Thats the single shot break open style rifle I'm assuming,sound like your not getting a good enough primer strike. Either the barrel is not fitted correctly to the action leaving to much space between the chambered round and the firing pin or the barrel is correct and the firing pin protrusion isn't correct. Couple things, have you tried it with factory loaded rounds to see if it does the same thing,and does it do it all the time with either reloads or factory ammo,if so I would call the factory you may just have a factory defect.