What kind of ammo are you using? The American companies load 8mm Mauser to weak levels due to the chance someone may shoot one of the ancient Mausers that aren't suited for full spec. And you had better watch out for old surplus ammo (corrosive!).
Can you find another host for your pic? Always love to see a nice sporterized Mauser, mine is a Euro sporter job. I want to get a full WWII era military Mauser eventually also just because they feel so nice in the hands and are beautiful.
Mauser Werke, Schmidt-Rubin, Colt, Walther, HK, Weatherby, Browning, Ruger, Beretta, Savage, Bushmaster, Marlin, Mossberg, Remington, Saiga, S&W, Sig Sauer....a few friends of mine