Quite a few years ago before going back to the 7mm-08, 7 RSAUM and then a 7mm Rem Mag, we used the 130gr, 140gr and then the 150gr SST on our 270 Win's.
The 150gr worked best. At close range it caused hydrostatic shock and at longer ranges it still produced fast kills. Don't remember ever recovering one, I believe all left exit wounds and caused severe damage to lungs. These will go through the shoulder as well, they always gave good penetrarion.
The 130gr and 140gr didn't always exit and although they did produce fast kills, the 150gr seemed to kill a bit faster, only by a few seconds but those seem like minutes when waiting for the animal to drop.
Many deer were taken with the 150gr and my dad also took a few elk with it, before going back to 7mm cartridges. All were one shot kills, except for one elk that was hit a bit back and following shot did the job.
Hope this helps
Luis