RCBS 9575 Primer Pocket Brush Combo Multi-Caliber Steel Bristles
https://www.tandktactical.com/shop/076683095756-rcbs-9575-primer-pocket-brush-combo-multi-caliber-steel-bristles-11837
https://www.tandktactical.com/web/image/product.template/11837/image_1920?unique=deee948
A build-up of residue in primer pockets can cause misfires. A couple of twists with the RCBS Primer Pocket Brush easily cleans out residue.
