@almightysundaas You can but it's not particularly PP efficient to do that because it requires another action in order to capitalize on. If you think having to rolling shoot 4-5 times to get all your pp back is damage efficient, you'd be wrong. Ranger is a PP intensive class, and unfortunately if it's a boss that's not easily target-able by a trap, you are going to run into PP issues even when in properly affixed gear (currently).
Easy example: Magatsu, if you're speed running by hitting chest only, placing a trap on his platform then detonating it only restores around 40~ pp while on other bosses or while fighting multiple enemies it's easy to refill your entire bar.
100% Slave Rifle is the best choice, especially considering your point about rolling shoot, because it makes every rolling shot more effective at restoring PP so you have to do less of them to get back to using Positron or Satellite Cannon.