A few months ago, I was going through a box of miscellaneous "stuff", and had an idea...
The 10-22 rotary magazines fit quite nicely into a speedloader pouch! I now have a dual pouch mounted on the sling, at the butt end; handy yet out of the way.
10-22 magazine pouch
1"...no religious Test shall ever be required as a Qualification to any Office or public Trust under the United States." ― Article VI, United States Constitution