Very long yrs ago I went to using CCI primers of the magnum range. The sole exception is CCI bench relaxation primers for your 204 Ruger. Hence I have only one large rifle primer, a single small rifle primer and only large and small magnum pistol primers to stock. Now https://dallasrglvv.blogsmine.com/32321119/the-definitive-guide-to-federal-large-primers-for-sale