I didn't bother to test the proximity. I think mine have blinding, implosion, and spike. Thing is first thing I tried was the fighting lion, exploded on impact with all the enemies I shot. Only bounce I got was the giant captain from the public event while using the white launcher you can pull from collections that I thin has blinding grenades. If I held the trigger they bounced off him, if I didn't they exploded on contact, same gun same enemy. So I reinforce the fist thing I said all launchers explode on impact as long as you don't start the self detonation feature. Just tap the trigger like your trying to get a single round out of a auto rifle. Except waveframes they always bounce but that's because their mechanic don't work till they hit the floor.