Disadvantages of using center fire scope on air rifle?

Of course depends if you want to use it on a Springer or gas ram gun if it is not Springer rated and on how high of a magnification if you plan on shooting airgun distances. Not so much if you are using a say 3-9x though and negligible if using a 1.5-4x. Other disadvantages are blurry sight picture and headaches. YO!
 
To specifically answer your question about the parallax issue, I would not use a fixed 100yd parallax scope on an air rifle because most air rifle shooting (in general) is at a much closer distance. The focus and added difficulty of parallax being off in what is usually precision shots would be made more difficult than needed. Money better spent on a tool for the job. Scopes like that are not meant for precision close up work.

That being said, I would say a majority of scopes used on air rifles were not necessarily made for air rifles, but they have specs that the user needs.
 
Accuracy is relative to the user. For the most precision I'd say no the riflescope described isn't ideal and not suited to general airgun use. That being said I had 4x and 3-9 centerfire scopes on my 22's as a kid, approx 47-ish years ago, and killed tons of little critters inside 100Y.

It would help precision if you had a good cheek weld on the stock so you are always looking down the center of the scope.

It's kinda funny this subject came up right now because just yesterday we had a fly hatch and they were everywhere. We poured beer on a metal table, the flies liked beer a lot apparently, must of been very thirsty, so we all commenced into population control mode, lol!!! My friend didn't have his AG with him but had his 22rf with an old Leupold 2-7x32 on it. He didn't have any problems making flies disappear at 10Y with this rig. That being said it was easier for me to do the same with my 6 fpe Steyr LGB1 biathlon trainer with an Athlon Talos BTR 4-14x44 on top which focuses below 10Y on 10x. It was so much fun being able to, wing shoot, head shoot, cut in half, or center up for a pile drive on those flies, lol! Because I have .2 mil hashes in that scope, and plainly saw the tiniest detail with clarity of focus, I could place a pellet exactly where I wanted to! .9 mil holdover would cut a wing off with the bottom of the pellet, and .5 holdover would obliterate. PRECISION in action 😁!!!!




 
It's kind of hard to divide scopes in "airgun scopes" and "centerfire scopes." 😊

I really depends on the features and the shooter if they are usable for airguns (AG) or only for powder burners (PB).

After comparing the specs of over 150 scopes last year I find that manufacturers mix and match all kinds of features with each other, so the lines are blurred....



I wrote a separate post to answer this question, here:

https://www.airgunnation.com/topic/choosing-an-airgun-scope-vs-powder-burner-scope-%f0%9f%a4%94-whats-the-difference/




Hope this helps some! 😊 


Matthias


 
The scope I mentioned can be had for sub $270-ish on sale at various dealers. Mil reticle with mil turrets, compact, lightweight, good glass, "great reticle that was done correctly", the best I've seen for the $.

What you want to get is moa Turrets and moa Reticle combined, or mil T and mil R. It's not ideal to get moa T and mil R.

If you anticipate being on low magnification most of the time get a SFP scope, if mid to higher magnification a FFP is a great idea. 

The Athlon Talos SFP 4-16x40 on my varmint rifle is a highly underrated scope! Yesterday I was hitting a 18" steel plate at 675Y with a 20-221FB centerfire with 4.5 mils holdover on 10x where the mils are correct! Really impressed with it for a $169 MAP scope!!!