Lj1941
Member
I have been cross checking Alliant's modern data against 20 year old data in my Speer # 12. This data is for 45 ACP.To my surprise most of it is EXACTLY the same. I am sure that some powders have changed just a little along with primers. The old deal about using modern data appears to be a moot point-at least with Alliant. The 20 year old data was for Hercules powder! Comments appreciated.