Just read on Excals forum about using 18" shafts, alum inserts and 4" vanes for 330 grs w/ 100 gr b-head is giving 290 fps outta a Vixen, so ordered some for my buddies bow. Should flatten his trajectory some, which since he's too bull-headed to get a range finder, may help him this season. Are ya proud of me Jay? lol.Get a pencil thru a telephone pole yet??