That said, big bore RN lead bullets from a .44 spl, .45 LC or even .45 acp FMJ. are thought to be acceptable SD rounds, but SWC or truncated FP would be a mild improvement.
As Malamute eluded to in his post above, I too have found FP bullets to be more than a mild improvement when it comes to killing things. One of my old sig lines here on TFL is "meplat kills".
I've often wondered why the military doesn't use a TCFP of RNFP bullet as opposed to RN / ball when HP's are disallowed.