I've tried several ways to write this reply, without sounding impolite or harsh, but I've failed miserably.
So I decided to go with....
Logical Argument:
You have an un-shrinkable object measured with Teutonic precision to be exactly 62mm. And you have a choice of two moderately expandable (but non-shrinkable) items to choose from.
One is 61.7mm, and 0.3mm Smaller than the object to be fit.
The other one is 62.5mm and 0.5mm Bigger than the object to be fit.
Now which number is bigger than the other number???
Since the bigger one @ 62.5mm is larger, if you bought that one, it would fall right off (62.5mm > 62.0mm), so to get it to fit you would need to wrap .04 cents worth of tape around your $3000.00 + scope in order to get your $8.00 scope cover to stay the frig on it.
OR alternatively you could buy the one that's 0.3mm smaller (61.7mm < 62.0mm), and then you might could stretch it over the end of the objective, where it will then fit super tight, and not easily fall the frig off.
Hypothetical Argument:
Maybe the guy that posted a #47 scope cover for your scope, actually: Please select only one
a) Posted an innocent typo
b) likes to have his BC's covers taped on instead of fitting
c) was actually drunk when he made the posting
d) all of the above
Reductio ad absurdum Argument:Mile High is in the business of selling $3000.+ scopes and then pissing off their customer base by selling them $8.00 scope covers that won't/don't fit. That's why they told you they don't even stock a #47 scope cover.....