3-5" MOA is still on target. The shots in this game at distance is like a 1-5ft spread.
I have all said ammo in my possession and I shoot regularly at my local range. The spread isn't that wide in real life, you will still hit the target with steel case Tula / Lake City garbage.
The issue with this game is that skill can't tighten the grouping, the cone is the cone, the player can't overcome it.
That's easily a 1-2" grouping in real life at that distance using any ammo.
Snipers are not affected by weapon bloom.
But you can find one weapon that's not affected by bloom, like the PP29:
Yeah it is all about being approximate. BF4 nailed it. You could kill people from a good distance. They weren't as accurate as real weapons, but stuff is a lot smaller on screen due to FOV and other restrictions (100 meters in games looksmore like 250 meters in the real world). So real world ballistics weren't 100% accurate, but it approximated and scaled with the "in game visual range". A 5.56 carbine would easily get kills at 80-100 in game meters, which would be around 200-250 in the real world.
Example, skip to 7 minutes here:
I had zero problem firing a quick burst and killing someone when they looked fairly small on screen.