....and "dropping" bombs in space ...
>adjusts glasses<
This is possibly the least problematic bit of physics in SW! Resistance bombers obviously have artificial gravity internally, and store bombs in tall vertical racks. When released the bombs start accelerating 'down' under that gravity (just like Rose's sister does), and then continue outside the field at the velocity they have built up. There may be an anti-shielding advantage to munitions that are themselves unpowered or travelling at low speeds (this is the way the Jedi and Clones deal with Destroyer Droid shields in TCW, and sort-of how the Battle Droids penetrate the Gungan shield on Naboo).
The rest, yeah, bobbins. Best to assume that what with it being fantasy an entirely different set of physical laws apply in SW, it saves the noggin.
As to shotguns, maybe, but some kind of fragmentation device would be good too. Note that the Jedi have no obvious defence against the green 'sonic' weapons that the Geonosians use in AotC - suggests that a flashbang packed with random sharp things might settle their hash.
I think PJ's theory about Beskar nullifying the Midiwotsits has merit: Timothy Zahn's increasingly-recanonised novels introduced a creature that could do that, before Midichlorians were a thing.
Canonically Beskar's properties goes back to the Rebels cartoon, and the scales of a Zillo Beast from Clone Wars were impervious to lightsabres too - while it doesn't look it, maybe Beskar ore is formed by organic processes, in the same way that real-life Bog Iron is leached by organically-concentrated acids and deposited in layers?
