Basic load really means several things:
1. How many rounds of JHP you have for "social purposes".
2. How many rounds of FMJ to have for practice.
3. How many rounds you stockpile.
Starting with Item 3 first, that depends on the size of your wallet and your particular situation. With very few exceptions, I have at least one or several cases of the calibers that I shoot stockpiled.
For Item 2, it depends on how many rounds you shoot when you go to the range and how often. That's the nice thing about a stockpile, you can borrow from it if your trips to the range increase or the expenditure of ammo does. However, you will have to restock. The good thing about ammo is that, when stored in a cool, dry, airtight container, it lasts for years and years.
For Item 3, you'll have to buy a box or two of the various kinds of JHP defense rounds and try them through the Makarov. Your Mak may have a preference for a certain kind or it may not, but shooting is the only way to find out. After that, I'd stock about two boxes of the JHP brand your Mak likes.
The rationale I have outlined for the Makarov (9.2x18 or .380) can apply to most pistol or rifle calibers. Shotgun gets pretty expensive unless you get friendly with a shotgunner that reloads. Then you can stockpile your own shotgun ammot at more reasonable prices -- it still will not be cheap, but cheaper than factory ammo. In all cases you'll have to balance what you'd like to have against what you can afford (it's not a perfect world). However, opportunties to pickup ammo at reasonable prices do happen and that's when you add to the stockpile.