I asked the question on here a while ago about removing chokes from barrels and I checked most of my rifles at the time (the break barrels anyway) and a lot of the BSA's seem to have chokes, one of the calibres didn't (I think it was the .25 I can't remember without checking again) but the general consensus was that a choke doesn't really matter and doesn't affect accuracy if removed but does beg the question, why put one on there in the first place if it does?
Pete