You don't need 600 T, just a few tons of superconductor should be enough to stop most bullets. No need run any charge through them, just place them so that most of it is between you and the bullet.
The 6 order of magnitude resonant eddy current induction looks like the more interesting solution. I could see this being done with a giant beamforming array that would be more practical than a giant steady state magnet. It would be pretty cool to melt a supersonic projectile midflight with eddy currents.
Easier said than done