My son has a BPS with a Kicks choke, he's been carrying it for about 17 years. I believe it's .665, but not positive. Other than being long and heavy it's a turkey killer. It shoots about everything well. Hevi shot, Long Beard, Fed Premium 6s or 5s or Blends. Shoots where you point it...which seems to be rare. I'd venture to say that about any of the turkey chokes out there today will be good in it.
I just realized that I posted this on a 20 gauge page, the gun I was talking about is a 12. Sorry