Larger .22cal Pellet head sizes??

Does anyone know of a particular line of pellets who's head size tends to be on the larger end of the spectrum, say 5.57/5.58 or larger?
I recently purchased a Benjamin 392 and the bore of the barrel seems to be unbelievably large so much so that I have yet to find a suitable pellet that fits the rifling without slack. I've tried a wide variety of pellets but nearly all look like a shotgun pattern at 10 meters, the closest match I've come across so far is H&N Hollow Points although I would prefer either a rounded/domed or pointed pellet.

I've tried many of the brand names without much luck, any thoughts or guesses?