How can you handle the recoil of ultra-powerful sidearms?
In the near future, advances in warm superconductors, capacitors, and battery technology has led to railgun or coilgun projectile launching devices of enormous power. The energy storage (battery or fuel cell) can be carried separately and connected via a cord, but the superconductive rail that actually does the launching is hand-held and aimed like a small sidearm. The amount of energy given and the weight of the projectile can be varied, even on a shot-by-shot basis. The system is limited not by how powerful the gun can be, but by how much power the wielder can handle! Note that unlike a rocket launcher, the nature of the system demands that the recoil is felt directly by the gun itself.
Suppose the near-future technology has advanced to the point indicated in order to build the weapons described, plus perhaps a little more. Other areas of science will have advanced as well, and you can be flexible on this, as long as it seems like roughly the same time frame needed for the proposed advances.
In what ways might a soldier be able to cope with such a powerful weapon’s recoil? What is the effective limit to how much power he could use in weapon that one person carries and easily points?