I'm considering a S&W M66 .357, new from a dealer for $350 or a 686P used for $450. I was surprised to find a new M66, I thought those were no longer manufactured. There is a slight side to side movement of the cylinder. Is this normal for a new gun? The 686P is used and has some scratches on the barrel. No cylinder movement. Both have 6 in barrels. I plan on using the gun for home defense, target shooting and maybe some hunting. Are there other things I should be looking out for? I'm a new guy and could use some advice. Thanks.