I believe they toughened up the 150 gr. 308 diameter bullet. Kills and exits most of the time.
Sure was a grenade on a deer I shot a few years ago. Same with the 180 SST .308 on a mule deer and bull elk. The SST's shoot awesome but are too explosive for me (30-06 velocities). I have gone back to Interlocks and have been happy with their performance and accuracy.
