I have never known of anyone having that problem because of the wrong headstamp, I have heard this rumor on many ocassions but my clients have been taking wildcat cartridiges to Africa for 40 plus years without question..Pierre told me that one time he had a cleint questioned out of curiosty by a Tanzania customs officer, and Pierre stuck one in the gun and closed the action and flipped the round out, all of the customs boys were impressed to no end and one of them requested a round as I recall and got it.
Also many of the custom people can neither read nor count, and I have had that minor problem pop up on several ocassions.
