Tip, great find! Got your number, thanks again. Ruger did produce 16,314 completed maximums and/or serialized frames. They destroyed, their terminology is "scrapped" about 5000 +/- completed guns and or serialized frames. The highest numbers out there were manufactured in March, 1983. Now I said the highest serial numbered guns. Ruger does not necessarily manufacture guns in serial number sequence............so, there could be some out there that do come back as manufactured later than March of '83. As far a the forcing cone change, your guess is as good as mine, believe it or not. That could have happened as late as March '83, around serial number 600-11000, so most of those that were changed have been scrappped. There were also Maxi's THAT WERE sent back prior to the ceasing of Maximum support by customer service for repair that could have been rebarreled or recut, with the 11 degree forcing cone. I'm not sure which they would have done, rebarrel or recut. Once I get down to the pins and needles of my serial number quest I may be able to get an answer to your question. My collection of Maximums do span the whole serial number range, from 600-00009 to 600-11577. 600-11588 is the highest one out there, by the way. I haven't examined every Max I have as far as forcing cone goes, at least not yet. If you are shooting yours, stay with Heavy bullets, IMHO, nothing lighter than 180 gr. I shoot 180, 200 and 210 gr cast w/check on top of 4227. It is a great powder for the Max. There are other powders out there that will work just fine. Lee over @ Single actions has a pet load and David Bradshaw as well. David is the one that turned me on to the forcing cone change many years ago. He has probably shot more Max rounds than at least 20 or so of us put together. Here and @ Single action David has put up many posts on Maximum loads. There are some other sites that post some as well and the book "Shooting Steel", a compilation of IMSHA magazine articles, is an great source for Max loads as well as some of the history of the round development. Hope this helps, enjoy that critter, they are literally a "blast" Coogs.