I've read that you should NOT shoot 32 ACP out of those, but I don't know why.
The serial number under the trigger guard is not useful in dating the revolver. To get the date of manufacture, read the real serial number under the grip panel on the left side. It may have a letter prefix, which will tell you the year of manufacture.
Of course, it is still not easy. For instance, the A prefix was used three different periods: On black powder models made 1896-97, and 1900. On smokeless powder models made 1909-1914. Then they complicated the C prefix by using it twice: If four patent dates made 1896. If five including MAR.15.88 made 1900.
Once you have the real serial number with prefix, you can Ask The Pros at
https://www.thefirearmsforum.com and they can tell you more about it. Pictures help them a lot.
BTW, Leon Czolgsz shot President McKinley twice with a .32 caliber, Iver Johnson Safety Automatic, 6 September 1901. The bullets didn't kill the President, his doctors did, the same as with Garfield.