I'll take a shot at the ranged stuff! We see the Vortex Beater mixing rockets with bullets, although it doesn't use rocket ammo - but what if there WAS a ranged weapon that used two kinds of ammo simultaneously? I present to you the Quantum Emitter:
Quantum Emitter: A bow, gun, and rocket launcher all in one. Can use any type of ammo, and fires two simultaneously.
Tooltip: "Arrows? Bullets? Rockets? All take em' all." or "Jack of all trades."
80 ranged damage
knockback: bullets - weak; arrows - medium; rockets - strong
use speed: bullets - insane; arrows - fast; rockets - average
40% chance to not consume ammo.
Additional effects based on ammo combinations:
Bullets + arrows: increased chance not to consume ammo
Bullets + rockets: increased velocity
Arrows + rockets: increased critical strike chance
Note: You can load up two of any type of ammo – ichor bullets and rocket IVs; luminite bullets and chlorophyte bullets; venom bullets and holy arrows; etc. It picks the first two different ammo types it finds in your ammo slots/inventory. If you only have one type of ammo, it will just consume twice as much of that one type and shoot it in two streams. This would be extremely useful for when you want to use a certain ammo for its debuff (ex. ichor) and a different kind for its damage (ex. crystal bullets/holy arrows) without having to switch ammo or weapons.
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Another weapon that I've suggested elsewhere uses ores as ammunition with different effects (in the form of meteorite projectiles). Alternative ores apply.
Meteor Launcher: turns ores into meteors and shoots them at enemies with various effects.
Tooltip:
90 ranged damage
5% critical strike chance
Strong knockback
Average speed
22% chance not to consume ammo
( 8 dmg) Copper-Gold - the meteorites give off light as they travel; Copper gives off the least light, Gold the most
(10 dmg) Crimtane - applies Ichor debuff
(13 dmg) Demonite - much higher critical strike chance
(15 dmg) Meteorite - meteorites ricochette
(18 dmg) Hellstone - causes burn damage over time
(22 dmg) Cobalt-Adamantite - higher velocity; Adamantite is the fastest
(25 dmg) Chlorophyte - homing meteorites
(30 dmg) Luminite - when a meteorite deals damage, three more meteorites are called down to fall on the location