I laugh at this, because I bought a brick (500 rounds) back in 1990 or 1991. My results were WORSE than what Lucky Gunner got. I had about a 50% failure rate in a rifle.
But I had a great training in clearing jams on a Marlin Model 60! Even to this day when I go shooting with 45er, I'll mention "Remember that old russian 'Junior' .22 ammo..."
H/T to Say Uncle