Your CVA should have come with a #11 nipple. What brand of caps are you using?Ok but I still need the right nipple for # 11 caps
A #10 cap is smaller than the #11 cap. If you have a #10 nipple, the #11 cap will be loose. Yes, Track of the Wolf will help you get the correct nipple for your gun.
If the #11 caps require two hammer falls to fire, then the nipple is slightly over size. Go to your hardware store and buy a nut that fits your nipple. Most hardware stores have try boards with threaded test positions. The CVA nipple should require 6x1.00 threads. Thread the nipple into the nut and insert that in your electric drill. You don't want the tight chuck to damage the threads of the nipple. Set your drill to reverse. Using a small file, run that along the cone of the nipple to reduce the diameter of the cone. Keep the same angle of the cone. Go slowly. You will only need to take a small amount off the cone and the #11 cap will be an easy fit to the nipple.