Agreed on all of the above. If you want pass through, shoot a tougher bullet. Then again, 15 yds isn't that far. I shot a mulie buck at 180 yards with a 200 grain Barnes TSX from a Weatherby 30-378. Plenty of gun and using a tough bullet. Went throught the vitals and busted the opposite shoulder, taking the top of the heart off on the way. The deer ran 40 yds and slid another 20 down the embankment. He was dead on his feet and didn't know it. What more can you do besides a neck or head shot?