Roskoe,you are right weight is not a measure of anything except recoil.
I find a lot of heavy bullets [powerbelts are a good example] to be good varmit bullets but the rainbow trajectory makes it very chancy to shoot any kind of distance with them. On the other hand a properly constructed bullet at the right velocity will shoot flat and penatrate deep. Note the moose and elk that have been taken with 50/40 - 200gr Shock Waves.
I would go to 300gr Shock Waves for Griz or Polar bear though. Lee