...you beat me to it...! yes, 7.62 X 25 rounds are almost impossible to find at the gun shows I have recently attended, and so, too with the popular 9 X 18 Makarov (”Mah-KAR-ov” this being the correct pronounciation...) rounds as well....can usually find some on-line vendor who has them, but even there sometimes not....
I just took my Godson to the range the other day. He went though about 100 rounds with my CZ52. It was fun watching him flounder at the start, then tighten his grouping with each reload.