It will usually be marked somewhere on the barrel.
"My pistol is .40 caliber." "We were fortunate to find a manager of his caliber."
Impossible to tell from just the sn. if you found the serial number, you will be able to find the caliber of the pistol somewhere carved in the metal.
A 22 caliber pistol holds a dose of 22 caliber ammo.
most any large gun store will have them.
Provide DETAILED DESCRIPTION OF ALL MARKINGS.
You will need to take it to a gunsmith to find out.
Try e-gunaparts.com
The company that made it or the dealer that sold it to you can find out what kind of pistol and know the calibur.
how to breakdown and load 38 caliber iver johnson pistol?
Call S&W with the sn and they will tell you.
any gun or sporting store
This is a .22 caliber air pistol not a .177 caliber pistol. See the link below for the owners manual.