I had sent in a Form 6 in after June 16th, and my normal application information was rejected due to smokeless powder and primers being listed on the form.
I called in the find out why this was now an issue, in was told as of June 16th, smokeless powder was classified as an explosive.
My research on the subject did not show that smokeless powder or primers falling in the US explosives list.
I called in to get clarification and pointed out this point, they followed up on the question and got back to me with the response that the ATF considered smokeless powder an explosive as one of its components was listed in the explosive category.
I removed these two items from the form 6 and it was approved.
My other question was how one would be able to take powder and primers south, they suggested that I look into an explosive licence. I have not checked out the process or cost yet.