the bullet diameter of the russian version I found once was 9,25mm and iirc thats .365
also the bullet diameter for the 9mm Makarov. there is no problem with a .366 bullet in a .365 barrel! think about the 404 jeffery - .423 and the 10,75x68 -.424 diameter where barrels of both diameter were used for both cartridges.

when you measure factory bullets of a given diamter its common to found them smaller than expected. not all but many
I load to many obsolete cartridges that I need so much standardisation as possible.