What's the largest caliber PCP Pistol?

I was thinking about getting a membership to the indoor range nearby, but it's only 25 yards. Hardly worth the effort for a rifle. But a handgun would be fun. I know the Marauder .22 exists as well as a bunch of others, but surely someone has made a larger caliber PCP handgun. I thought it might be interesting to go to the range with a PCP pistol. People usually want to shoot my rifle at the range, so it would be cool to show them a larger caliber gun.