Straight up,no,a .260 Remington cartridge is not appropriate for a Zastava mini-mauser.
What a 7.62 x 39 Mini Mauser would be a natural for is a 6.5 Grendel.That would be the same caliber,different cartridge.
The 6.5 Grendel is derived from a necked down 7.62x39 case.
That would make a great mid range deer rifle.
If you are going to use a surplus 98 action...at least think about the 6.5 x 55.
It will be a little easier to build. Classic Mauser derived cases are a little easier to get to feed right.Lothar Walther,among others,can sell you a nice short or long chambered threaded barrel.
I understand having the itch to build one from an action you have.Some things just don't have to make sense to anyone else. You have your own reasons. I get that. I've built several myself.
But it doesn't really add up,these days.Especially if you are paying someone to do the work.
The Zastava in 6.5 Grendel makes sense,IMO.
Take a look at a Ruger American,maybe. Or find any good commercial used .308 length rifle and rebarrel it.
You also might look at Howa and barreled actions from Brownells.I don't know if they are crf. The CZ's are.
Action truing,drilling and tapping,bolt handle mods, how is your bolt face,firing pin hole? The locking lugs need to bear plenty of contact,and that's not always just a little lapping. You need a scope safety.
You might want the bottom metal shaped and slimmed.
Military trigger,or?? Going to have it blued?
Stocking one is a project.
And yes,a barrel . You pay a smith for all that I suppose you could buy a nice .260. And start a pretty good scope budget.
Its been a few years back,but if I had my own milsurp action already,and bought a Douglas barrel, I did all my own work, I still spent at least $500 to build a rifle,without sights.