I previously owned the 6" version in 6 rounds, currently own the 4" version in 10 round. 6" nice target gun, love the 4" for a trail gun. We use to pound a brick a day through it at the range. Get a .22 bore snake to simplify your life. The 4" is a keeper.
I picked up a 10 round Model 617 used from an estate a couple of years ago. I absolutely love shooting it at the range.
Not only that, but the workmanship on it is beautiful,- smooth everywhere, with no sharp edges anywhere on it. The original owner must have spent his evenings hand polishing and cleaning it too, because it is in perfect condition. Paid about $500.00 for it as I recall.