We have used SST's for the past 11 years. To date we have harvested 22 whitetails with SST's in 243, 7-08, 270wsm, 30-06 and 300wm. We have taken 7 Bulls with them, one required and second shot. I took one @ 407 yards with my 300wm, a quick 23 degree downward shot that went through the front ball joint, and we found it longed against the rear leg against the thigh bone. That was a 165 grain and weighed 87 grains recovered. The bull went 50 yards and piled. Speed as has been mentioned changes their performance, but keep them under 3000 fps at impact and they are fantastic, specially on whitetail.