Yeah, a semi-auto demands a generally harder alloy, except when it doesn't. There's only one way to find out - experiment. I've had them get cut up and deform like crazy in that slam banging, and it didn't effect accuracy much at all, other times it did, or seemed to. Suggestion: load a magazine full, fire one and eject the next one, repeat until the magazine is empty, pick up the unfired ones and examine them, then look at the target to see what happened there. Repeat with different hardness bullets/loads. Draw your own conclusions. There really aren't many shortcuts in matters such as this, when it comes to specific personally owned weapons. The internet and gun writers and conventional wisdom only goes so far, and then a guy has to put rubber on the road and find out for himself.
Remember though, the steering end of a bullet is its base, not its nose.
