Getting the 22 Mag to work reliably in an autoloader is a neat trick that many have tried to accomplish...and failed. The KelTec's in 22 Mag seem to work sometimes...but not well enough that you can really count on them...at least from what I've seen. I don't own either pistol or carbine but from all reviews they seem a bit spotty in the function dept.
I believe the manual will have ammo recommendation/s and it would be good to follow that if you expect it to run reliably. Sad thing is the ammo they recommend is often not available...so you run what you can find and it might very well choke a lot on it. Time will tell I guess!
Don't get me wrong about KelTec...I LOVE their stuff (mostly) and own several pistols but it seems that you have to adopt sort of a 'tinkerers' mentality with them sometimes. If you expect to rip it from the box (any of their guns) and have it work perfectly you might be disappointed. If you're willing to 'tinker' with cleaning, polishing, perhaps altering a spring here and there (or whatever is causing that one to malfunction) then I believe they mostly can be made to run reliably.
My P-32 has custom springs and runs (so far...knock on wood!) 100% with Federal ball ammo, as well as the P-11 which runs Remington Golden Saber 147's (handloaded) but won't run anything lighter well. The PLR-16 is the least fussy and seems to run well with anything I've stuffed in it..but gas operation is quite a bit less dependent on springs and frictions than the other methods. The 22 Mag uses bleed holes to retard the bolt (I think..going from memory here) and depending on the variation of ammo you use it might fail to cycle fully. If I had one of them...I'd get a couple extra recoil springs and gradually trim them down until it cycled with the particular ammo at hand if it was choking by short-stroking which seems to be the most common affliction on them.
AMT tried making 22 Mag 'Automag' pistols a long time ago and they were very inconsistent operating beasts. I sorted one for a fellow and the issue on it was the hammer spring was being pushed into coil-bind when the bolt was being blown back. Simply trimming the coils until it worked did the trick and the gun actually ran well. I don't know why they seem so weird to get right...but prepare yourself to tinker and you'll end up loving the gun.