I myself always did like the idea of having "iron-sights" on my hunting rifle! Yes, you can have iron sights installed on a model 77 Ruger. The sights will cost you around the $100 dollar plus area and the labor should be around another $100 bucks.
This is one reason I always purchased Winchester model 70 rifles, they came with all the Bells & Whistles from the factory installed already. I don't think their new rifles have those irons on them either.
I thought the Ruger Hawk-Eye rifle did have the iron sights?
Manufactorer's have gotten away from the iron sights, to many nowdays try to sell you the rifle scope, rings and mounts instead. I have always like the .338 Win mag and I purchased my son one 10 years ago. He really likes his .338 Win mag!