I liked Veritas version of the ammo penetration chart, but I didn't feel like spending two hours in photoshop every time an ammo tweak came out. All my charts start out at minimum penetration of 20 (Level 2 armor). I also made a penetration and flesh damage chart if you are into that kind of stuff. All values are taken from NoFoodAfterMidnight's ammo tables. The charts will be updated on the google sheets page as soon as I can get around to it, usually within a week at most.
Source: https://www.reddit.com/r/EscapefromTarkov/comments/eeag66/ammo_penetration_quick_reference_guide/
