In order to maximize damage, you’ll want to spend your 48 points in both the Master and Hunter skill trees. They’re split almost evenly, but you’ll have a few extra points in the Hunter tree just so you can reach the end of the tree and get that gnarly permanent 20-percent crit chance passive buff.
Source: N4G PC Borderlands 3 FL4K build guide: Picking the right skills, pets, and guns