I can state 5 pumps in a 392 with a Gamo Redfire pellet will just about tear half the skull off a squirrel at 14 yards. At 35 yards, a domed pellet will pass through any part of the squirrel on 8 pumps. A pointed pellet will pass through lengthwise at the same distance on 8 pumps.And at 5 pumps it will get your attention with the discharge. For that matter 3 pumps is louder than my 2400KT sans silencer.Any 392 that cannot penetrate all the way through a tin can on 5 pumps is either in dire need of resealing or is defective.now the trick is ensuring all the paint overspray in the muzzle is cleaned prior to starting testing to find the right pellet. I will add that these brass beauties seem to have a thing for Gamo Redfires and Predator Polymags.