Scary to say the least . I agree with the advice above , 9mm or better , even the oddball 7.62×25 is better than the .380 . The Makarov was going to be one of my next pistols , as they carry very easy , I just dont like the 9×18 cartridge , if I find one that has been converted to 9mm luger , I’ll grab it .
You’re unlikely to see a Makarov converted to 9mmP, the design isn’t up to the pressures, nor is the frame long enough to hold the 9mmP.
I think you’re thinking of the 9mm Tokarov that can be switched with just a barrel swap from the x25.