Frenchy:
Not around here- you just have to hit the swingers and make it move a bit to confirm a hit.
I shoot 20 ga Norince SXS external hammer. Don't think I would recommend it though, too expensive for the ammo- the guys here get together and buy 12 ga in bulk so the cost per box is quite low. Don't forget, you need lead, and No. 6 shot or so. Too much smaller doesn'thave enough impact to move the swingers. Unfortunately, It was the only SAS legal gun I could find last year.
However, finding a 12 ga cowboy action in say the "trench gun" style is nearly impossible (none at Marstar in months) unless you have a lot of money to buy one of the more expensive replicas and are real lucky in being able to get one without having it ordered and waiting months for it to show up.
The Stoger 12 ga SXS with internal hammers wasn't available last year when I was looking, but I understand that some of them have now reached Canada, and they are cowboy legal.
I'm thinking of picking up one myself in the summer if I can get someone to buy my almost new 20 ga Norinco.
Niagara Glenn