I'm wanting to try the carbon express heritage but not for sure which size to get. I'm shooting a Viper Deluxe 57# @ my draw 28" FF string 150gr to 200gr tip wanting arrow around 29"-30" I'm guess the 250's well be right with the amount of weight up front. But I mite be wrong. The 250"s are 10gpi and with a 150gr tip and all the other things on the arrow my weight well be about 475gr I guess I would need to put weight tubes in them to get them up to 570-650gr which is where I want my finished arrow weight, or should I load the ip like some guys with 250gr-300gr up front w/head and 100gr insert? I like high FOC but I thank that loading the front with 30%+ is to much but I mite be wrong because I see alot of guys doing it. So any help would be nice,m I'm going to hit the search and see what I can come up with too, but there isn't alot about this bow and heavy arrows.