Cleaned & inspected afterward and no apparent damage. I know it was caused by the lead bullet profile in relation to the chamber case mouth register and have pitched those into the remelt bucket. They where a round nose lead sold by a major manufacturer here in the Midwest.
The Kaboom caused me to question whether I wanted to pass on shooting 9mm rounds any longer since there at a higher pressure than 45 acp, but I here folks have similar issue with about any rimless cartridge.
Reloading is serious stuff and the details are important, best to avoid all distractions when in the "Loading Zone."