I'd bet my son has killed 200 deer with that bullet. He's 34 and still loves a 243. He started at 5 yrs old.100gr interlock btsp in .243 win has been a favorite of mine.
Given the success and desire for these bullets and especially over the life of the design, I wouldn't be a bit surprised to see Hornady discontinue them. It would match our society. We seem to have an allergy against success.