I shot 41's with 5th. Army AMTU.
IMO: There is no more reliable .22 pistol ever made.
The model 41 was designed from the get-go to
function with total reliability using 40 grain RN standard velocity match grade ammo.
It should be 110% reliable with that ammo.
There should
never be a need to oil the top round in the magazine to get one to work.
As for Yellow-Jackets, lots of .22 pistols won't feed them reliably.
As for Thunder-Bolts, if there is worse .22 ammo being made today, I haven't run across it yet!
I had a brick of it last year that wouldn't go through the receiver mag tube hole of a 62A Winchester pump, a Browning semi-auto that choked on it, and a 10/22 Ruger that jammed occasionally with it!
And that is just unheard of with any of these guns!
The case rims were oval shaped on about half of them.
I had a lot of mis-fires in every gun I tried it in.
I'd suggest a through cleaning of the slide. Blast out the firing pin with brake cleaner and re-lube lightly with Rem-Oil. Same for the slide rails.
Be sure you oil or grease the hammer / slide interface where the polished cocking surfaces are.
Clean the chamber with a bronze bore brush & solvent spun in a drill.
Then try some good quality 40 grain ammo.
If all that don't work, you may have a problem.
rcmodel