I've shot them all!! 3-4", 4-4", 3-5", 4-5", 3-5.5", and 4-5.5", shoot I bird hunt with 6-5.5" bannana cut! When it comes down to bowhunting and thats what I do it is the 4-5" or 3-5.5" hands down. With adding more feather you tend to make the arrow more forgiving to shoot. When your cold, or twisted out of possition, and you don't get off the string as smooth as you like, more fether will stabelize the arrow faster. In perfect conditions the 4" works great but add in the conditions surounding bowhunting and I'll take to more forgiving set up every time!!