Norma's V2 Reloading Manual has a burn rate chart that shows Reloader 22 at Relative Velocity 90.2 and Relative Pressure 81.1 and MRP at 89.9 and 80.1 respectively. Chart is from Eurenco/Bofors...
You'll see that much variation, lot to lot, same powder.
DF
Exactly. In fact more than one powder company has told me they try to keep lot-to-lot variations within 2-3%--which is why many loading manuals show differences between powders that have always been the "same," such as the newly manufactured batches of W296 and H110.
Vihtavuori claims they keep lot variation within 1%, and in my experience they do.
