I bought a Beretta 8040 Cougar (.40cal.) new in box and have shot less than 250 rounds through it. I can't get better than 6-8" groups at 15 yds (paper plate groups). My trusty 92FS (9mm) shoots 2-3" groups at the same distance. Both are being shot seated off a sandbag rest, so shooting form should not be and issue. I have tried Winchester 180 gr. FMJ and JHP. Also some Winchester SXT law enforcement ammo a guy had at the range and the shots were all over the place. Does the extra 1" of barrel make that big of a difference or do I have a lemon? Any suggestions?