However I haven't used mine since buying a press mounted bullet puller. It is a lot easier!!
RCBSI consider them like bullets and barrels, consumable. I've broke pretty much all of them. Or maybe I'm just too close to the missing link..
I don't even know where my impact bullet remover is since I got the press mounted puller.
Collet pullers don't always work like they're supposed to.
Then you are doing something wrong. That is only a guess. I have used mine for over 3 years on cartridges ranging from 22-250 to 338 Mag and have never had a problem.
Do not use a standard shellholder in a kinetic bullet puller. The reported cases of primer ignition that I have read about over the years were always with shellholders rather than the collet provided.I have a Frankford arsenal and a RCBS both work fine, but I have damaged the case rims using a shell holder, the collets give better support if the bullets are hard to pull.