I can just imagine if we could find a substance hard enough to load, and soft enough to actually swage [Sp?] though a tight muzzle: so you have a bore that progressively tightens to a small muzzle, and the projectile "plops" out at the end: a long, thin "thread" of a projectile at supersonic speeds...

Like a needle gun, only that the needle is extruded by the massive pressures squeezing the soft projectile through a reducing bore... Crazy...
It has been tried. Even with steel projectiles:


https://forum.paradoxplaza.com/forum...941-42.365731/

I used to shoot skeet from time to time with Hermann Gerlich's son who also bore his father's name. He was in his eighties at the time, and would use this beautiful Gebruder Merkel o/u:

http://halger.dk/guns/oldengland.html