There is a good write up on the BSA - Royal, Majestic, Monarch and Herters' U9 in Bolt Action Rifles
by Frank de Haas. Diagrams, pictures, specs, - the whole smuck. Is there anything specific you wish to know I would gladly look it up for you.

I used quite a bit of Herters "stuff" in my younger days - hated to see the go.

--- John