I don't know about a magnet with those qualities, but I have penetration improvements with a magnet vs. without. The stronger the magnet , the more air pressure builds up, then The dart breaks free and BOOM. You can feel the difference easily. Wish I had a chronograph to show real numbers. Obviously a magnet is good for holding steel balls and nuts for sabot loads. The best option for a low-profile ( no darts sticking around the neighborhood )