Being bored during the stay-at-home order, I am reading reloading manuals for entertainment. I have always known HP-38 and W231 to be identical. Hodgdon's website has identical charges and pressure data for the two powders for 9mm 115gr bullets, but...Nosler's data is different for the two powders (see images below):

[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]

So what say you. Why is Nosler's data different for the two powders? Are the two powders no longer the same? Some other reason?

Wade

"Let's Roll!" - Todd Beamer 9/11/01.