Its called b-head tuning silly!!! I shot muzzys for twelve years, they did pretty good. Would say I only had fliers out to about a four inch pattern. This year I am shooting Tekan twos and they are nock buster. The montechs did not like my supermax 175, but they love my old supermag 150. You just have to find the right one for you bow. If you field points did well, then it cant be the bow. Keep trying!