I have been reloading by the book off and on for 30 years. I never use a rifle primer for a pistol prime or pistol for rifle. I find with the shortage of primers I may need to exchange the primers. What exchanges for what? I know small rifle, large rifle, and small pistol primers measure the same size. The large rifle primer is taller. Don't have any magnum primers left. What primer will the rifle primers work for, I am down to 800 small pistol, 1300 large pistol, and 0 magnum in both rifle and pistol. I have a lot of rifle primers as I load .308 and .223 for kids and myself.