I also believe i get more duds from newer manufactured rimfire than I did when i was a kid 20 years ago. I dont have numbers but when i got my new ruger mark 4 i shot a bunch of brand new ammo from it and got misfire from all sorts of brands even everyones beloved CCI. I am currently using federal auto match as i have had the best luck with cycling and fewest duds and decent accuracy. I still get duds from those though. Pistol is striking fine so it isnt a weapon malfunction i just do believe its a quality issue these days. I dont remember any but the most rarest of occasions of duds from old ammo I used to shoot back in the day and most of those i got off the top of the dryer where my granddad emptied his pockets. That old man always had a few 22 bullets and some change in his pocket.