Duplicate Projectile

(This spell is a re-purposed version of the spell Duplicate Arrow originally submitted by DeskFishingCorps to account for other types of projectile ammo such as bullets.) 

As a bonus action, you can cast this spell on a non-magical projectile.  When this projectile is fired, it magically duplicates and creates a second projectile.  The duplicate projectile can only attack the same target.  You must roll a ranged attack for both projectiles using your normal attack and damage modifiers.  This spell stacks with Hunter's Mark i.e. you get Hunter's Mark damage, if active, on both successful hits.