I hear alot of guys talk about having to sight their rifle back in every year.I am not talking about shooting it to make sure it is still on, but actually having to adjust the scope every year. Why is that so ? I sighted in the gun I most often use 10 years ago when I bought it, and have not had to touch it since. All my rifles have been like that, even my muzzle loader which is when the first inline night came out, how ever long ago that was lol.. I have taken my rifle several times out of state by truck, and even on a airplane and nothing has happened to change it. The strap broke on me in South Dakota while stalking and it fell over 15 feet down a steep bank. Seen guys with alot more high dollar class scopes having this trouble.Is it because they can't shoot or what. Just always wondered why this is ?