Took the 6 PPC to the range last weekend and fire formed the last 25 cases out of the 100 new ones that I started 4 or 5 years ago. My friend and mentor that I shot BR with passed away back then and I haven't shot the gun much since then. It is time to load more and start using this gun again. I remember Jon showing me a couple of paragraphs that someone on here wrote about tuning the 6. As I recall it said that for every 6 degrees in temp increase you added another 1/10 grain powder, and the same if temp went down. It was very good info and I don't remember who posted it, maybe Gene Beggs??? If anyone can figure out what I saw and point me to the original document so I can print it and try and understand how to use it I would appreciate it. I have a good load that uses H322 and Berger 65 grain flat base bullets, but it has to be in the 70s or less to be in tune, and I seldom get that around here. Thanks for looking Mark