
Wonderstell |

Sniping requires a move action to enter stealth, while your standard action is used to make a ranged attack. Regardless of if you have an additional move action, the Sniping rules declare that you can only make one attack.
If you don't care about 'maintaining your obscured position', then you could full-attack and enter stealth as part of a five-foot step (or move action from Amazing Initiative).
Do keep in mind that only your first attack would benefit from being in stealth, unless you've got Signature Skill (Stealth) and 15 ranks in the skill.