Basically where some of the different mags make a difference is with the length of the guide lips. A friend of mine from the forum has a Colt Series 80 govt and a variety of magazines. He also reloads and uses the Lyman 452460 a lot. Those familiar with that boolit know that the COL of the finished round is going to be shorter than those with H&G 68s or round nose bullets so that the forward drive band does not engage the rifling. Now with his GI mags, which are in perfect shape, he gets double feeds every now and then. He has also had the entire mag self-unload when dropping it onto a table from a couple inches above the surface. Now with his aftermarket mags (I do not know if they are Wilson Combats, Kimber Tac-Mags, etc), the lips on them are a bit longer and he no longer gets double feeds, etc. Those mags do not self-unload when dropped on a table either.
So aftermarket mags can make a difference with certain bullet styles.
I agree 100%.
Generaly speaking, when one sets about modifying the 1911 platform (or it's ammo) beyound it's design perimeters, it aint unusual to also need a specialty mag of some sort. I see that a lot with the shorty's, and/or when attempting to use non-standard bullet shapes.
That aint however, the fault of the original magazine design. All it means realy, is that the origonal mag design was intended for different ammo and/or for a different gun than we are trying to use it with.
Like I've said before;
A 1911 is a 1911, a 1911A1 is a 1911A1, and a Government Model is a Government Model. There's them three and their clones. Everything else is...well... is "something else". Who knows what kind of mag you'll need for that?....I surely don't.