I have some Easton Gamegetter aluminum arrows (linked below) with a ferrule size of 21/64". I'm having trouble finding broadheads that aren't either 5/16" or 11/32". Anyone have any recommendations?
link (http://www.3riversarchery.com/Easton+Gamegetter%2526reg%253B+XX75+Aluminum+Arrows_i6777X_variablekit.html)
Get the 21/64 broadheads and you will be fine. They will overlap a small amount 1/128" on each side of your arrow.
I think he mmeant 11/32". The litle extra won't hurt a thing.