Quoted from Aniraf:
We had a lot of good players and everyone really seemed to enjoy the game. I saw only one beer barrel lock in about 150 games or so.
Very glad to hear that everyone had fun with Oktoberfest!
But... only one Beer Barrel LOCK in 150 GAMES? Honestly, without more information, I'm not sure what to tell you, but something isn't right there. The Beer Barrel ramp is not an easy shot, but it certainly shouldn't be that hard. Maybe try adjusting your "Upr R Flipper Main" coil strength up, or down. Check the level and slope of the game (intended configuration is for all leg levelers to be fully in, except for what's required to level the game left-to-right).
Just speaking for myself: I'm a solid but not exceptional player, admittedly with a lot of experience on Oktoberfest. If I'm just playing and not testing something specific, I expect to get a couple Beer Barrel locks EACH GAME. Certainly it's easier from a flipper MagNab, but even for players unfamiliar with the MagNab button, there are enough automatic MagNab opportunities in the game that players should be able to lock balls in the Beer Barrel. I'd love to hear any information you can provide on what you've seen here, so hopefully we can help guide you into getting the Beer Barrel working as expected for your players. One thing to note is that the game has audits for both making the Beer Barrel ramp shot ("Upper Ramp Made") as well as actually locking balls in the Beer Barrel ("Beer Barrel Lock 1", "Beer Barrel Lock 2", "Beer Barrel Lock 3"), so hopefully these can provide some objective data for the situation.