As mentioned i wouldnt highlight the fact i was shooting however in this day and age you cant do right for doing wrong.
Just out of interest and not stirring but could you/would you get in trouble for leaving the rifle unattended when you went to speak to the Officer? I m sure it was in a safe place/ locked away / kept with a buddy. im just thinking that the officer might then say ' well wheres your rifle, where have you left it etc etc' , espically if the officer isnt savvy with airgun/firearm legislation
rgds
craig