I fly with ammo all the time (in my checked luggage) I have never tested or found out the "limit" but I have travelled with 100 rounds several times. (5 boxes of factory). I live in Yellowknife, so I stock up on different calibers every time I fly south for ANY REASON. I just make sure I tell the baggage guy that I bought some hunting rounds whenever I have to put it in the xray machine. (for oversize luggage)