Having assembled the longest autocannon, I wasn't satisfied with its accuracy. I would also like to increase the damage, but I didn't find any options in the settings.

Use datapacks.
How to make and format a data pack: https://minecraft.wiki/w/Data_pack
Autocannon material format: https://github.com/Cannoneers-of-Create/CreateBigCannons/blob/1.18.2/dev/common/src/main/resources/data/example_createbigcannons/autocannon_materials/example.json
(in-game materials: createbigcannons:cast_iron, createbigcannons:bronze, createbigcannons:steel)
Autocannon projectiles: https://github.com/Cannoneers-of-Create/CreateBigCannons/tree/1.18.2/dev/common/src/main/resources/data/createbigcannons/munition_properties/projectiles
(flak_autocannon, ap_autocannon, machine_gun_bullet)

Use datapacks. How to make and format a data pack: https://minecraft.wiki/w/Data_pack Autocannon material format: https://github.com/Cannoneers-of-Create/CreateBigCannons/blob/1.18.2/dev/common/src/main/resources/data/example_createbigcannons/autocannon_materials/example.json (in-game materials: createbigcannons:cast_iron, createbigcannons:bronze, createbigcannons:steel) Autocannon projectiles: https://github.com/Cannoneers-of-Create/CreateBigCannons/tree/1.18.2/dev/common/src/main/resources/data/createbigcannons/munition_properties/projectiles (flak_autocannon, ap_autocannon, machine_gun_bullet)

If it's not too much trouble, could you explain it to the dumb? This is the first time I create a datapack.
I still don't understand what the path, folder and file names should be, since the autocannon is a structure of several blocks.
I did: datapack/bigcannonsetting.zip/data and pack.mcmeta/create_big_cannons/autocannon_materials/autocannon.json (example.json)
The datapack is readable by the world, but the edited settings do not change.