My stepson is going to start shooting this year and I am not sure what arrows to get. He is shooting a Black Ice at 40lbs with a 28'' draw. He is 13 and 5'11'' and still growing. I am thinking of cutting his arrows at 29'' maybe even 29.5'' with 75gr tips and he can't decide between blazers or 4'' feathers. I think he is going to try to eventually shoot 50lbs in the future. Should I get 400s or 500s? I want an arrow that will work for him for awhile that is why I am cutting them alittle longer.