Another consideration is bullet weight. After drilling and putting a screw in, or what ever the modification may be, the bullet weight must be in line with the powder charge. A friend of my Son filled a hollow point with epoxy mixed with steel shavings. What he was trying to invent was a bullet that had some potential to pierce ammor I guess, who knows. But because he increased the weight of the bullet significantly, the pressures went sky high splitting the case and blowing the primer, and fortunately the only damaged was to his model 10 S&W. The cylinder fractured and he couldn't get it to open without using a mallet to beat it open. The 5 unfired rounds still in the gun made it a little freaky. As soon as I heard about his little experiement in the works I sounded the horn, so to speak, and told my Son to make sure he is well back away from his friend when he pulls the trigger!
This is the kind of stuff that gets people hurt. If a guy wants a hollow point go buy one, or use proper methods listed in the books for making your own. But to just drill a hole in a FMJ is risky business at the very least. I can't really believe anyone would inspire such dangerous hourse play!