They're on the order of CCI for hardness, maybe even harder. My only experience is with some loaded Fiocchi 158gr LRN .38spl. The only gun I have that would pop them was a Ruger Security Six. It has a much stronger hammer spring on purpose. All my trigger tuned Smith and Wessons will reliably pop Winchester and Federal. But are unreliable with CCI. None of the S&W's would fire the Fiocchi. So, they're HARD....