If your still looking for BR4 primers, Ciminos Guns & Archery in Merrill, WI ( http://www.ciminosgunandarchery.com ) has about 2000 that I literally just looked at before posting this. They’re not cheap though, $18.50/100. You could ask Deb (owner) if she’d give a price break if bought by the 1000. Occasionally she’ll do a little bargaining.
