Thanks for your time and effort 5shot . I allways value your oppinion . I shot 2 deer last year both broadside shoots both down within 30 yards . These heads do some serious damage , they are not the sharpests heads I' ve ever seen , and that may be why some have had troubles . They need sharpening . They are very accurate . Oldhootowl maybe the guy who complained about muzzies penitration was useing the same heads for 3d targets and did' nt replace the blades before hunting . I cant see how there would be a penitration problem with a muzzy head with brand new blades in it , that is unless hes shooting armidilos they are allmost bullet proof . My friend shot one with a vortex minimax and it just ricoched off of his back , I later nailed him with a magnus .