I took this small buck at 385yds with my 6.5 Grendel, 123gr SST @ 2550 FPS. I didn't get any pics of the outsides, but entrance was barely noticeable while the exit was about the size of a golf ball. Buck ran about 20yds and fell over dead.
Entrance on the left and exit on the right. Got both lungs.
Seems like people have mixed emotions about the SST bullets. They have always performed well for me. Like others stated, take a good shot if at all possible.