I shoot an internal hammer CZ and have this problem if my primers are loaded flush or slightly below flush. I reload all my shotgun shells and leave the primer seated slightly high or proud, fires 100%. I think it needs a slightly longer firing pin.
I’m an ex Skeet Shooter and still have lots of bags of #9 shot. I load 3/4oz and it will absolutely lay down our shotgun targets, the pattern is the size of my fist at our distances.
SASS Alias: Skullbone Willie
SASS #: 111686
Where you are from: Bartlett, TN Memphis Gunslingers
How long you’ve been Cowboy Action Shooting: Since 2022