Crowcreek is correct. The 9mm Mak was purpose-built to provide max performance in a small blowback pistol.
Another comes to mind, the even more powerful 9mm Browning Long. It was designed for max 9mm performance in a fullsize, blowback, service pistol, and it is no slouch, either, being very close to 9mm Luger.
I cannot see the advantage of switching a 9mm Mak to a .380.
I have used the 9mm Mak with FMJ's for some butcher stock shooting. It performs about a unimpressively as do many other service pistols when using FMJ's.
My Bulgarian Makarov is very accurate tho, and that is at least as important for the uses I put it to here on the ranch.
Formerly LeeSpeed; I believe in God the Father Almighty, maker of heaven and earth...and in Jesus Christ, His only Son, who was conceived by the Holy Spirit, born of the Virgin Mary...I believe in the Holy Spirit...the forgiveness of sins, the resurrection of the body, and the life everlasting.