How many rounds to do shoot a year? Dozens? Hundreds? Thousands?
mathman, I really wish I had an exact answer for you, because I would really like to know myself <and not tell my wife>.
From 1980--2005 I am safe to say more than 1000 per year and maybe more. I can tell you a couple of stories about where I lived in 2 diff places and shot behind my house. I was privileged to have good backstops for testing, graphing, etc. w/o having to leave the house.
I am sincerely trying to be honest in my answer. I also know that with as much shooting as I have done w/variable scopes, I would have EXPECTED to have some failures.
Jerry