Are you using the appropriate case holder? If so, did you tap the brass into the case holder on a piece of wood or something like it? Did you just get done sizing and leave sizing wax (the only thing to use, in my opinion) on? These are the first things I would look atI have a wilson case trimmer with the sharkfin. They sharkfin on mine dont stop the case from spinning when I'm trimming the cases. Anything I might be doing wrong?
yep thats what I did with mine too. dont make it too tight just tight enough to hold the holder without it spinning.Thought that might be the case. Just tighten the nut on the top of the fin that holds it in place. Very small increments like 1/4 turn and test. That should do her.