Q:

Up Close and Deadly and Full-Attack Actions

Do you need to spend 1 grit point for each attack made as part of a full-attack action when using the Pistolero Deed up Close and Deadly? 
The Deed says:

Up Close and Deadly (Ex): At 1st level, when the pistolero hits a target with a one-handed firearm that is not making a scatter shot, she can spend 1 grit point to deal 1d6 points of extra damage on a hit.  If she misses with the attack, she grazes the target, dealing half the extra damage anyway.  This is precision damage and is not multiplied if the attack is a critical hit.  This precision damage increases to 2d6 at 5th level, to 3d6 at 10th level, to 4d6 at 15th level, and to 5d6 at 20th level.  This precision damage stacks with sneak attack and other forms of precision damage. 

Emphasis mine.   The wording of the deed seems to indicate that you need to do this for each attack, but that seems a little unfair - a single full-attack would require you to empty your grit pool if you have low wisdom.   Would the extra precision damage apply to each attack made as part of the action, or only the first attack, if I spent one grit point? 

A:

As written, you’re right: extra damage only to that attack.  Spend more Grit to apply it to more attacks. 
Now, Pathfinder firearms are extremely weak, and the gunslinger class only partially remedies their many failings.  You could make a very good case that a bit more damage isn’t unreasonable, particularly considering just how precious Grit is.  I would recommend talking to your DM about it; may he’ll houserule it.  But unless he does, it’s just the one attack.