When "Hot Cores" first came out in the Sixties, I bought a box, stood one on end and cut it in half, through the middle. I found that despite that Speer implied that the cores were bound to the jackets, the cores were loose...they were only retained by shape of the jacket. However, that was then, this is now...they might have improved/changed them.
Also in the Sixties, I was occasionally buying .44 Speer pistol bullets for reloading. I was frustrated to find that in most boxes of 100, there would be at least one defective bullet in the nature of having a core cut too short and not filling the jacket. Despite the fact that I liked the design of those pistol bullets, I decided to stop buying them and their rifle bullets inasmuch as if there quality control was that bad for their pistol bullets, I reasoned that it was likely no better for their rifle bullets.
Sorry Speer...no Speer bullets for me.