I have a CZ Woodcock that I have probably fired a few hundred rounds through or less. Today I was out bird hunting with 1 1/2 oz high velocity Kent Diamond Shot loads. I fired the bottom barrel twice and did not fire the top barrel. Afterward I noticed the primer was dimpled on the upper round that had been in the whole time. I am worried that this is close to a situation of both barrels firing with one pull of the trigger. The upper hammer had not dropped but it appears that the firing pin maybe moved from heavy recoil. These are a pretty heavy load but I have fired much heavier ones in this gun before.