I have been using Hornady 140grn, SST INTERLOCK bullets for many years now. I use them in the 6.5x55 Tikka T3 loaded over 51.0 grains of IMR7828sc. Velocities are right around 2900fps. Accuracy is excellent. DO NOT USE THIS LOAD IN ANYTHING OTHER THAN A STRONG MODERN ACTION. The Swede actions stand a very good chance of KABOOMING with this load. It generates around 60,000psi.
I also use the 165grn SST in a Model 70 308 Winchester and a CZ 30-06. They are both loaded hot and both, like the Tikka, shoot those bullets like lasers if I do my part. I have taken Moose, Deer and Bears with all three cartridges and even Elk with the 6.5 and 06. All but two Bears have been shot through the boiler room, all have hit ribs going in and coming out and some have been put through on a quartering angle. I have never had one blow up, never been able to recover a bullet other than one of the 6.5 bullets that was caught in the snow on the bank behind the White Tail it passed through. It retained about 60% of its original weight. That animal was around 60 yards away so velocities were close to maximum generated.
The SST bullets have a bad reputation that came about from the early offerings that were constructed differently from the later INTERLOCK design. These bullets will do the job they were intended for if you do your part and put them into the right place. Two of the Bears taken with SST 140grn 6.5 bullets were shot through the shoulders at around 200yds. Again, both bullets passed all the way through both shoulders, smashing both of them and ruining them for eating. The exit hole was the size of my fist. This type of damage is not unlike the performance of may other hunting bullets being offered.
Again, this is my experience with NEW INTERLOCK SST bullets. I have seen the older bullets not perform as well. Maybe they had some teething issues, I don't know. Often I feel people use bullets that are light in weight and therefore light in construction, this can also contribute to these bullets getting a bad name. I know people that use the 95 grain Amax by Hornady and are fine with them. They are like grenades and seldom if ever come out the other side of the animal. What they do inside the animal is explosive and makes one heck of a mess.
If you really need to go the light bullet route for whichever reason, I am playing with the Barnes, monolithic offerings and the Hornady GMX offerings. I find they shoot almost as well as the SSTs and are almost as long. Being of solid copper construction they should hold together very well at the ranges I shoot comfortably. I will be able to tell you more at the end of this year's hunts.