Thanks. I had an idea the gun was new-ish. I'm developing some handloads for my friend, the gun's owner. He has since dug up the instruction manual which lists the gun as capable of +P.
In any case, I'll not be loading to that level as he wants target ammo. I was just trying to be as informed as possible.
Thanks also for the welcome. I don't now own any Colts. I used to have a Police Positive circa 1922, but have since traded it for a Ruger Single Six in .32 HRmag ¬ó a gun I love shooting and loading. I was always afraid of firing my old Colt PP.