I bought the carbon express hunter 350 in a 28" arrow with blazers and wraps. I chose thembecause of the charts and I think the spine is way to stiff with my bow set at 69#. I have maximas in a 350 and they shoot just like the400 spine arrows that I shoot, which are dead on. These carbon express hunter shafts have a real problem grouping. I had someone run all thisthrough a computer prgram using a Mathews solo cam bow and 250 would have been better.