Welp fallout 4 is epic, but it is sad that you can custimize every aspect of your weapon except for ammo and looks. As ammo mods have existed before I really want them, and I am sure I am not alone.

example imagine taking an automatic combat shotgun and loading its drum with one of the following.

shells

standard ammo

(here for list complete would be craftible like ammo)

slugs

increased range and accuracy, lower damage.

gun nut 1.

rifled slugs

superior range and accuracy.

gun nut 2

dragons breath

shots a cone of fire instead pellets.

gun nut 2, explosives 1

explosive slugs

increased range and accuracy, superior damage

note: explodes on impact

gun nut 2, explosives 2

explosive rifled slugs

superior range and accuracy, superior damage

gun nut 4, explosives 4

these ammo mods would have a bonus to damage for teh weapon, but unlike resiver bonuses you can swap them out, for example explosive rifled slugs would be expensive to craft and would be hard to come by, as such you may want to use standard slugs or basic buckshot for most situations. the rule of thumb is the better the ammo the harder it is to come by.

another example 10mm rounds

10mm

standard

subsonic 10mm

lower damage and range, harder to detect in stealth

note: combined with suppressor makes it almost impossible to detect where the shot came from.

gun nut 1

high powder 10mm

superior damage, lower range and accuracy

gun nut 1

incendiary 10mm

lower damage, chance to light enemies on fire.

gun nut 1, explosives 1

10mm clean

pre-war grade 10mm ammo hard to come by even harder to make. (superior damage)

gun nut 2

ratshot 10mm

lower damage and range.

note: causes projectile to shoot 8 pellets which in stealth do heavy damage out of stealth useless.

gun nut 2

Armor piercing 10mm

ignores 10 DR

gun nut 2

explosive 10mm

high damage, lower accuracy

gun nut 3, explosives 2

explosive AP 10mm

ignores 10 RD explodes on contact

gun nut 4, explosives 2

The problem with this is ammo mods would require ammo working station and parts like powders, casings and materials. though most are in game like lead would be a huge requirement for ammo modding and crafting, but also copper gun powder, black powder and other materials would be needed.

There are already several ammo mods, although I am not sure if there is one that has that wide a variety of types of ammo. But just today I was reading about one that basically duplicated the Fallout New Vegas style of ammo creation where you have to find gunpowder and shells and so on. And I think a different one required you to build a dye kit before you could make new ammo, etc. Check out the Nexus ( nexusmods.com/fallout4 ) and you can probably search by category and find ammo mods.

not meaning ammo mods as in an ingame mod, meaning as a feature, aka not requiring an mod.... should have named this ammo types.