In Dead Island Riptide, two new rifle types of firearms have been introduced: bolt-action and semi-auto sniper rifles.
Bolt-action sniper rifles can only be shot once before requiring another reload. It seems that on average, their accuracy, reload speed, and damage are lower than semi-automatic sniper rifles.
Semi-automatic sniper rifles hold about 5 ammo per magazine. Both seem to deal extra damage on head-shots.
Is there any reason to use a bolt-action sniper rifle over a semi-automatic sniper rifle?