my dad bought a Beretta 85 cheetah brunito, its a .380, well any way he got it maybe 5 years ago, we arent sure how long ago but it was boughten brand new.
it has only had maybe 150-200 rounds through it and only certain brands/kinds work, it does not eject, why is this? we have asked people, some say it isnt broken in enough, others said that it will always do that and that it is probably just picky on what is put through it, well i really have no idea, maybe someone here does,
thanks.

You might consider lightly polishing the chamber with jewelers rouge after makeing sure it is real clean. Polish the feed ramp as well. DO NOT REMOVE ANY METAL, just polish to a bright shine. See if that helps.

PS, make sure the slide rails are clean and VERY LIGHTLY oiled. And the magazine is clean.