I once used the SST's in my LK-93. Averaged 2-3 inch groups at 100, complete penetration, even through a nearly 200lb doe's, both front shoulders. However, both the deer I shot, the bullet NEVER expanded. I switched to the 300 grain 452 bullet and I'm glad I did. 4 shot group at just under an inch, at 100 yards, with 90 grains of RS. Shot a little doe last week at 50 yards. Knocked her right down. Complete expansion on exit wound,,looked like an inch hole. I noticed there was some expansion on entry. The two SST shots, both deer ran 40 and 100 yards,,, with NO blood trail.