I took my recent purchase, a 1920 stamped police commercial, to the range today. The good news is, it feed perfectly with 3 different types of repro mags. The bad news, I had a "double" from the gun. Two shots with one pull of the trigger. The gun had worked with no problems with some factory 115 gr. ammo. At the time of the double I was firing some old 115 gr. reloads that are on the mild side. Does this sound like a pistol or ammo problem? If the gun, how do I fix it. thanks Frank