As far as ammo, the best for me (in the 52) was the Remington 148 gr HBWC. Disgustingly dirty lube but boy did it shoot. Long gone but you might try putting out some feelers. Next best was Zero 148 gr HBWC.
The gun is a work of art. I read S&W sold them at a loss.
On your best days it will shoot incredible groups. Slack off on your follow through/technique and you can be badly punished. In short, it can be a maddeningly fickle gun at times.
In the end we let it go and moved to a Colt OMM.
P.S. In case it sounded otherwise, you should definitely buy the gun.