I have researched this topic pretty thoroughly. It seems the biggest concern with older data is if the powder composition has changed over the 40 to 60 years since the data was published. Having talked to people who know powder it seems IMR 3031 is the least likely to have any change. Having said that I feel starting at 29 grains will be enough margin of safety. From there any attempts to shoot the other loads will be based on observations of the 29 grain load results. The loads are from a trusted source I might add.
Darryl
For what it's worth, I worked up 3031 loads with 190 cast bullets and stopped at 28 grains because I had reached my velocity goal, accuracy was excellent, and I felt I was edging into territory that would see case life suffering. I have no idea what pressure I'm getting, but I bet it's fairly healthy. I actually took some grief on another forum for going that high with 3031. I dunno, it's a case of uncharted "Beyond this Pointe There Be Dragons" perhaps?
