no matter how tuned you are a broahead and filed tip WILL NOT fly the same. may group or hit where you want but watch some slow motion of the flight its erattic the vanes are always fighting against the blades. slim designed mechnicals are the only thing close to a field tip and be careful because some of the mechnicals are so fat or have so much sticking out of them you might as well shoot fixed. ive shot more deer then i can remeber with mechniacals and ive yet to loose a deer or have a head not open on impact. putting the arrow where it should be is more valuable then anything else because really if you put a field tip in the vitals of a deer it would die. theres nothing like the peace of mind knowing its gonna hit where you aim. my last 15 deer i can remeber i only tracked 3 and they went less then 100yds and thats with only a 1.25" cut no need for the big ones but if you tend to make bad shots (my brother is notorious for shooting too far back) the bigger cut head will help out.