To cut them off with precision first make yourself a jig to hold the bullets and create a place to cut each one at precisely the same spot, kind of like a small mitre box. After you cut them off you can drill down into them, again a jig and a drill press would be best so that you have uniformity (be very careful not to create heat with the drilling or cutting or you might have an explosion) - for uniformity of accuracy from one bullet to the next. It still might not expand though because you are dealing with a bullet designed not to expand and what you are doing isn't the same as re-designing the bullet. Hollow points and soft nose bullets are designed around that concept and have different styles of jacketing to help them expand.
A heart shot on a hog will definitely kill it, although it might run off a good ways first. I once saw a hog heart shot with a 270 soft nose bullet run flat out for over 300 yards. With a FMJ he might have gone even further. If you miss vitals a hog might even survive too.
I would expect that it would ruin small game for eating, but you never know until you try.....
