To expand a little on Fotch's suggestion, find a target -- a brick wall will do --, set the camera up on a tripod with the film plane at an angle to the wall -- 45 degrees is customary --, and focus on a mark on the wall -- I sometimes use a vertical strip of masking tape -- so you'll know where you wanted the plane of best focus to intersect the target. After the film has been processed, look at it with a magnifier. This will tell you whether the camera is focusing where you think it is.
What aperture are you shooting at? And which lens does your Graflex 22 have? I ask because their lenses, even the top of the line, weren't the best and had to be stopped down to get good image quality. Do your trial at several apertures. I'd do it from wide open to stopped down as far as the lens goes.