The JSP will also punch through soft body armor including Level II and IIIA with zero problems. As for car doors and whatnot, the JSP rounds are "barrier blind" meaning they are designed to go through auto glass, sheet metal, drywall, etc and still function as desired.
As for cinder blocks, I'd test that theory...
The whole reason the FBI went to a JSP and SOCOM to the "Optimized" brown tip (it's more or less a Barnes solid copper 70 grain TSX is because the issue ammo was not getting it done with barriers in place. Again, can't tell you much about the M855AA1, but it's not available anyway. But the "Optimized" round is the one that took out Bin Laden. Kind of a neat feather to have in one's hat.
And before you ask, I'm not, repeat NOT, telling you more about the Optimized, nor where to buy, nor raising the ire of Mrs. GW over your junkie habit of buying ammo. Your JSP is just fine. And the Optimized won't work out of your rifle anyway. (your twist rate sucks)
Anyway, carrying 855 and the JSP is kind of like buying a Ferari and using your stock 1985 Escort for street races. There really isn't a good reason to carry both when they both punch armor, punch glass, punch sheet metal, but one was designed to do it slightly better than the other.
You want to take out cinder blocks? Buy a Barrett.