I am not an expert, but since none have shown up to reply yet, I could mention that my own favorite Ammunition for any of the older or old Colt Model O or their likes, ( or any other sort of Automatic if old or cherished, ) is to use Lead mid range Semi Wadcutter Ammunition for Target work or Play.
One may buy this Ammunition ( including versions rated as being 'Match Grade' )Mail Order, or from any local Stores which carry a decent array of .45 ACP, and it is made and offered by most of the usual Brand-Name Ammunition Manufacturers.
It is also very easy to load it one's self with any suitable re-Loading Press.
Nice, friendly, Lead, Semi-Wadcutters, especially when loaded for the usual Target Range distances, are very easy on the Arm in every way, easy on the Barrel as a whole, easy on the Rifeling, less pressure spike, etc.
Jacketed, or FMJ or traditional 'Hardball' or 'Copper Patch' as it used to be called, is hard on a Pistol...or is hard on a Pistol, compared to Lead Semi-Wadcutters, anyway.


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