as long as the ferrule is bigger diameter than the arrow, you're fine... only way you would want to remedy that is if it was the opposite (shaft or collar or insert bigger than ferrule) that would hinder penetration.... as it is, you are good to go, since you won't be shooting broadheads at a bag target (only downside of shooting a shaft smaller than the point with a steep transition)Anyone using sevr’s or other broad heads that maybe overlap their 5mm arrow...do you use any kind of collar to make them flush or does it not matter with flight or penetration?