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.
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Entrance on the left and exit on the right. Got both lungs.
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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.