Quick question regarding combat with my Musket Master. Assuming it's possible to combine combat feats with grit feats in the same attack action (if not, then every GM has been wrong on this and my question invalid), what would happen if I were to combine my 7th-level grit feat Dead Shot with Rapid Shot? Dead Shot being a full-round attack action, where I make one shot but roll my d20s as though I were making a normal full-round and adding an additional damage dice per hit. Crits are confirmed using my highest BAB -5. However, because it is a full-round attack action, I can use Rapid Shot in combination. How would this work, and what would the damage be on critical hits?