Originally Posted by Jessamy
Rolling Thunder and Elemental Overload have a lower chance to proc per target for Chain Lightning than for Lightning Bolt. If you have adds to bounce to and gain more proc chances from, then yes CL does more damage to your main target than LB does.
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I was confused that Jessamy mentioned Rolling Thunder in this case both in this thread and in Simple questions, because the wording of the talent seems to be exact about 60% chance for both LB and CL. So I decided to run some tests on a target dummy. Here are the results:
| Spell name | # of casts | Overloads | Rolling Thunder | Rolling Thunder % |
| CL | 40 | 2 | 26 | 62% |
| CL | 40 | 6 | 32 | 69% |
| CL | 40 | 4 | 30 | 68% |
| CL | 40 | 5 | 29 | 64% |
| CL | 40 | 10 | 34 | 68% |
| | | | | |
| Total | 200 | 27 | 151 | 66% |
| | | | | |
| LB | 40 | 17 | 37 | 65% |
| LB | 40 | 11 | 34 | 66% |
| LB | 40 | 16 | 31 | 55% |
| LB | 40 | 12 | 31 | 60% |
| LB | 40 | 16 | 35 | 62% |
| | | | | |
| Total | 200 | 72 | 168 | 62% |
Each row represents separate attempt. In each attempt I casted 40 times, then checked actual number of spell hits using Recount (thus calculating number of Overloads) and then counted Rolling Thunder procs in combat log.
Judging by results CL does not have a lower chance to proc Rolling Thunder on single target. It even ended up to be higher for CL than for LB but this can probably be attributed to RNG.
Chance to proc an Overload is indeed noticeably lower.
This should not change the overall conclusion about LB vs CL but I was curious about reasoning.