I fully agree with 500 grains too fast except for the petals that might break off you could get the bullet to implode and not open up and when hitting a heavy bone you have more chance of bullet deflecting as well.
Had a client with a 300 Ultra mag and 180 gr barnes X which did just that folded in and didn't open up. But that was at 3200 fps.
-------------------- "Sleeping under the African sky I can see nothing wrong with this world!"