The Classic range options in raids allow for 8 yards, and it is an 8 yard ability according to the wago.tools database EffectChainTargets value of "8". This can also be seen ingame when a player is in the 10yd range indicator and chain lightning does not bounce to them. This is mostly problematic in stratrgies for melee, that have a false sense of positioning to both attack the boss and not destroy your raid.
The Classic range options in raids allow for 8 yards, and it is an 8 yard ability according to the wago.tools database EffectChainTargets value of "8". This can also be seen ingame when a player is in the 10yd range indicator and chain lightning does not bounce to them. This is mostly problematic in stratrgies for melee, that have a false sense of positioning to both attack the boss and not destroy your raid.
The https://wago.tools/db2/SpellEffect\?build\=3.4.1.48632\&filter\[SpellID\]\=64390\&page\=1 link shows an 8 for
EffectChainTargets, which seems to be the effective bounce chain range.