Don't shoot competition.
However, my dad and his dad hunted with .22's for many, many years and I've seen a lot of them at Appleseeds. Yes, I have some, too, but they are "old" ones for the most part.
My dad said they never had problems with duds when he was growing up and hunting squirrels/rabbits for the supper table. Maybe one or two over 20 or 30 years, but not at all something to make him shy away from one brand or the other of .22 ammo. Same for his dad.
Dad did believe, that when the ammo makers came out with the big jugs, tubs, buckets of bulk pack .22 that duds became more of an issue. He firmly believed the ammo sold in those was 2nd rate vs. the 50 round boxes. He got a lot of duds from those with his old Savage M29 pump and he could go back to the 50 round boxes and not have the duds.
I remember one Appleseed in particular, where a mother had brought her son and daughter to the 2 day shooting training event. The mother had a family 10/22, the daughter had a borrowed 10/22 and the son had an old Remington single shot bolt action .22. As the daughter and mother would shoot they'd have duds (don't remember the brand of ammo they were shooting) and they'd eject them and drop them on the tarp all three of them shared. After the stage was over (targets scored) the son would pick up their duds and put them in a pile by his rifle. The next stage he'd shoot their duds and the old single shot would pop one after another.
That brought back a memory of my grandpa's little Western Field single shot bolt action .22. Dad would never let us mess with that rifle (I do not have a single memory of shooting it or hunting with it) because he said if you pulled the trigger on an empty chamber it would break the firing pin. They'd had to replace it a couple times over the years when it had been loaned to a family member and brought back broken.
Didn't see this myself but my brother told me his buddy's Ruger Mk1 had to have the chamber edge repaired from firing pin damage while dry firing it. He didn't mention firing pin damage so I can't say much about that. It finally got to the point where it wouldn't fully chamber and had little spots raised up on either side of the spot the firing pin struck.
Now, to my last point. Many of today's modern .22's have a firing pin stop feature that keeps the firing pin from striking the corner/edge of the chamber when dry fired. That means the firing pin isn't capable of traveling as far forward as the older guns would allow. So, get into the usual machining tolerances along with the usual QC and you get some variation (one way or the other) in just how far the firing pin travels forward and how "hard" it hits the rim of the .22 cartridge case.
So, whoever figured out the firing pin mod Painter points out is a pretty smart and practical person. I'll have to try to remember it if I start shooting .22's again someday and have issues with duds. Got a sweet little SIG 522 I've only had to the range once, about 5 years ago, or so.