When I reached 35 yrs. of age, i needed glasses and wouldn't admit it. My hunting buddy and I were driving deer for our two Sons out ahead , in the late season Pa. flint only deer season. 7" fresh powder snow showed there were four deer were moving out ahead . One doe stopped broadside at about 70yds. , but her head , and butt were behind two trees , one tree in front obscuring the front legs and head , and one tree covering the back legs. With fuzzy eye sight , I picked the end of the deer's torso , that might contain the heart/lung area. WRONG.......50 cal . ball passed through the liver , instead of the boiler room. Initial minimal sign was a gob of hair , w/almost no blood , and profuse deer tracks. My hunting buddy picked up a handfull of powder snow , and blew warm air on it and amazingly , the palm of his hand was pink w/ blood , so we knew we were trailing the right deer . About an hour of trailing tracks , and jumping the deer twice , where she lay down to rest , we found her just standing awating her fate. It wasn't the 170 gr. round ball's fault the deer went a half mile to her end. It was the dope behind the trigger that needed glasses , fault. I was thankful my friend was a skillful tracker , otherwise I would have had to track the three other deer in the group , and not have been on the correct bloodless trail possibly resulting in no meat.