Depends on year of manufacture, condition, quality of stock, but probably in the ballpark of $400-$500 for a good condition weapon.
100-1000 USD depending on condition, accessoires.
That is a Springfield rifle I believe.
Remington Firearms Company during WW2
03A3
line up the target on the top of the front sight while sighting the front sight through the rear peep sight.
Yes, so long as it isn't an m5a1 and is the 1905 model you should be fine.
If truely unfired and not an arsenal rebuild, it would probably sell for $1500.00, however if the serial number fell into the range of rifles that were designated as sniper weapons, value would exceed $7500.00
http://www.surplusrifle.com/03a3/operations.asp
50-600 or so
None of the 03A3's are antigues
Surplusrifle.com has a detailed, step by step process. Look for the links on the left side of the page under the Maintenance heading. http://www.surplusrifle.com/03a3/index.asp
To type the sigma symbol (Σ for uppercase and σ for lowercase), you can use different methods depending on your device. On Windows, you can use the Alt code by holding the Alt key and typing 228 for uppercase (Σ) or 229 for lowercase (σ) on the numeric keypad. On Mac, you can type Option + W for σ and Option + Shift + W for Σ. In many word processors, you can also insert symbols from the menu or use Unicode: U+03A3 for Σ and U+03C3 for σ.