I did'nt try it yet but the idea of the nerf was to compensate it with the rapid reloader buff (chance to restore ap) and the shooting spree feat which is really good (you have to wait until lvl 10 for it though).
FYI :
Shooting Spree :
Grants you an ability that when activated will cause your next sniper rifle attack to refund 100% of its action point cost if it kills the target. this will expire at the end of the turn if unused.
Cooldown: 10 turns
Also, killing a target with a sniper rifle reduces the cooldown of Shooting Spree and Aimed Shot by 1 turn.
Requirements
Guns 55
Feat: Aimed Shot
Also you can (or should i say must) invest specialisation points in it for 1 additionnal free shot and up to 4 turns of cooldown reduction.
With limited temporal increment (which seems necessary for this build), it should be pretty strong