It is always a balance between wear and handling qualities
The shortest life expectancy, of quality magazines, seem to be single stack large caliber ones.
It isn't just the 1911, the H&K P9 and SIG 220 7-round mags have the same issues. The heavier .45ACP cartridges require a stronger spring in order to lift the cartridge column faster than the dwell time of the slide at the end of its rearward travel. The fatter cartridge means the feed lips must be wider apart. The cartridge column is being pressed straight up between the opening of the lips.
The shortest life expectancy, of quality magazines, seem to be single stack large caliber ones.
It isn't just the 1911, the H&K P9 and SIG 220 7-round mags have the same issues. The heavier .45ACP cartridges require a stronger spring in order to lift the cartridge column faster than the dwell time of the slide at the end of its rearward travel. The fatter cartridge means the feed lips must be wider apart. The cartridge column is being pressed straight up between the opening of the lips.