Not known Details About smith and wesson 500
But I have not too long ago obtained a M&P 9mm which has the same problem with weak ejection. I've study that Many of these guns just "need to interrupt in" and up to now I've fired about 250 rounds of ammo (a variety of mfgs.Whether it is within the grip as opposed to the butt, the butt could are weakened or defaced. The ATF might have a document