Are you sure that the gun will "drive tacks" at 75 yds? I'm just gonna point out what the two guys above have pointed out. The two most like suspects in this situation are 1.) The scope isn't sighted in correctly or has been jumbled so how. I'd prolly sit it on a bench and once I knew it was on I'd practice. or 2.) Its not the gun, its the shooter. I would most likely suspect this. I shot a 12ga. up til two years ago for deer hunting. I switched to a ml because i could get effective loads that didn't knock the heck out of me. Hope this helps.