This silliness is a strange mix of the gun culture, the East Coast culture and the human desire for attention.
Lot of guys who claim silly stories like this are holster sniffers who just want to be liked by the police.
"I bought ammo and a cops said 'what are you doing with that ammo?' and I got to meet a cop and he was impressed by me and that was cool because all of the danger and glamour and excitement."
Holster Sniffers=>