There is no way of destinguishing the different bullets just by looking at a loaded case, with few exception.

Here is a list of the major ammo manufacturers and what their head stamps are.

Federal = - F C - for Federal Cartridge or -F C H E - for Federal Cartridge high energy.

Remington = R P for Remington Peters

Winchester = Winchester

Hornady = Hornady or Frontier

Weatherby = Weatherby