Better than a FMJ, but as Ron notes, not reliable expanders. I have tested them in wetpack, they can expand nicely, fragment or not expand at all. SHTF bullets, sure why not, EDC, nope.
"Given adequate penetration, a larger diameter bullet will have an edge in wounding effectiveness. It will damage a blood vessel the smaller projectile barely misses. The larger permanent cavity may lead to faster blood loss. Although such an edge clearly exists, its significance cannot be quantified".