Well... according to your above statement, you offered it to him first. Naturally, he's going to say 'yes'. As a gun guy myself, hell - I'd like to check out your "piece" too.
I'm also trying to imagine what you are carrying, given your description of the number of rounds and how the slide action works. The officer may not have been familiar with your particular sidearm or the function thereof (obviously). But to be fair - a police academy does not make you an amory specialist. I'm sure he's familiar with how his gun functions.... doesn't mean he knows 'em all.
You do know that in Virginia, you do not have to "claim" your sidearm when approached by LE - right? I'm sure the officer appreciated you being open about it, but don't bring it up unless you have to. Overall, I'd say your encounter was positive, based on your above statement.