Found this source while looking into the post above that may be of interest to some.
https://bulletpicker.com/index.html
Quote:
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The first objective of this site was to post and offer a collection of public domain technical manuals and ordnance related books (whose copyrights have expired) scanned as PDF files. This collection went public in late May, 2016.
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I haven't gone through all of it ( it would take days ) it, unfortunately, does not deal with penetration data so much as just about everything else but if you want to know what a particular munition looks like and what kind of propellant and primer was used as well as Chamber pressure and Velocity this has that