You can make additional attacks of opportunity.
Benefit: You may make a number of additional attacks of opportunity per round equal to your Dexterity bonus. With this feat, you may also make attacks of opportunity while flat-footed.
Normal: A character without this feat can make only one attack of opportunity per round and can't make attacks of opportunity while flat-footed.
Special: The Combat Reflexes feat does not allow a rogue to use her opportunist ability more than once per round.
Can a character with Snap Shot and Combat Reflexes make multiple attacks of opportunity with a ranged weapon, assuming that loading the ranged weapon is a free action?
Yes. As long as you can reload your weapon with a free action you can reload your weapon as part of the ranged attack attack of opportunity you are making with the Snap Shot feat.
Pathfinder RPG Core Rulebook. Copyright 2009, Paizo Publishing, LLC; Author: Jason Bulmahn, based on material by Jonathan Tweet, Monte Cook, and Skip Williams.