I clean my brass using stainless steel pins and in cases with flash holes under 0.08 inch the pins can jam in the flash holes and yes you can primer these cases and the pins can stay in place. Once you have had to check 300 rounds of assembled 223 ammunition with a neodymium magnet you'll start checking flash holes for diameter.
Federal and Winchester handgun cases have flash holes that range between 0.068 and 0.074 inch and will jam pins. Remington has flash holes of 0.080 to 0.082 inch and won't jam with pins. I really prefer Lake City brass for 223, 308, and 300 BLK and all of these get reamed to 0.082 inch. Any gun show brass gets reamed. For handgun ammo I purchased Remington/UMC when was on sale. Yeah, I do have a stash, started it after the Sandy Hook shortages.
