My experience of BSA barrels is they can be very good, but seem to need larger pelelts.

The below chronicles my experiences with BSA barrels, including considerable input from Bozzer.

http://www.airgunbbs.com/showthread....ng-177-pellets
http://www.airgunbbs.com/showthread....-a-177-BSA-S10
http://www.airgunbbs.com/showthread....177-die-please

I've had far less hassle with LW. But the most accurate gun I currently own has a polished, topped and tailed, BSA barrel.