Simple RAW thread for 3.5 #31. By now, your question has probably been answered.

[Andezzar]

Are you sure? Even if the defender has the Throw Anything feat?

Reardless, what if it was a javelin and the attacker was a Master Thrower with the Deadeye Shot trick?

If ammunition hits it is destroyed, if it does not hit there is a 50% chance it is destroyed. Deflect/snatch arrows only works on attacks that hit.

A master thrower throwing the javelin back, would get the increased multiplier. but not the increased threat range from the deepwood sniper. That bonus only applies to attacks with arrows made by the deepwood sniper.