I have been looking at the gun / armour section in David Brown's new WWII rules- 'O' Group, setting up a little duel between a Tiger I and a couple of Sherman 76.
There is a blog post up that discusses the duel and the processes.
Link
http://battlefieldswarriors.blogspot.com/2021/06/o-group-looking-at-gun-armour-system.html