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
No
$1200Kplus tax. The ammo is going to cost $400/1000 rounds. in 2012
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
1000
953 rounds up to 1000
1000
1000
To the nearest 1000 it is 500.