Unless you are loading at max or +P, there is not much chance for a KB using these as reloads. Yes, the pressure will be higher. But I have crunched the numbers and even with Clays and 147s, pressure does not go above +P. If you are loading 160 or 165s, you are going to be over +P+ with these if using a charge for standard capacity cases.
The bigger issue is the cracking. I have cracked them on a single pass through an undersized die and two resizings with a standard die. I run a powder check station when I reload on the 650 and the stepped cases show high and so personally, I am not sure I will have an issue. But it does concern me.
Yes, I have seen the people who claim to have loaded the stepped cases with .5 grain reductions and have loaded them over 10 times without any problems, but I am skeptical of those claims and my testing has shown that it is not probable.
Have you contacted them and inquired about exchanging what you bought for their Remanufactured line of ammo? I might start there and see what they say. If you need a contact, let me know and I can get you one.