My shooting buddy and I both have had very poor performance from the 50's Yugo 8mm. Many of his required up to four tries before firing. Some never fired. I call it the "UN Safety Ammo"......
My three hundred rounds (bought from Sportsman's Guide) had so few that would actually fire I ended up pulling them all down for the bullets. It's amazing some shooters report such 'good accuracy'.
My weighing of the components found the nominal 198 grain bullets varying from 194 grains to just under 200 grains.
Powder varied over about a four grain range too. The powder went onto the garden.
Now my 70's production Yugo 8mm - wish I could find more - LOVE IT! That stuff rocks! Excellent performance, fires everytime and is accurate!