If you do a search on here you will find quite a few positive comments. I have not heard anything bad about them as far as taking game.

The only real negative seems to be that since they are one size fits all and ML barrels are not all consistantly .50 cal, the FPBs are difficult to load in some guns.

My Omega X7 seems to like them. They load pretty easy and I have gotten pretty good groups with them. Have not yet tried them on deer but will use them this season.

Bottom line is you need to see you how your muzzleloader loads and shoots them.