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Hello,

I was wondering if the Chooser of the slain's +1 to BS works when using a shooting attack against a flyer (with living lightening)

the rule states "should the Rune Priest make a shooting attack at a target that has line of sight to the chooser marker, he may treat his BS as one higher than normal"

The pertinent rules for shooting Flyers

Hard to hit (p. 81)

"Shots resolved at a Zooming Flyer can only be resolved as Snap Shots"

Snap Shots (P. 13)

"If a model is forced to make Snap Shots rather than shoot normally, then its Ballistic Skill is counted as being 1 for the purpose of those shots"

So when a Rune Priest targets a zooming flyer that is in LoS with the Chooser of the Slain model it has a BS of 1 (for Snap Shots) + 1 (for the chooser model) so will hit on a 5 or higher. So with an increased BS of 2. (instead of hitting on a 6)

Am I reading/understanding this ruling correctly?

Check p.5 "divide to conquer".

This has nothing to do with rounding up or down. It is about modifying a characteristic

Page 2 "Modifiers"
Additions before set value. So you'd get BS5 (4 + 1) then it would be set to BS1
So no bonus to snap shots.

I guess the confusion comes into play on when the Chooser of the slain's one higher than normal wording takes effect.

would normal be the Snap Shot of BS 1 or would normal be his BS4?

There's really not any confusion grendel083 hit the nail on the head. If you're firing a Snap Shot, it's BS1 period.

I would say no. Keyword here is "normal". Snapshot overrides your normal BS so the Chooser does not apply.