Back when I got back into BP I said there were 3 things I had no desire to get into..well I have broken ALL those "no desires" My problem is this..I have a Howell conversion cylinder for my 3 main revolvers, my Walker. 60 army and 58. The only one that is a pain is the 60 army (Pieta).I got this conversion from Taylors (Walker came from there too) and it cycles, rotates just fine, when EMPTY or having fired cartridges in it (45LC) Most of the time however IF I load it it will NOT cock, hammer will not pull back OR I have to "double cock" it meaning that I pull the hammer back, slightly let it forward, I hear a click, then I can full cock it to firing position. When it fires the first round it seems to be fine, I can cock and fire with no problem..Sometimes though I CANNOT get it to pull back to hear that little click. I also discovered I can sometimes push the hammer forward slightly then it will click and cock. I was thinking the problem might be in the bolt or cam area..Like maybe the leg of the bolt is not dropping off the cam..Any ideas?. BP cylinders work just fine also..