17 HMR/22WMR magazines

[Mobuck]

Anyone else having problems with them? I took the 77/17 out today to address a varmint problem only to find the magazine wouldn't feed. It hadn't been fired for a month-just sitting in the corner. I finally shook and jiggled until I got one round out of the mag and handfed it in order to get the job done. Pounded the mag against a tractor tire and shook some more until I finally got a second round out. When I took it back to the house, the follower was jammed solid. After a little fiddling, I was able to extract 3 more loaded rounds but at least 3 more were still in the mag. Four hours later, I picked the mag up and the follower had advanced on it's own and I was able to get the final 3 shells out. Put 4 back in and it jammed again.
This is the 3rd mag for this rifle that has gone poop after little use. One of those 3 only lasted 3 fills at the bench before it seized up.

 

[9x19]

It's not difficult to dis-assemble or re-tension the Ruger mags:

1.Start by removing the magazine from the rifle and removing
any cartridges that it may contain.

2.Begin disassembly by backing out the socket head cap
screw at the front using a 9/64" allen wrench. When its
almost out, push it back to push out the spring retaining cap
on the other side of the mag. Keep your finger on this piece
to prevent loss. Set the screw aside in a safe place.

3.You need to tension the spring by winding the spring
retaining cap in a clockwise direction. Start by taking up all
the slack in the spring, verifying that the long rotor vane is
visible between the cartridge feed lips. Note that the spring
retaining cap has six flats on it. With all slack removed, turn
the cap four flats more to tension the spring. Push the cap
into the mag shell, then tighten the screw.

4.Check the follower tension: it should be sufficient to snap
smartly back when you depress the follower with a drift or
screwdriver. If its not, loosen the screw and re-check the
tension. It should take somewhere around 4 flats to get
proper tension, maybe a bit more.

 

[Mobuck]

This really shouldn't be an issue with nearly new mags. These have never been exposed to oil, dirt, lint, or even direct sunlight-in some cases not even left loaded for any length of time.
I'll try the retension-had to do that on a couple of 10-22 mags I found that were loaded for 2-3 years(which still should not be an issue since I keep 4-5 10-22 mags loaded full time).