ORIGINAL: OughtSix
Ok, first off,I would never use a Ballistic Tip or a SST in a 270 WSM. Sorry, you need a tougher bullet. Wounding game because we are too lazy to do penetratuion tests is simply bad form. The very best way to figure out if the bullet you intend to use on game is going to work for you is to try it on a re-producable medium. Not on an elk. Walking out to hunt game with an untested bullet is fool's play. Trusting the word of a bullet manufacturer is simply silly. Personally, I like to use gallon milk jugs filled with water. Very easy to reproduce, cheap, and effective. Granted, when using factory ammunition we are at the mercy of the manufacturer, but when reloading we can and should be more responsible.
Most 270 bullets are designed for the 270 Winchester. This means they are designed to open up a lower velocities than the 270 WSM. Therefore, if you wish to ensure proper bullet performance you will have to use a premium bullet. Nosler Partitions, Nosler Accubond, Hornady Interbond, and so on. OR....Slow down how fast you are shooting the bullet.
I dont think you could be more wrong. For deer you dont need a superdooper bonded bullet. I have no experience with the SST's but can tell you the 130 grain Nos BTs work excellent in the 270WSM.