Many people do
The ammunition is called .357 Sig. Most pistols in .357 Sig can shoot the .40 S&W when you drop in a .40 S&W barrel.
$600
Go to S&W website.
r By calling S&W with the serial number.
it is a handgun made by S@W 38/357
Buy a reloading manual.
About $500
Smith & Wesson
100-300
1961-62
100-1000 usd
You can request a letter from S&W on their website.