I agree it can make them out of balance if drilled off center. Years ago,, I knew a guy who had a drill press,, and he made a jig to hold bullets in,, and was able to "center" them in it,, and drill them. he did ok with his work. However,, you can have bullet molds modified to make them hollowpoints,, cheap,, compared to what my friend did,,, or just purchase a different mold that has the HP pins.
However,, if it's pigs you are after,, I wouldn't use a HP design. I prefer a SWC with a wide meplate first.