I was at the Hornady factory a couple weeks ago and the gentleman that I spoke with said that the sst was designed to retain about 50% of it's weight, the interlock 70%, and the interbond 90+%. I have been using 139gr sst in my 7mm-08 for the past several years for deer. I have always gotten complete penetration and my longest tracking job has been 10 yards. Ranges have been between 60 and 230 yards. I have been very happy with the results, your mileage may vary.
