I shoot a TC Triumph and had problems with the Winchester 209A primer not inserting all the way into the breach, thus preventing me from being able to close the barrel of my gun. I am going to try the Federal 209 and CCi 209 primers tomorrow to see if they cause my any problems. I am shooting the regular 209 primers becuase I am shooting the BH209 powder, which requires a hotter ingition than the regular ML primers.