In '03 '04 '05 I shot 3 cases each year. The gophers were out of control here and strychenine was not yet approved for use, so the only effective method was to shoot them.
After '05 I didn't pick up a 22 for 5 years- Just kinda grew tired of shooting them.
So I would guess somewhere south of 300,000 rounds, if I include the 10,000 or so rounds I would have shot between 11-21 years of age, and the 5000 or so since 2010.
I should clarify those were cases of 60 boxes of 525 federal bulk packs, so about 30000 rounds per case(or would that be called a crate?). Each of those years the local CO-OP would have a big sale in early april, I think at that time they were around $750.00 per case on sale. My dad and father-in-law bought most of the ammo I shot.