30x100mm guidance sought

I collect small arms ammo but sometimes, when I see large ammo at low prices, I grab it too. This is exactly the case here. There is a lot of info on these two rounds. So I figured no problem finding about them on line. Somehow I can’t find a good website. May someone direct me to a good place to read about these rounds?


Some info here: dtic.mil/dtic/tr/fulltext/u2/a140367.pdf (Historical Development Summary of Automatic Cannon Caliber Ammunition: 20 – 30 Millimeter)
Pages 21-22 etc.

Briefly covered by Tony Williams here: quarry.nildram.co.uk/30mm%20cannon.htm (An Introduction to Collecting 30 mm Cannon Ammunition)