I recently bought a 23" 6.8 Rem SPC Contender barrel for an upcoming Antelope hunt. Accuracy on this barrel is super, .650" 4 shot group at 100 yards from a solid rest. This was Remington factory 115 grain open tip match bullets that I ordered from Midway. BUT, only about half of the rounds would fire, the rest just dented the primer. Has anyone else run into this problem? I am shooting an older original Contender frame. Could it be a weak hammer spring? I have not had this problem shooting factory Remington ammo with my .223 barrel . Thanks in advance for any information.