I have very limited experience with the SMK's on game but most here seem to be satisfied with the large bore SMK's.
I have, however, shot a number of whitetails with the 162 A-Max from a 7STW. On shots out to 500yds the A-Max is not only accurate & flat shooting (high BC) but its terminal performance is impressive. Lung shots result in animals dropping within 20-30yds. High shoulder shots result in DRT kills. Many shooters have had excellent results with the A-Max at much farther distances, I just haven't had those shot opportunities so can not relay any personal experiences beyond 500yds.