I've been shooting them since the spring and have really liked them. My 400s weigh 9.9g/inch for a total hunting arrow weight of 420ish with 100 grain head. They fletch nicely and pull real easy from 3Ds and fly extremely well. You will forsure notice more penetration in your practice targets, which should carry over to animals. I have noticed a sight bit of bend on some of the practice arrows now. I will be watching that carefully. I cannot wait to see what they do to a deer - should pack a devestating (?sp) punch. Bart