Re: (mm Makarov
The 9 Makarov (9.3 X 18) is or Soviet design. In compact pistols of Walther PP design, it falls about half way between the .380 ACP (9mm Kurz or Corto) and the 9 mm Luger (9x19) in ballistic energy on paper.
As to hollow-point expansion, that will depend on the brand of ammo, and will vary greatly. Several USA makers now load 9 Makarov hollow-point defensive ammo.
Of course, hollow point designs are not designed for deep penetration. In cold weather locations, a "Carhart" canvas coat over several underlying sweaters has been alleged to been pretty good body armor, on several occasions, involving police shootings. One might be well advised to alternate HP and FMJ in the magazine.