You know, if some damn prosecutor tried to make an issue out of it, you can make him look silly with three arguments:
1) It has a fully modern transfer bar safety of a type used in almost all police revolvers and all current S&W, Ruger and many other wheelguns. It may look like an antique, but in the safety department it's anything but.
2) If you had shot an assailant with a high-tech Glock or something, the prosecutor would undoubtably moan about how you used a "high tech killing machine"; as is you used a functional modern reproduction of a 19th Century firearm so now you're a "cowboy". The prosecutor is actually playing "Goldilocks Gun Control" and would piss and moan about ANY gun because he doesn't like self defense; he's doing it to distract you from the fact that this was a clean lawful shoot.
3) You used ammo that is right in the same power/performance ballpark as typical police ammo. In 45LC that means the "combat loads" like the Winchester Silvertip, the Cor-Bon 200grain JHP (NOT the +P hunting loads), ProLoad's equivelent, etc. Peak energy is right on par with hot 40S&W police fodder or typical 45ACP performance. Or you're using a 45ACP cylinder, which is fine too.