I have owned a few Nylon 66 Rem. over the years and of course it's only my opinion they are one of the best 22's ever produced , The Inuit people favor these over all others because they are reliable and do not freeze up in extreme cold .
I have owned the semi 66(tube in stock), semi 10C(Clip), the lever 76. I have never had an issue with an ammo.
I just love these guns.