i remember dry firing my HW45 once . accidently . the pellet did not go in right when i was firing it with out looking while loading (silly i know) it fired and a puff of smoke came out . when i opened it to reload the pellet was still in the gun. sitting next to the barrel and the bit where the barrel screws are.
it smoked on almost every shot if i remember right . i bought the pistol new and had it open once but i never lubed it or cleaned it internally.
you could tell it had been fired due to the smell it made when it was fired .