great info, thanks. I'm just waiting on a reply from S&W before I look to get the throats opened to .430. I emailed S&W asking why the throats are so close to being out of spec relative to SAAMI. In the SAAMI docs, the throat is listed as .4325 +/- .004 which leaves a throat of .428 just barely within. After a reply, I'll be looking to find someone reputable to do the honing.

I am so glad I found this forum because before this I never considered reviewing the specs on my gun. I thought my leading issues were a result of too soft lead. I even went so far as to start electroplating my cast rounds. Came out pretty good too, I was plating 50 rounds at a time with a nice hard shiny coating. I was shocked when I tested the rounds and they leaded horribly too. Live and learn