So glad to see this thread. I have bought up a bunch of these myself, even before I knew about the "Roberts" statement (it wasn't on the SPS site when they first marketed these) but they looked perfect for the Roberts to me. and maybe good in my .25-06 too. I have always shot the 100 TSX in the Roberts, and the "regular" 115 Partition in the 25-06. Mule Deer inspired me to buy some 100 TTSX for the Roberts, but I have not yet used them, and then I saw these .525 ogives for cheap on SPS and loaded up on them too. I also have not yet loaded any of them.
If anybody has further educated input on the BC (or even better...tested data), as well as any loads for any of the .25's it could be used in, please share them here.
This thread could turn into a really handy reference for all those who have bought these from SPS.

Thanks to the contributors,
Rex