Yes, several years ago on a flight to Alaska one of my sons used what had been a range bag and turns out there were several 9mm rounds buried in a pocket. TSA found them all smiles, no big deal, they kept them, and we went on our way. This was in Reno. Bet a different result in New York City.
Maybe so. But in a foreign country, you have to follow their rules. Americans often feel entitled and thumb their noses at foreign rules.