope killer rifle and the BSA scopes have never failed !
My advice would be go to Walmart an look at the center point scopes and just keep the packaging and receipt . My shooting buddy has several hard kicking springers who all wear center points !!
There's a BSA I think it's called a sweet 16 or something like that I saw that had some pretty decent optics . And crosshair wasn't too heavy like some
http://www.pyramydair.com/s/a/BSA_3_12x44_Rifle_Scope_Duplex_Reticle_1_4_MOA_1_Tube/959
I'm not 100% positive..By I'm pretty sure this is the one my buddy has ... it's a very nice scope for the $
 
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Thanks for the link Joe. Years ago I had a BSA contender on the R9 which lasted about 6 month. The turrets no longer adjusted correctly so I put a 4x Redfield on it which has lasted years. Recently I wanted to upgrade to a mil dot with higher magnification so I gave the Tasco a try. Hope I can get something to work for me, the R9 is a great rifle, accurate, and build quality second to none.
 
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The Contenders aren't airgun rated to my knowledge. The actual BSA Airgun scopes are the only BSA'S I ever used on a springer. My old 2-7 lasted almost 10 years on my BSA SS. It never broke, I just replaced it as the front lense got cracked, but that is a whole different story.

I have a number of old and new Contenders but they are on powder burners and pcp's.
 
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