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Does BS6+ have any effect when rolling to hit with blast weapons?

How about something like preffered enemy?

When firing blast weapons, a higher BS decreases your scatter distance.
Preferred enemy does nothing for blast weapons for the "to hit" part, but you can still re-roll 1's for "to wound".

Alright thanks

BS6+ also helps with gets hot die of blasts/templates

Yup.

I can boost my Secutarii Peltasts up to BS7 for a turn - and unleash 20 (count 'em!) S3, AP5, Ignore Cover Small blasts.

Oh the things I've done with that - they so rarely scatter!

 Arlen wrote:
When firing blast weapons, a higher BS decreases your scatter distance.
Preferred enemy does nothing for blast weapons for the "to hit" part, but you can still re-roll 1's for "to wound".

Some rules support from the BRB FAQ

Q: Does the ability to re-roll 1s allow you to re-roll scatter dice?
A: No.