MAXIMUS,
I would get the sling eyes installed. There are many times when that sling can be your friend. Much easier to do it now than add them latter.
I understand your dilemma with the ammo. I really don’t think the Hornady brass will make that big of a difference. Just a follow up on what I said before. If you go with Norma you will want to by some of the same lot as it was regulated with. Just by a little extra and go shoot some practice. Now you have some nice nickel once fired brass.
You may find the Federal will shoot to the same point of aim. You can allwas by the bullets to load your self.
Bill

@D93
You are absolutely right H&H can use what ever load the customer may wish. I think the use of a non “factory” load would make the rifle much harder to sell. One other consideration would be what happens when your rifle shows up but no ammo? Will it shoot factory loads to the same point of aim?
Until you shoot a load in a given rifle you don’t know what the velocity is going to be. This is why you must have a good chronograph to duplicate that load. The loads in the reloding books are just good guesses. There are to maney vareations in powder and rifles to garentee a given velosity for a listed load.
Bill