Forgot to update my range trip and add a bit about a couple of upgrades I added after the second trip out.
First time to range using Federal American Eagle 158 grain JSP's was a pretty good break-in, I'd cleaned and oiled the gun but found loading the magazine was a bit of a chore at first, the spring keeping the mag door closed is REALLY stiff and the port fairly small making it a learning exercise to get each round seated. After about 25 rounds it smoothed up a lot and was pretty easy to load, though I believe the mag follower was binding up as I got the last round or two in.
The rear buckhorn sight pretty much sucks... totally obscures whatever is left/right of your target which seems like a poor choice in an iron sights rifle that may well be used on moving game. After a small drift with a brass hammer I got windage nailed down at 50 yards well enough.
Second trip out I'd disassembled the magazine and gave it a good cleaning. The mag followed is a crappy yellow chunk of plastic and I've heard a frequent source of problems... it seemed to have the same issue on the following range trip so I decided to replace it along with the stupid rear sight. The lever action, hammer and trigger are all smoothing up nicely after 100 or so full power 357 magnums and the only issues I've had with the rifle are easy fixes to an internet store.
http://store.stevesgunz.com/index.php?m ... ucts_id=44 - Replacement "Bullseye" Ghost Ring rear sight ($30)
http://store.stevesgunz.com/index.php?m ... ducts_id=3 - Replacement stainless steel magazine follower ($20)
... came out to $54 or so shipped and arrived a couple days later.
The sight was about a 5 minute install, I just drifted out the old sight and installed the new one... but while I was at it I took note of the fact that the barrel is tapped for a scout scope mount just under the rear sight base (4 tapped holes)! Not that I tend to make this a Mossberg style cowboy monstrosity... but always good to know about an undocumented feature. The mag followed was a one screw quick fix (bow-chicka) and after another good cleaning and light graphite lubrication was smoothly running the length of the magazine tube without the "sticky" feeling the plastic follower was giving.
Here's the shooters view of the rear sight now:

HUGE improvement over the buckhorn -- note the front sight is not quite lined up with the rear in the camera shot since I couldn't see it thanks to auto-focus, I'm sure I'll be making final adjustments at the range to get it nuts on.