Do not try Z-Lang or any other .22 short ammo ! I can guarantee that you'll go through wriggly tin or any other more modern equivalent with it. A barn roof with a a series of .22" holes through it will not please the farmer.
You will have to be careful enough with an air rifle if it's close to 12ft/lbs and the roof is getting on a bit.
You will have to be careful enough with an air rifle if it's close to 12ft/lbs and the roof is getting on a bit.

