I'm moving up to MA from MD and having to give up my 25-rounders (the new Ruger ones) for my 10/22 (storing at family house in MD). 10/22 comes with 10-rounders standard, so just get a bunch of them (you can even "tie" 3 of them together in a weird pyramid looking triple mag configuration). To the best of my knowledge, anything bigger than 10 cap is a polymer mag, which tends to be looked at as post ban (I think there were a couple 3rd party manufacturers that did 25-rounders in the early 90's, but I don't know how available or reliable they are).