This mod is inspired by BUMA (Bosses Use Meta Ammo) . Shredder didn't really see a point in adding config so I did. And also added things to make it mod-compatible. And better.

What the mod does: makes bosses and their followers use one of the best ammo that's available for the caliber. What bosses and followers? By default, all bosses/followers/raiders/cultist/rogues. Adjustable in config:

"botsToReplaceAmmoFor" : [ "arenafighterevent", "bossbully", "bossgluhar", "bosskilla", "bossknight", "bosskojaniy", "bosskolontay", "bosssanitar", "bosstagilla", "bosszryachiy", "exusec", "followerbigpipe", "followerbirdeye", "followerbully", "followergluharassault", "followergluharsecurity", "followerkojaniy", "followerkolontayassault", "followerkolontaysecurity", "followersanitar", "followerzryachiy", "pmcbot", "sectantpriest", "sectantwarrior", "bossboar", "bossboarsniper", "followerboar" ], What ammo they will be using now? Generally speaking best one. And it's also configurable in config. Here's the cool part: it supports modded calibers and ammo.
For vanilla ammo you can use https://db.sp-tarkov.com/search , for modded items you have to look inside mod that adds ammo. Innate support provided for Extra Ammo For Everyone and D.U.D.S. (They are not updated to 3.8.0 yet and simple package edit doesn't work and I cba updating them).

"ammoToUse" : { "intentionallyIncorrectCaliberEntry" : { }, "Caliber9x19PARA": { "intentionallyIncorrectCartridgeEntry": 1, "5efb0da7a29a85116f6ea05f": 1, "5c925fa22e221601da359b7b": 1, "ExtraAmmo_9x19_7n31M": 1, "ExtraAmmo_9x19_7n30": 1, "ExtraAmmo_9x19_VBR": 1 }, "Caliber1143x23ACP": { "5efb0cabfb3e451d70735af5": 1 }, "Caliber762x35": { "5fd20ff893a8961fc660a954": 1, "ExtraAmmo_762x35_Blackfang": 1, "ExtraAmmo_762x35_MAI_AP": 1 }, "Caliber9x21": { "5a26ac0ec4a28200741e1e18": 1, "ExtraAmmo_9x21_7n42": 1, "ExtraAmmo_9x21_7BT3_01": 1 }, ... } You can add new calibers for your modded calibers and ammo in here. If a bot uses caliber, it'll be replaced with ammo from config. Example: if bot uses 5.45x39, it'll be updated with my mod, if bot does not have ammo entry for 9x21, mod won't do anything about it. This means that mod is very cross-mod and cross-version compatible. you most likely can run this on like 3.5.x if not even older versions of SPT.

If you wanna be true homie or say thanks for time I've spent modding the game, feel free to send me a coffee on kofi

Cool part: I made config validation. If you add non-existent bot type, caliber or cartridge itself, it'll just skip it and inform you about it:

Not quite yet...