Thats hard for me because I am familiar with the Mauser, Nagant, & Enfield. But if I had to use it as a battle rifle I would have to go with the Enfield.
The bolt is very slick, and it has the largest capacity. Depending on what kind of Enfield it can also have really good sights. (or cruddy sights on some models).
I would take the Mauser second. Very slick, very accurate. Easy to shoot well.
Third would be the Springfield. Very similar to the Mauser, very hard to pick between the two.
Fourth would be the Nagant. As much fun as they are to shoot, they have the hardest bolt throw, and the most difficult to operate safety. Super accurate though.