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I bought a .22 LR revolver recently and the gap seems excessive to my eye. I haven't tried a feeler gage yet but it looks like .010".
Isn't that a lot of wasted energy blowing by?
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Don't sweat things too much about cylinder gap.
Like John points out - - it just ain't that big of a deal.
Instead, be thankful you won't be tieing up the cylinder with build up.
.22 ammo can be some of the nasty- filthiest stuff you can shoot.
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For typical revolver barrel lengths, a change of 0.005" of barrel/cylinder gap changes the velocity by 20-25fps in a .38spl.
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Although I have no hard data to support my feelings - - only prior ownership of a Dan Wesson .22 - on which I did several experiments with B/C gap...
I'd have to say the change is not even that dramatic & I've seen a lot of data on line from other shooters that show that much & nearly ten times that much change - in shot to shot comparison - from the same revolver using the same loads & having the same B/C gap.
Edit to add - - of course, that's assuming the gun you just bought is used & it's something you really wanted and/or is special.
If the gun is new - or it's still under warranty - that gap is on the wide side, I'd send it back under warranty and have it adjusted.