Absolutely not.
38 caliber revolver ammo
Most gun shops. Your Iver J is in caliber 38 S&W, which is NOT .38 Special.
Generally speaking, no, and, you should never try to fire any ammo from a gun other than what it is designed to fire. You may be able to get it to fire, but you could damage the gun or hurt yourself.
38 special.
Yes, 38 caliber ammo is available.
Yes. Shooting a lot will accelerate wear on the gun, but occasional use is OK.
38 caliber hand gun
No, you should not fire .357 ammo in a .38 Special gun as the .357 ammo is longer and more powerful, which can be dangerous and damage the gun.
NO, NO, NO, NO, NO, NO, NO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! DO NOT EVEN TRY TO DO THIS!!!!!!!!!!!!!!
No. The .38 S&W is a different cartridge from the .38 Special. Basically, the .38 S&W is shorter, fatter, and has less energy. It will not chamber in a gun meant for .38 Special.
No
Calipers are on car brakes. Caliber is used for ammunition. Any gun shop should be able to help you out.