I made a gun purchase at Cabellas it worked fine, however the next time I tried to use the chip was bad, I put up with it for a while then got a brand new card, it worked great until after I recently made another gun purchase at a local gun shop, the chip went bad again and I started getting access denied when I tried to use it.
I was able to get the access denied thing fixed, they blamed local retailers machines doing something to the cards, but I still have to get another new card because of the bad chip.
It could just be a coincidence that the chips going bad coincided with gun related purchases or it could be that there are some anti-gun scum at the card issuers monitoring accounts and intentionally breaking cards that are used to make gun related purchases.