RE: an interesting site
I've used this calculator too - they have some good info on their website. They have a nice ballistics calculator too - you just need to know the BC and muzzle velocity of what you're shooting. I have to guess on the MV because I don't own a chrono, but it's still useful.
The "hits" calculator is pretty cool - I think it's a pretty good estimation of game-getting ability - instead of just using foot-pounds of energy, or the "Knock - Out" formula (I think it's called) which is weighted too much towards heavy, slow projectiles.
WOW - I just did your 500 grain conical example - we talking Cape Buffalo and Grizzly bear territory here? Even the old .45-70 load - 405 grain bullet impacting at 1000fps or so is pretty impressive - no wonder so many buffalo fell to it.