The Hazmat details are taken care of at the Point of Shipping. One fee of $20 should cover packages under 70lb, primers and/or powder and they can now be combined. I usually buy 32lb of powder at a time + plus whatever primers are needed. The good vendors like this one, TNT Reloading, will then waive the $20 fee. Of course, with the price you are getting, the fee won't hurt you. BTW, if this is a private seller he better have his act together. The shipper must receive any required permits and paperwork to be provided by the seller at the Point of Shipping, or the primers won't ship, at least not legally. You should ask the seller for details and price.