My third series Colt Woodsman has 1 malfunction per 10 round mag when using this 22 ammo. The malfunctions are always the same, failure to eject a fired round. I have cleaned the chamber with a brass brush bent at a 45 degree angle. I never have this malfunction with my Ruger Mark 2. Is it the gun or the ammo. Maybe the Colt chambers are tight being it is a finely machined piece of art as compared to the Ruger. Any help would be appreciated.