[SauronOfMordor]

50 rounds is a standard box.

[nevadapatriot]

>50 rounds is a standard box.

For pistol rounds other than SD, yes. SD usually comes in 20.
.223/5.56 usually comes in boxes of 20, brands like IMI can come in either 20 or 30 to a box. I only buy multiple cases, what do I know.