Shortbow rapid. Anything else is asking the guys with scims to own you. Accurate will increase your max hit by 1 at best. But you're now only firing 2/3 as fast or so, and you do that much less damage, and the other guy owns you. Accurate shortbow and scim aren't much different speed-wise, and you should know scim hits higher (assuming he kept 40 atk) at the same cmb.