I will shoot my fixed blades before I use them. I found that some broadheads shoot perfect by alligning them (3 Blades) with feathers/vanes but another brand broadhead will not shoot the same way off my bow. So I put rubber washers on them so I can tune them to the position they shoot right. I remember when I first started bowhunting I just put them on the arrows and that was that. But I will not do that ever again. Some broadhead brands will not shoot for anything. I will not resight my bow for my broadheads like some of my friends do. (That is just my preference.) If I cannot get a broahead to shoot the same as my field points I won't use them. Muzzy's work the best for me so thats what I'll use besides some pop open broadheads. I hunt groundhogs during the summer so I tried many different fixed heads over the years including K-Mart & other cheap broadheads. Some of them work just as well as my Muzzy's. What I'm getting at is you are better off shooting them before you hunt with them. Maybe its just me but not all broadheads fly true by just lining them up with your vanes!