Everything I have ever read from Mathews says the warranty covers 5 grains per pound and up !

Also ........I'm a reformed speed freak and at least in my case have to agree with Aurthur P ! Going from shooting 350 grain arrows to 450 grain arrows has made my bow definately quieter and more pleasant to shoot !

I have been even more suprised at the lack of trajectory difference between shooting 300 fps and 280 fps ! I really haven't seen any major difference.........and have been left wondering why I strove so hard to shoot super lightweight arrows......low brace heights and fast bows !! Guess I'm a victim of marketing !