Not real fancy, but the controlled expansion and secured core of the 129/140 Hornady SST has never let me down from a 6.5/06 between 20 yds to just shy of 300 yds. This is on whitetails up to 242# dressed weight. Golf ball size to US Quarter size exits on ribcage shots is normal...good energy dump...lots of goo north of the diaphragm and still able to penetrate the shoulder on quartering shots with solid core integrity for deep penetration.