If by 38 you mean the 38 special , the answer is yes , as both use a .357 dia bullet
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.
Case length, case capacity, bullet diameter
The outside of the cartridge case is .38. The .357 bullet fits inside the cartridge case.
No. They both use a different diameter bullet and the case is different. The .357 Sig case is a bottle-necked version of the .40 S&W case. The .357 mag is a longer version of the .38 Special.
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.
yes, when you use a lee dye the resizing dyes are the same you have to redo the bullet seating dye, though. the OAL is different
Buy a reloading manual.
Bullet diameter on a 38 is .357; on a 380 it is .355 Case is longer on a 38.
No, it is not recommended to use a .357 bullet in a .38 Special revolver as the .357 bullet is longer and may not fit properly, potentially causing safety issues or damage to the firearm.
Impossible to answer without knowing what bullet weight is.
You have answered your own question. The projectile has a diameter of .357"
The actual bullet diameter (as well as that of the .38 Special) is .357.