no, its not mine https://www.egun.de/market/item.php?id=19497802

"7,62 x 51 R das Nato-Kaliber .308 hier in jagdlicher Version für Kipplaufwaffen"

seller is obviously not knowledgeable, thinks its a 7,62x51 Nato aka 308 Win with rim

for break action rifles.
7,62x51 R was the teutonic designation for the 30-30 Win.