I got my Uberti S&W "Russian Model" revolver a few years ago in a private deal from a chap who had never fired it (having gotten it from a friend who didn't like it.) When I first shot it, I found that it "spit back" quite unmercifully … so bad that lead tracks were forming back along the outer sides of the cylinder …
Upon examining it, I discovered that it had no forcing cone at all … the literally right-angled rear face of the barrel was shaving lead to an alarming degree and back-pressure was blowing a lot of it back toward me. I have no idea how much was going sideways … but I sure wouldn't want to be standing off to the side!
At any rate, I was able to get a forcing cone kit from Brownells, and it has certainly made a world of difference ...