
Let's say you have X health and some %damage_reduction. You can stack %reflect to get insane amount of it, say, 90% and more.
An interesting thing about %reflection stacking is that it doesn't have a hard cap. While the latter ones could be re-reflected, auto-hit ones could not. After being reflected, while projectiles with a straight trajectory is reflected at it's source. Homing or curved projectiles are usually receive a random direction
Some projectiles are reflected as auto-hits, they can't be physically evaded.
The reflected projectile behaviour is somewhat ambiguous. If character have multiple sources of missile reflection, the %damage is an average of sources, weighted with corresponding %reflect chance of the source. Except that, unlike skills, reflected projectiles can fumble. Damage of the reflected projectile is based on your weapon damage, not projectile's original damage, and work the same way as %weapon dps skills.
I've tried to find a complete list, but no luck there. One should be very careful, not everything that appears to be a missile could be reflected. A huge single chunk of %reflect is very good though. Plain additive stacking the more %reflect you stacked already. etc for every source of missle reflect ).The practical view of it is that you lose some portion of %reflect compared to