Geez, that's the deal of the year.
Clean that puppy up load it with target ammo and have fun.
A quick google will give you lots of information on the 1903.
It's a variation on the Mauser, the USA had to pay royalties to Mauser till WWI.
I'm pretty sure it is the longest serving firearm in US military history.
It is the basis of the Winchester Model 54 and later Model 70.