"Crossbows are ~~not~~ medieval guns"

Locked & Loaded adds a variety of fun crossbow enchantments inspired by guns in games, especially ULTRAKILL.

Enchantments

Max Level: 3 (III)
Obtained from: enchanting table, librarian villagers, random loot
Incompatible with: quick charge, multishot, pump charge

You can load multiple shots by holding crouch, then fire them in sequence when not crouching.

Level Capacity 1 (I) 2 2 (II) 4 3 (III) 6

Demonstration of loading multiple shots with indicator

Max Level: 1
Obtained From: enchanting table, librarian villagers, random loot, pillager outposts, trial chambers
Incompatible with: multishot, piercing, sharpshooting, rocketry, multichambered

You can load two projectiles at a time by holding crouch, up to 8, then fire them all at once like a shotgun. The more projectiles you load, the more spread out the projectiles will be.

Demonstration of shooting 8 arrows at once

Max Level: 3 (III)
Obtained from: enchanting table, librarian villagers, random loot, pillager outposts, trial chambers
Incompatible with: multishot, piercing, pump charge, rocketry

Arrows will ricochet off of blocks and arrow-deflecting entities. Arrows will also pierce mobs and reset their pierce count when bouncing, although they cannot pierce shields or other projectile-deflecting mobs the way Piercing can.

Level Bounces Pierce 1 (I) 1 1 2 (II) 2 2 3 (III) 3 3

Demonstration of arrow ricohceting to hit multiple targets

Max Level: 1
Obtained from: enchanting table, librarian villagers, random loot, pillager outposts, trial chambers
Incompatible: multishot, piercing, pump charge, sharpshooting

The crossbow will only load fireworks by default, other projectiles must be in the offhand to be loaded.
Loading an empty firework will give it a random explosion (with 1 firework star per flight duration).
You can rocket jump by detonating a firework near yourself in midair. Fireworks with more explosions will launch you further.
You can ride rockets by shooting a firework downward while falling. The firework can be steered using movement keys (WASD). The firework will fly at half speed and last 4x as long, but it will still explode upon impact or when its timer runs out.

Demonstration of rocket jumping

Max Level: 1
Obtained from: enchanting table, librarian villagers, random loot

After hitting an entity, the arrow will not be destroyed and can only be picked up by its owner until the owner dies, despawns, or disconnects. This will ensure you can pick up your arrows later to continue fighting.

Max Level: 1
Obtained from: librarian villagers, random loot

Instead of shooting a loaded crossbow as normal, you will start spinning the crossbow. Spinning the crossbow for more than a second will cause it to fire normally when released. You can spin two crossbows at once.

Demonstration of spinning crossbow

Max Level: 4 (IV)
Incompatible with: most other crossbow enchantments

Loading the crossbow will load 4 * level projectiles and take a proportionally long time to finish. The projectiles will be fired in sequence with a short firing cooldown. The enchantment is experimental and therefore unobtainable.

Level Capacity 1 (I) 4 2 (II) 8 3 (III) 12 4 (IV) 16

Other Changes

Vanilla Piercing has been buffed so that in addition to piercing shields, arrows can pierce closed shulkers, breezes, wither armor, and the Ender Dragon when perched.
Pillagers are capable of using the new crossbow enchantments
Pillagers will load their crossbow before running towards their target
Projectiles ignore invulnerability frames if the last damage was from the same attacker
Offhand crossbow has a unique pose

Migrating

Multichambered and Rocketry were originally from OmniCrossbow and Rocket Redux, respectively. The enchantments should migrate seamlessly. Nevertheless, maintain good practice and keep backups of your worlds.

Enchiridion compat is planned when Enchiridion updates.