I use the 250 grain shockwaves which is literally the exact same thing as the sst and it's an awesome bullet. I push it with 130 grains 777 pellets in my Optima and took 4 deer with it last season, 4 shots 4 kills. The farthest was a buck at 205 paces and it hit right on without any holdover even while i had the scope zeroed in at 150 yds. The bullet even mushroomed perfectly at that distance, the other 3 does were from 90 to 125 yards and all were pass throughs and none ever went farther than 25 yards. If anyone ever asks I would always recommend either the shockwaves or SST before trying anything else.