I don't worry about the two that the op mentioned. I have used several different bullets and now shoot the 129 Interlock entirely in my .260s. They are very accurate, inexpensive and perform well. No need for anything else for what I do. I have read that the SST is a better bullet now, as well as the BT, but I will never load another SST in anything. There are too many other choices.
I shoot 147 ELDMs in one Creed, and Speer Gold Dot 140s in the other. The 129 does extremely well in the Creed, too, and I will probably go back to it, when these bullets are burned up.