My wife said, "rookie mistake" ... every single springer & pcp you have purchased in this hobby venture of yours. 
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whoops!I'm embarrassed to admit I overfilled my gun by accidentally watching the regulator instead of the pressure gauge. Fortunately the bottle and everything else handled it without drama. I bled out the extra and continued on with my day. It was definitely a scary moment, though!
And doing it over again, and again, and again, and..........Buying an affordable pcp because it's on a deal with no intended purpose. Than later looking for a purpose for it to fill. Than going back to my main pistol, carbine and rifle realizing they already fit the bill.