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Do feats, such as vital strike, bullseye shot, and devastating strike, stack with each other for the single ranged attack per round?
Yes.
Bullseye Shot requires you to use a move action
Devastating Strike is designed to work only with the Vital Strike chain so they stack by default.
since vital strike and devastating strike explicately work together, and bullseye is a move action, yes. They stack.
These feats in particular do stack. Others might not; read carefully.