Grendel mags?

[stanc]

You guys need to go back and look at the photo's I posted. The narrower stack creates spreading forces from the springs which cause the mag to bulge badly, much worse than it does with a proper stack. IE: The springs creates sideways (spreading) force rather than just vertical. In a proper stack each cartridge is in contact with the ones directly above and below in addition to the opposite column. Narrow stack only contacts at angles, creating the spreading force.

Waddaya mean, "You guys"? :p

I understand the issues, but I do think it'd be possible to build a magazine like Rambozo proposes. Make the walls thick enough and they won't flex even with the narrower cartridge stack. The trouble is, such a magazine almost certainly wouldn't be viable for use in existing rifles.