I'm sorry...........but I just don't buy that !!! They may be slightly harder to open than some of the others .......but I have never seen evidence that they have not opened after impacting a deer !

What I have seen ........is people mistaking the small entrance wound as them not opening .........because they do , in fact, open after about 2 inches below the hide ! I have also seen people say they didn't open because when they pulled them out of the ground the blades were shut .......which is what should happen if the blades are not bent or the groove in the ferrule are not clogged !

I garentee you that if you would have thoroughly inspected the grooves in the ferrule of the Spitfire you shot you would have found "some" tissue or blood or hair or something !! Or if you cleaned the deer yourself......you would have noticed that after entering the chest cavity that there was a big triagular cut slicing through the organs !

I just don't buy it !! I have seen 10-15 deer shot with them (including 8-9 by me) and all of them opened ...........even one that was shot by accident that was covered in dried blood .......it still opened and killed the animal in short order !!