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You can use self-propelled bullets, as I suggested a long time ago in a thread far, far away. It's actually a proven concept, we've had antitank rockets for a while now and the Gyrojet weapons were developed in the '50s.
The main problem with the Gyrojet was the low muzzle velocity (the rocket needed some distance before it accelerated to max speed) but with some reworking you could have the propulsion charge spending itself in the firing chamber. We do have explosives that burn fast enough. This way you solve both the recoil problem and the spent cases, because the whole round is ejected, and you have less moving parts.
The main problem with the Gyrojet was the low muzzle velocity (the rocket needed some distance before it accelerated to max speed) but with some reworking you could have the propulsion charge spending itself in the firing chamber. We do have explosives that burn fast enough. This way you solve both the recoil problem and the spent cases, because the whole round is ejected, and you have less moving parts.