I would be greatly surprised if any reasonably set up or factory 1911 of any sort really needed to be “throated” or “polished.” Pretty much all come that way as purchased now and need nothing in that regard. Misapplied “polishing” has caused more problems than it has cured most likely.
If you don’t understand how the gun works, think twice about polishing anything.
GI magazines will, in fact, run with a wider variety of ammo types than ball, to include rounded ogive hollowpoints and HG 68 clones. They will not run with short OAL button nosed target semi wadcutter.
A rule for getting along with a 1911 is do not feed it whatever you can dream up, feed it what it feeds well. In short, this is a longer overall length round with a rounded ogive and a rounded meplat edge if it has one.
JMB knew what straight lip magazines were. In designing a magazine for the 1911, he bypassed a straight lip design for a tapered lip design.
With apologies for my thumbs in the photo, here is a photo of what a tapered lip design does that a straight lip design does not....e.g., provides a less angled approach to the chamber, and a smoother and potentially more reliable feeding path for most 1911’s. The photo shows a round in a tapered lip magazine rises as it goes forward while a straight lip design does not.
https://www.google.com/url?sa=i&url=...AAAAAdAAAAABAD
Scroll down until you can see the picture with my thumb in it midway through the thread.