Dewd, the feds have better shit to do then bust you for pinz. Besides they are legal, except in CA and Illinois. I'm in CA but I bought all 100 pinz for my dog (veterinary purposes)
I'm not a big dog...but I always use a 1 1/2 for my ass shots. Then again...I use 1 1/2 for quads too. I use them for everything because there the only pins I can get cheap.