For what you're thinking of as modern combat, bolt action like the Mosin is next to useless.
But in that scenario, one guy acting alone is next to useless too.
Many maneuvers require a lot of bodies shooting a lot of rounds at where the bad guys are believed to be hiding. This works best if a couple of your bodies are using belt fed MG's. Then while almost everyone is shooting at the bad guys and keeping them from firing effectively or getting away, a couple somebodies move around and shoot them.
The Mosin is next to useless for that because of its low rate of fire. Even if you were the genetic clone of Simo Haya and you pumped yourself up on speed so that you could somehow shoot it fast enough, good luck reloading with any kind of speed. Yes, theoretically you could use stripper clips to reload, but I've never seen a stripper for a Mosin that worked like it should have.
And if you're one guy alone, it mostly doesn't matter what weapon you have unless you could wipe out all of the enemy before they even know you're there. And you can't count on that happening often enough to keep you alive.
For modern combat to work, you need lots of guys with lots of ammo.
But if you just need a functional rifle for a scenario where maybe you need to place a couple well aimed shots at something maybe 250 yards or so away, just about any old milsurp is great for that.
If that is your intended purpose and you really like the Mosin, check on a Finn M-39. Or add about $100 and get one of the Savage package deals.
If all you can afford is $80...
Well, the Mosin is archaic. But they are durable, they generally work, they're usually somewhat accurate, and they beat a sharp stick.