Need some weapon guidance!

Hey y’all! Enjoying the hell out of this game, but I’m having hard time like understanding exactly what weapons are what based off their names and such. I usually play a sneaky-beaky style and I’m looking for more of a DMR or sniper type weapon in the game. I’ve got the Old Earth Hunting Rifle right now, which has been fine, but it’s starting to be underpowered.

Anyone got any suggestions?

Also what’s the gnarliest gun in the game?