Well, as far as addressing the 'lack of positive expansion', I can say that the duty load chosen by the PD I retired from was the Speer 230 gr. GDHP.
In over a dozen OIS incidents using the CS45 as well as full size 4566's, the M.E. always removed fully expanded bullets. Always.

That was good enough for me. Still carry the round in 3", 4.25" and 5" guns.

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Ret'd LEO
SWCA #2275