One word of caution that you must use if your are trying to find your own custom bolt/arrow. You need to find out what the minimum total arrow weight must be for your CB before you go to light. If you go to light, you may gain arrow speed but you can have a dry fire affect on your CB. You will not notice it at first, but after enough shoots, you get a big whack in the face and now you have a busted limb bow! I know Horton's minimum totalweight is 431, I think Tenpoints is 415, and on Barnett's web site they do not say the word minimum but they recommend 475 for the quad 400 and similar bows, 454 for the quad 300 and similar, and all the smaller slower bows the recommend 372, but they do not say if that is the minimum or not. Be careful and do not ruin a good bow and then turn around and say it is junk because of what you did. I also forgot about Excal's, but I do not know what there minimum is. Good luck!