Surplus ammo is ammo that was manufactured for a military, but was eventually not needed, and so sold to the private sector.
depends on the use. Hunting? paper or home protection? Federal Winchester or Remington make ammo for this. There are surplus ammo you can find at a lower price them commercial hunting or match ammo. Make sure the surplus ammo does not have corrosive primers.
Civilian Marksmanship program, gun shows, gun shops.
Depends on the ammo. For some of the military surplus calibers, it may be an on-line dealer. For everyday civilian calibers, one of the stores like Wal-Mart with a sporting goods department.
None. Just the 7.65x53. Some surplus ammo is still on the market (although it can be difficult to find), and there's also ammo being manufactured commercially by Norma and Privi Partisan (the Privi Partisan ammo might also be sold under the Wolf Gold name).
The one that I go to has general army surplus like clothing and boots. They also have a large selection of airsoft guns. They also have survival and camping-type gear.
No Ammunition made in the US for the M-1 carbine was never corrosive, since the gas piston is NOT meant to be disassembled by the user- which corrosive ammo would require. Some Chinese ammo was made in M-1 carbine with fake headstamps that was VERY corrosive.
In the US, military surplus 7.62x54R ammo (used in the M/N rifles) is about as cheap a centerfire cartridge a you will find. However, for a FIRST rifle, I would suggest a .22 LR for anyone.
gun shops, gun shows, want ads
If you mean CARTRIDGES for a .303 Enfield rifle, also known as .303 British, depends on which cartridge, and where you are. In Virginia in the US, civilian hunting ammo may retail for $35/ 20 rounds. Careful shopping for surplus ammo may be less.
As long as you like. Storing ammo at room temperature isn't going to be the issue - humidity is going to be a much more worrisome factor than the 74 degree temperature. To avoid problems associated with humidity, store ammo in a military style ammunition (ammo) can with desiccant inside. Desiccant can be purchased at many hardware and sporting goods stores. Ammo cans can be purchased at most military surplus stores or at many gun shows.
surplus
With civiian ammo, it is the caliber. Military ammo- year made, and where