I can't see any good reason to carry 7 round 1911 magazines when the 8 round versions work quite well. The 8 round Wilson 47D has never failed me.
The eight round mag requires a follower absent a dimple. The dimple is necessary to prevent the last round from slipping forward under recoil and being pushed into chamber ahead of the extractor. When that happens, the extractor is forced to snap over the cartridge rim, which it's not designed to do, as it places undue stress on the extractor hook. This is the same reason we are advised never to load a round directly into the chamber, but only to feed from the magazine. When you use an eight round magazine, you are causing this to happen, in essence, on the last round of every magazine, absent a very new mag spring.
PS The above only applies to 1911s with internal extractors. Auto pistols with external extracors can have their chambers loaded directly by hand, and thus it matters not the style of follower, as snapping the extractor over the rim is a non-issue.
