Overpressured meaning +P ammo. It gives the bullet more velocity and therefore stopping power. Since .38 is kind of a low powered round the +P loads make a difference. Though they don't so much next to a .357 Magnum.....
The probably chose to go .38 +P to reduce recoil and improve accuracy. In order to use a .357 Mag well you need to practice controlling the higher recoil.
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