I bought & used a variety of Ram -Line products , (that's the correct spelling for their products) back in n the 70's-80's, still have them, in a magazine drawer (or box)
Ram-Line made a "high capacity " (12 rnd) mag for Ruger's.22 semi auto pistols..bought a few for my Mk II. Found one in a drawer recently & tried using it..it still worked well.
Same with the all plastic ? rnd 10-22 mag I have, just pulled it from a magazine drawer, don't recall ever having an issue with it.
Maybe because it wasn't subjected to intensive / extensive use ?
I may have another 1 or 2 of these, as I soon learned to purchase spare mags for all the firearms I own.
I also bought a Ram-Line polymer stock, for a Win. Featherweight Mod. 70 .308 barreled action I bought online, while on sale.
I believe this was one of the 1st polymer stocks made, ( I'd bet it's one of the lightest.)
I bought a few of their (?) Mini 14 mags, were they they one advertised to function in both an AR-15 & the Mini -14 ?
I bought a couple, tried one of them , in my AR, & Mini 14, & it did work, as advertised. ( Not sure that is a Ram -Line product)
Maybe because I have had a wide variety of firearms, I rarely shoot any one extensively, I've rarely had a magazine related issue.
( I did buy a ProMag brand mag once for a 1911, taught me a lesson)
as far as Hi capacity 10 -22 magazines, anyone heard of this one ?
I also bought & tried using a 50 rnd Mitchell (?) brand mag for my 10-22.. it used a rubber belt to hold rds inside the plastic mag.
Discovered it had to be loaded carefully, so the rim of a rnd rode on top of the rnd that had been previousy loaded.
If loaded correctly, it would function perfectly, allowing all 50rds to be fired w/o a jam.
If one rnd had the edge of the rim drop below the rim of the proceeding rnd, it would jam.
As ammo prices have increased, I can't see many shooting a 10-22 like I used to shoot mine.
I'd load up the 50rnd, ( or other high capacity mag I was using ) and see how fast I could empty the magazine @ my target,
be it a metal plate, tin can, piece of wood floating in a pond, etc..
This was a long time ago, when a box of 22's was $ .50 - $1.00, or less...