I recently bought my first civilian long gun (Ruger 10/22), and am on my way to rounding out my collection with both a revolver, and a shotgun. I have 0 experience with handguns. I've only ever fired machine guns, assault rifles, and rockets. Only docs and officers carried handguns in the Marines. I was neither. I'd like to have a revolver for home defense and open carry (legal in Maine). This revolver will also be carried by my wife. She'd prefer to have a revolver, so semiauto magazine-fed pistols are right out. From what I have been reading, I'm likely looking for a .38 revolver. I'm aiming more towards a used law enforcement wheelgun. Any opinions on the Police Positive? There are a few used ones in my area for reasonable prices. What is the difference between the 38 Special, 38 Colt, and 38 S&W rounds? Are they freely interchangable, or no? I'd like to keep the barrel at a 4" max, as anything more is a looong draw for the wife. I'm not looking to spend a ton, maybe capping out in the $350 range, as this weapon won't be fired a whole lot beyond training and marksmanship time. Any other suggestions of a similar model that might be lighter and handlable by my wife? She's a slim thing, and doesn't have a ton of upper body strength. Thanks in advance for any advice!