I bought a used 4" GP100 in SS earlier this year...February?? It has become my favorite revolver, besting my many Smiths in smoothness of action and believe it or not, trigger too. It has been PERFECT up until the other day. While test firing some hand loads (all on the mild 38 spl side as I am brand new to hand loading), I had three to five instances that when I pulled the trigger, the cylinder turned, but the hammer didn't pull back or it did just a little. Of course, the gun did not fire. I ended up getting it to fire by tipping the gun upward and then lowering it to the level position. This was after 2-3 times of failure. Then it did it again a couple of times and was "fixed" by tipping it up again. It has not done it again since and I have been trying to make it fail while dry firing it several hundred times.
What do you think? I'll probably take it in, but wanted to get some of your ideas.