I have an Ingersoll Rand 60 gallon single stage compressor in my garage. It maxes out at 135 psi. Still, more than enough to push a stuck ball. As I said I used a 5 gallon portable tank set at 90 psi to dump balls from my .54 caliber. The trick is to get a good seal. If you get a good seal,I would think a small .32 or 36 caliber ball would easily come out.