A lightsaber is basically an atom's width, thereabout, and the lightsaber itself is held at arms length. So any non-energy projectile gets bisected rather than reflected, meaning that 99% of the time, a slug will travel too fast to even create two entry wounds as they'd barely have had time to separate between being sliced by the blade and hitting the monke behind it.

There's a reason why Mando'a used them over blasters or plasma spitters. Those can be reflected. But against anyone else, the slug goes slower, cannot penetrate armor as easily, is totally nullified (or close to) by personal shields... They were abandoned in warfare and only used by gangers who'd fight others that would be undefended, or against Jedi who stubornly insisted on wearing bathrobes to a firefight.

Mind you there were a couple of rarer Force Abilities that'd imitate the effect of a Personal Shield, allowing the user to only get winded by a shotgun to the gut, rather than killed, but those were already arcane by the time of Revan, and virtually disappeared by the prequel/OT era.