I've been using an impact bullet extractor for nearly 4 decades. Usually to remove bullets that were charged with too much powder when doing a ladder test or some such. As my cases age from use the primer pockets get so loose that they will not hold the primer. I tap each case after priming on the bench. If the primer falls out the case gets discarded. No problems there. Lately as I've had to "pull" some bullets I noticed that several primers had raised. Never thought a thing about it. Just reseated them. While doing some bullet testing at Wildcat Bullets a couple of weeks ago something nearly bad happened. While Paul was in the house, I was in the shop and wanted to remove some Nosler bullets to do some testing with another bullet. I broke out my impact bullet puller. Load one,: three solid raps (with the neck tension on this cartridge 3 raps is typical) on the concrete floor, the familiar sound of the bullet and powder falling occurred. However, no primer was to be seen but could be heard making a couple of bounces around the shop. Load 2: On rap number 2, CRACK, the primer ignited! The primer then ricocheted around the shop. There was just a wisp of smoke from the primer's ignition at the case head. Either luck or divine intervention prevented the 83 grains of 7828ssc behind a 150 gr bullet from igniting creating a hard plastic grenade at about ankle height just under my head. The scenario may have been. Rap number one The primer rises and hangs up at the top of the primer pocket. Rap number 2 The primer slams to the bottom and goes off. The rest is as I said blind stupid luck or devine intervention. Some folks just need some outside help once in a while. Seeing as how I now live with loose primer pockets, the mechanical/hammer when into the trash bin. I'll get one of the new fangled actual pullers that doesn't ruin the bullet as my side cutters do. Hope this helps someone some where........ Experience is the best teacher. As long is it is someone else's experience!