SSTs changed tip style and material once or twice. Some of those bad expansion reviews are from the older "sharp" and harder tips used. The first was called a PTX. The jackets were thick and the alloy was really hard but the tip was more rounded.

Now, .452s SSTs use the same tip material and shape as the FTXs. T/C eventually switched too but occasionally the older style tipped Shockwaves still pop up.