I never said it was impossible to do so but why would you? If you have a bolt action sniper rifle, have high ground, good cover and the enemy dont know your position I, as a sniper, would never go full ape-shit spraying with my sniper rifle just because I can. One shot, one kill, nice and clean. If I start spraying and praying as a sniper with a bolt action rifle Im not doing what I was trained to do.This is a ten-second combat round.Those are often bolt action or semi automatic and the ammo dice pool from ROF just doesnt make sense. Even an assault rifle have the possibility to fire just one round and should there for be able to do so.
In ten seconds it's not that challenging to fire multiple rounds from a bolt-action rifle. Remember also that this is *combat* and your primary consideration ought to be keeping yourself alive by killing the enemy. If you miss on the first shot you are not going to wait 10 seconds and hope you get another. Saving a round for the next opportunity is a false economy when people are trying to kill you.
The assumption built into the to-hit roll is that you will take n shots to hit, and that's what the ammo die is for. For reasons I outlined above, the option to take a single shot ought to be accompanied by a -1 to hit modifier.
Right now there are no rules to cover this kind of combat.
Futher, it is not a false economy - if Im out of ammo, i cant shoot back, I need to make every bullet count and as a sniper that is making every shot count as I said. One shot one kill.
As a sniper I will only take a shot if Im sure I will hit, not "hum i probably need 5 bullets here and hopefully I'll hit with at least one... here goes nothing", giving my position away and an empty clip.
It is more likely that you take the 10 secs and aim and hit with one shot than spending 5 and hope one will.
Just to be clear, Im not against the rules of ROF and ammo spend when it comes to heavy weapon, assault rifle and sub machineguns. I like the idea but the rules needs to cover the possibility for characters to choose to fire single rounds.