Here’s how I look at feathers, I use large Flu-flu feathers when I don’t want my arrows going too far, as in shooting flying targets and squirrels up in trees.. When I shot field or lawn archery I used 3” feathers which kept the arrow stabilized with only a field point, but when I screw a BH on the shaft I want to provide as much control as I can yet not slow the arrow down anymore than necessary. Restricting my kill yardage as I do to the range where I can assure a kill if I do my part I prefer to use a 5” feather with a hard helical when brace height allows. Sure this will slow the arrow if I were to shoot at game over extended distances but it also assures the least flight upset should I tweak the string, hit my sleeve, catch a leaf or a twig on the way to the boiler room of target.. I take every advantage I can to assure a clean kill…