I went into the jacksons website, and found an arrow that fits what I am looking for. It is a carbon express 300 cx, and with the components that I selected, it will give me a finished arrow weight of 414 grains using a 125 grain broadhead, and an foc of 11.4 percent. I can lose just a few grains by using duravanes which are suppose to be a little lighter than the easton diamond vanes according to the tech info on their website, and a lighter nock will get me closer to the 400 grains I wanted and a little higher foc to boot. Is this a good shaft to use, and will 4 inch fletching control this arrow if it is fletched at 4 degrees with a 125 grain head? Also will it still be spined right for my set up with the info I provided? I have always used 100 grain muzzy's, and was wondering how the heavier 125 grain 3 blade will shoot. Thanks for the replies. Bhunter32.