There's been some fine old wheelguns brought up in this thread.
Is the 57 pinned and recessed? I'd snap that up in a second. I'd much rather an N frame than a K any day. And if your plan is to feed them stout loads on a consistent basis, you'll see why after awhile.
I've got a 57, a 58, some 29's, some 24's and a 624. I had a 28, but allowed my missus to convince me to sell it to her daughter's boyfriend. I'll never do that again.
Hard cast loads through a 41 will put the hurt on a pig, pretty quick.