I reload as well. Typically, I like to use a full tray of 100 primers at a time. That's what fits in the tube of the Dillon 550. It amounts to two boxes of 50 rounds. 5 trays consumes a bulk box of 500 bullets. No big deal on a progressive building .38SPL. It's a lot more work to use a single stage to load .50 cal. Especially 450 in a sitting.
My point was that, given the information provided, no crime has been committed. Given that he has been arrested, his property confiscated, and he is being tried in the court of public opinion as a potential terrorist this whole affair is pretty disturbing. As I stated in my other post, this characterization is what we can all expect once the government starts going after gun owners.
There isn't even any indication that the guy is an illegal alien or anything else. If that were the case then he would not have been allowed through the border checkpoint. It is legal for non-resident aliens, visitors, and other lawful non-residents to possess firearms in the US.