5 grains is what legal arrow weight is in idaho and ibo for there standards as well. Ibo should be the same w 30" +/- 3/4" draw and 5 grains. - 1 fps for every inch of draw less and + 1 fps for every inch over 30". Anything much over 300 fps would be far fetched but he might just hardly break it and then I might win.