Thanks for reminding me of that. It was a good reason to go back over some of that info. This really is the most comprehensive collection of info on the 25-20 on the internet.
I did shoot my loads into water to test them, 75grn Speer retained 67grns 89%, and the Sierra 70grn BK retained 54grn, 78%. The Sierra opened more violently, but it is a polymer tipped hollowpoint, and starting out faster than the Speer.