I have used the 270 & 7mm 140s with great results. I think they are slightly softer than an Accubond and expand a little wider. More like a ballistic tip. 2,000 fps seems like a sensible minimum velocity. I think you would get some expansion at lower velocities but maybe not full performance.
A local shop was clearing out all reloading components at 30% off, a clerk had miss marked the Interbonds at 30% off the SST price, I loaded up and did not inform them of the discrepancy, since I already will end up in the hot place for the rest of eternity, at least I should get a good deal once in awhile.
