How will be the charge for training shooting of this caliber, using cheap light bullets, 90-100 gr? It is supposed to use bullets for Makarov, normal, and cast.

Powder charge?

Probably about 8 grains of Alliant Red Dot or an equivalent flake powder.
This load is recommended in many infantry cartridges. The 9.3X64 might need an extra grain or two.
You can look for loads on Cast Bullet web sites and in the Lyman Cast Bullet Manual

But I thought that 9mm Makarov bullets were .358 inch and the 9.3 are .366 inch? Will they still work?

If they do, I might try this in my 9.3 x 62 .... after I get my stock

Makarov has 9.3 mm - the only of 9 mm pistols. The rest of this group have the caliber of about 9.0 mm. And the diameter of the base of Mak brass is equal to the diameter of the Para - that's such a great miracle of Manitou.
Naturally, this light charge can be applied to 62 and 74.
But again, there are two cases : for FMJ Mak bullets and for cast ones - it is obvious that there are various options. Do I need a filler? Brass is very large.

Vashper,

In part it will be determined by how much of a reduced load you want. Are you wanting to shoot the 100 gr bullets at 300m/s or 700 m/s? While the .30-06 has a smaller case capacity it could provide a good starting point as there are several references which include loads for 100 gr jacketed and cast bullets.

Here is some data for the .30-06 from MODERN RELOADING - 2nd Edition - Richard Lee

100 gr jacketed bullet
Vihtavouri N-540 55.4 gr 3076 fps
63.0 gr 3142 fps

From LYMAN 49th Ed

110 gr cast bullet
Unique 14.0 gr 1677 fps
19.0 gr 2331 fps

Eric

Sierra is .363, I read that Hornady is .365. Rainier used to make a .363 (I'd have to check the bag.) but it looks like they have discontinued it.

I've seen Hornady at 0.365 and Speer at 0.364

There are self-made adapter for shooting this caliber normal Makarov cartridge. So, seems like a regular pistol charge will suffice. But the question remains filler.

Do not use filler in bottleneck cases; too much room for error. Use 5744 powder; it does not need a filler for light loads.

Vashper,

Does the adapter insert inside the rifle chamber and then allow you to insert a complete, loaded, Makarov pistol cartridge into the chamber?

Here are some schemes of adapters of various calibers:
http://guns.allzip.org/topic/164/277501.html

That clarifies the matter. For such an adapter I would use a regular load for the particular pistol cartridge being used. There shouldn't be a need to use filler.

Lyman 49th Edition with a 100 gr jacketed bullet
Unique 3.0 grains 639 fps
4.1 grains 887 fps

It's difficult to find a good turner for this:

so better to use regular load in caliber brass

I've seen similar adapters to shoot .308 in .30-06 and pistol cartridges such as you've shown. I haven't really seen them in use. I expect it is due to the cost to purchase the device and then the hassle involved with having to load and unload the device, one at a time. When it is all said and done it is easier to use factory ammunition or to reload your own.