This has been driving me crazy for awhile, so hopefully one of you guys can help out. My uncle gave my Dad a FN 49 before he past, but he did not give him any info about the gun. I have one round of ammunition that came with it, and I am not sure what caliber it is. I would like to sell the gun, but clearly cannot without knowing what it's chambered in. The head stamp reads "11" at the 12:00 and "51" at 6:00 with a star at both 3:00 and 9:00. It's taller than a .308 and shorter than a 30-06 .30-06 Springfield From what I've researched these are the calibers that the 49 has been chambered in: 8×57mm IS, 7×57mm, 7.62×51mm NATO, 7.65×53mm Argentine Can anyone name that caliber?