When I used to shoot Muzzy's I found that they were a little finicky. The groups were always larger than with field points and if the wind was blowing they'd fly really weird, kind of like a knuckle ball. Not so when I finally bought my slick trick magnums, they fly like darts and group size shrank to the same size as my field points. Not much need for mechanicals when you have a fixed blade that flies like a trick does.