No such thing.
That is an extremely vague question. Probably referring to a gun chambered for a .30 caliber bullet which could be .30-06, .308, .300 mag, ect. Most likely bolt action of some sorth, with a 1000 rounds of ammo. My guess would be .30-06 or .308, both very popular NATO rounds.
100-1000 USD or more depending on specifics
100-1000+ depending on specifics
$1200Kplus tax. The ammo is going to cost $400/1000 rounds. in 2012
No, the term "click" in map reading typically refers to moving one milliradian, which may not directly translate to the adjustment on a sniper rifle scope. The distance of 1000 yards on a map would generally be greater than one click adjustment on a sniper rifle scope, which typically adjusts for a much smaller increment, such as 1/4 MOA or 1/10 mil.
Assuming you are not shooting ammo with corrosive primers, a rifle should be cleaned prior to prolonged storage, or when accuracy or reliability drops off. Most modern rifles are cleaned too much, which can wear the rifling. A .22 rimfire probably needs cleaning after 1000 rounds. A centerfire rifle, 500 rounds.
1000
953 rounds up to 1000
1000
1000
To the nearest 1000 it is 500.
That's like asking "how much does a car cost?". A sniper rifle is simply any rifle used for the purpose of sniping, whether it's manufactured as a dedicated sniper rifle or not. To buy one, someone might spend anywhere from $50 to several thousands of Dollars.