I shot away several bricks of that Aguila ammo decades ago.
It is Copper washed, if my memory serves me correctly.
Never had any issues with it, but cannot remember anything that impressed me either.
The smell.....rimfire ammo manufacturers from Europe and Asia often use powders with a distinctive odor.
I remember when Ammomart [Xelex explosives, now Higginson's powder] sold Gevelot 22 ammo. It had a distinct odor, but was quality ammo.
They also sold some inexpensive ammo in red square boxes of 100.
It was manufactured somewhere in western Europe, and was quite greasy.
The name escapes me at present, but it accounted for hundreds of gophers and Columbia ground squirrels.
Never remember having a "dud" from this ammo.
This stuff really smelled terrible when you shot it!
But IIRC, it was about 79 cents per hundred, so a smoking deal for us youths who were financially embarrassed at the time. lol.
Regards, Eagleye.