I think bounce is a bad term. Bullets spiral to maintain trajectory just like a football. Now ever see a bad pass thrown? It wobbles all over right? Same thing with a .22 when it clips something like a bone, flesh etc. because it has low mass it is deflected easily. Heavier rounds are "less" willing to be destabilized. MidgetTodd, well phrased response. Clarity is such an unusual internet trait anymore.