Several guys have personally submitted loads to Armbrust, and there is an extensive collection of factory 16g pressures generated by the 16g reloading group
Here's an example, which is published old data so I think it's OK to share.

[Linked Image from photos.smugmug.com]

Of course components and powders change, so pressures change.
I think the data also confirms that it is not hard to reproduce vintage load, black powder, bulk and dense powder, pressures today

https://sites.google.com/a/damascusknowledge.com/www/home