Wildcat chrono question

5 month old Wildcat 22
​shooting 15.89 JSB
​I get 72 shots easily and 96 before it falls off regulator!
I chronoed 48 shots
Low 1st shot 828 Hi 876 on 36th and 48th shot
spread of 48
​max deviation 36th shot 876 37th shot 859 = 17
does this seem correct?
​I shoot dot on and then there comes a wayward round?
​Learned and educated opinions and suggestions welcome?
​Thanks, in advance!