What is this madness?

So, I've loaded some 62gr soft points (unknown manufacturer, they're pulls from American Reloading), shot some at 100 yards, and they're cratering the steel!



This is what my 62gr FMJ looks like, same 100 yards.



Same charge of 24.4gr H335, same mixed brass. I would have thought the SPs would do LESS damage to the plate, not more!

Yes, I did check these with a magnet.

What gives? It looks like they're being hit with m855!