With each punt that sails out of bounds or bounces into the end zone, the frustration mounts for Sam Koch.

The Ravens punter has been through a lot in his eight years in Baltimore, with many more memories worth savoring than ones he wishes he could kick to the curb. But the 31-year-old said this "little rough spot" over the past four games has been the most maddening stretch of his career.

"It's one of those things where you don't want to let it show," Koch said Thursday as he stood in a mostly empty locker room, many of his teammates as far from reporters as they could get.

Koch has at times displayed the form that made him one of the AFC's top punters, having dropped one punt inside the 10-yard line in each of his past three games. But with a handful of misfires, some of them costly to the 3-5 Ravens, Koch has netted just 32.5 yards per punt since the start of October. At a position with little margin for error, it has been the miscues that have garnered the attention.

"Sam will be the first to tell you that he's just got to play more consistently in games with punts, especially in critical situations," coach John Harbaugh said. "Sam has punted really well in practice. He's punted really well most of the time throughout the course of the season. But one or two not-so-good punts in a game, those are the things that cause you problems."

Koch feels he has been practicing well, and the coaching staff has said as much. He has felt great in pregame warmups, too, but it hasn't translated to the games.

"It's very frustrating," Koch said. "I put all the time and effort and work into trying to make that perfect game and that perfect practice and everything like that, and I think it leads to some of my bad balls. I try to be too perfect out on the game field. I try to be too perfect at practice sometimes. In practice, you don't have the game-time pressure. It's hard to kind of replicate that."

Eight games into the season, Koch ranks 28th in the NFL with a net punting average of 37.6 yards. He has dropped only 14 punts inside the opponent's 20-yard line, and with just 28 percent of his punts landing inside the 20, he is on pace for his lowest mark since 2007.

Koch has reached out to a few players who have been in his shoes, including former Ravens kicker Matt Stover, whom he still considers a mentor. Stover, whom Koch speaks with regularly, has told him to stay positive and keep doing what he has been doing.