Rifle Scopes Which S&B ultra short and why

520 unless you need the fov at 3x.

520 is quite a bit shorter glass is a wash to my eyes

520 might pose issues depending on what mount you want to use although that's a mute point with the new 520 coming out

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I was recently pondering the exact same thing.

Hopefully I can add a little bit to this conversation with a couple quick question. How do the ultra shorts compare optically to the PM II 5-25's? I asked this because I have an older full-sized 3-20 PM II that seems a lot more forgiving and optically better than my 5-25.

Also, am I correct that there is no tunneling in the ultra shorts like the 5-25's?

CM
 
I was recently pondering the exact same thing.

Hopefully I can add a little bit to this conversation with a couple quick question. How do the ultra shorts compare optically to the PM II 5-25's? I asked this because I have an older full-sized 3-20 PM II that seems a lot more forgiving and optically better than my 5-25.

Also, am I correct that there is no tunneling in the ultra shorts like the 5-25's?

CM

First the glass isn't as good in the US as the 525 imo. The 320 is slightly better image quality than the 520.

Both the 520 and 320 do not tunnel.

The eye box is actually better on the 520 and 320 vs my 525s I have owned.
 
I own a 3-20 US, along with the older 3-20 PMii's, and 5-25x56's. I have looked through the 5-20 US, and my opinion is unless you need a very compact scope (where mounting options would be more difficult), I would just go with the 3-20 US. If the tunneling issue below 8X doesn't bother you, then the 5-25 would have the better light gathering at lower light conditions, and lower cost generally.
 
I asked this because I have an older full-sized 3-20 PM II that seems a lot more forgiving and optically better than my 5-25.
I’ve had all three, regular 3-20x50 (non US), 5-20 US and 3-20 US. I’ve seen the S&B 5-25 but never owned one so cannot comment. But between these three the non- ultra short had the best glass/experience then the 5-20 and then the 3-20 US. That’s not to say the 3-20 US was bad but their was a difference in IQ above 15x where the 5-20 I owned had better IQ. The 5-20 doesn’t get as much love because the 3-20 offers more magnification range, but FOV in 5-20 is huge and IQ solid throughout the range - impressive for how short this scope is.
Also, am I correct that there is no tunneling in the ultra shorts like the 5-25's?
Correct, the ultra shorts have no perceptible tunneling that I could see.
The 320 is slightly better image quality than the 520.
I had the opposite experience, sample variance possibly.
I did love the dtii+ turrets
The DT II+ are Schmidt’s best turrets IMO. The low profile 18 mrad DT turrets of the original ultra shorts are their worst turrets, when they offered the DT II+ in the ultra short they became much more relevant for me.