It will be marked on the barrel.
If by 38 you mean the 38 special , the answer is yes , as both use a .357 dia bullet
no the 38 bullet is fatter and and the special is smaller
caliber 38 is a caliber 38. bullet dia. is .357 caliber deals with the dia. or measurement around the bullet head, not the bullet case.
No. The bullet is too big. A 30-30 is a .30 caliber bullet. a .38 bullet is .357 caliber
38 special factory load or re-loads
Possible that you mean a .38 Spl +P. That is a .38 Special revolver cartridge that is loaded to a higher energy than standard.
38
The .357 has a longer case and a heavier bullet; it is identical to a .38 in diameter but far more powerful. This is why a .38 will fire in a .357 but not the other way around.
Well, yes and no. Both the .357 Magnum and the earlier .38 Special catridge both use a bullet that is .357 inches in diameter. The .38 Special in not a TRUE .38 caliber cartridge.
.38 S&W. NOT .38 Special, but .38 S&W.
Bullet diameter on a 38 is .357; on a 380 it is .355 Case is longer on a 38.
No, you cannot.