C.R.Sam, I have two 50 round Ramline magazines for my 10-22 and they both feed without a flaw. In fact, I'd loaded one fully, put it away, forgot where I put it, didn't find it until we sold and left L.A., and moved to Idaho. When I found it, I didn't bother to unload it, but took it out to the mountains to a range, cranked up and fired off the 50 rounds as fast as I could, just for "cheats and grins". Not one malfunction. That magazine had, to the best of my knowledge, been loaded for about five years.
I have four 25 round magazines, two Ramlines and two Butlers, and they never fail me. But, they are all around 12-15 years old. Maybe I just got the good ones, but they work very well.
FWIW. J.B.