My own experiences show that partitions normally retain about 60% of their weight.If you want the ultimate in penetration the 140gr failsafe will out penetrate the 175gr partition.Bullet construction is far more important than sectional density.I have however killed several elk and moose with the 140gr partition and penetration has never been a problem.They always penetrate more than enough whether shoulder shots or raking shots are used.I never judge a bullet based on one experience because all bullets can fail at one time or another.I did see a 250gr speer out of a 35whelen break up on the shoulder of a mule deer in spite of the high sectional density.