Scope recommendation for .25 Benjamin Marauder

Athlon Talos BTR 4-14x44 FFP

optisan EVX 4-16x44

both good scopes nice reticle and both are Side adjustable parallax from 10yards 

Bigger mag in that price is 

Athlon Argos 6-24x50 

Also, take a look at the weights and scope lenghts. You might find that a higher mag is both shorter and lighter. Although, at short distances low mag works better. IMO.

Take a look at the SWFA SS Classic fixed power scopes for $299.95. They have a fixed 6X and a fixed 10X in either MOA or Mil-Quad reticles with the corresponding click adjustments. They're durable and the turrets track true.

Check out the Discovery line of scopes. They have a lot of different features, and the glass & reticles have received some really good reviews. I just ordered one yesterday. Check them out at Airgun Optics Plus, Charlie has great reviews as a vendor. For your needs, I'd suggest a 3-9, 4-12, or 4-16 power scope. My needs are similar to yours; I went with a $120 4-16 power VT-2 scope so I have higher magnification when I need it for field hunting. But all of their scopes fall right in your price range.

https://airgunopticsplus.com/collections/scopes

The disvovery vt-3 3-12x44 ffp compact is def one to check out. Focus down to 15 yrds, side focus, excellent glass for the price, and has the wonderful mil-quad reticle thats the same as the swfa one. I got mine direct from discovery through amazon prime for 165 shipped, couldnt be happier!

If you are truly going to be shooting mostly 15 yards or less, than I would suggest getting a red dot optic. I have one on my .25 bullpup and have no problem hitting a 2" spinner at 65 yards. Up close, they really rule! Obviously, I am talking about pesting and not paper punching.

get the discovery you wont regret it its got class like a 800 scope no joking 

Discovery has one problem

is look cheap and funny 

Hawke Airmax, for springers. They stand by their warranty. Other lower priced brands are a risk.

https://us.hawkeoptics.com/airmax-riflescopes.html

Nikon ProStaff 3-9 EFR or Bushnell Banner AO 3-9...

rightnow my 25 Mrod wears the Nikon

15 yards??? fixed 4x scope. At the close ranges, lower magnification definitely the way to go. Anything over 4X will just not work well, and I suspect taking time to zoom in and out isn't really needed at 15 yards. If you want a variable, find a 2 - 7 or something in the low magnification range. My old (and I mean old) Redfield Widefield 1.5 to 4 would be perfect at 15 yards.

3-9 would be an excellent magnification range for 15 yard hunting. You'll probably spend most of your time at 3x because it's sufficient. On the reviews, take a look at the reasons the reviewers are unhappy. Were they expecting too much, did Nikon not honor the warranty? Were they valid reasons to not like the scope. I find many reviewers are just not realistic in their expectations. If you find their reasoning valid for you, look elsewhere. I'm a Nikon fan from way back, still shooting Nikon cameras after over 45 years, but if they've cheaped out, go elsewhere. Also, what site are you reading. Amazon still has 4.5 stars, and some of the low ratings were for things outside of Nikon's control, like one guy got the wrong scope from the vendor. 

I would avoid the BDC reticles. Those are designed for specific powder loads and just don't work well for air rifles. (In my opinion)

Another pet peeve of mine (it's not a requirement, but bugs me half to death) is when the reticle is Mil-Dot and the turrets are MOA. If you plan on using turrets to adjust for range, get MOA reticle with an MOA turret. At 15 yards this shouldn't be a problem as once set, you'll probably leave it alone, but I'm a touch OCD and it drives me crazy.

good luck on your selection. Can't really go wrong with a decent 3-9 at the range you shoot at.