It's not normal.
What issues are you having with the last round?
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Chip McCormick mags are fine on steel framed 1911's but the compressible follower design used will cause the follower to ride forward with the last round and "peck" at the feed ramp. In a steel pistol it's no big deal as the only damage done is some wear on the bluing on the feed ramp.
But in an aluminum framed pistol it will damage the feed ramp given the softer nature of the aluminum.
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Since you're new to the 1911 and we're talking 1911 magazines there are also feed lip considerations on various 1911 mags.
The standard Browning designed US GI 1911 magazine has long tapered feed lips that are intended for ball rounds and allow the round to rise up but don't release the round completely until very late in the feed process. They work great with hard ball rounds and offer the most controlled feed of the round. They are also incredibly smooth with the slide going foreword very easily and consistently and if you're shooting ball rounds these are the mags you want. Unfortunately they are less common and most people sell hybrid or parallel lipped magazine. That's because generally speaking they do not do well with semi-wadcutter and hollow point designs which are generally shorter in overall length. The shorter overall length allows the round to point upward at too extreme an angle as it moves forward and before it enters the chamber, with the front of the round then potentially getting jammed into the space between barrel and slide above the chamber.
Colt commercial pistols (except for the gold cup) started using a hybrid lip design where the same taper as the GI mags was retained, but the lip was shortened to release the round earlier. They tend to work well with FMJs (just not quite as smooth) but work ok with shorter SWC and HP designs as while the round can still angle up too sharply, the base of the round is usually released before it can angle itself up enough to jam itself into the area between barrel and slide.
The third type are parallel lips intended for use with shorter semi wad cutters and hollow points. They hold the round down longer (due to the parallel lips) keeping it level, and then quickly release it (due to the shorter lips). This generally works well with semi wad cutters and hollow points as they stay more or less level until they are popped up into the chamber. However, they won't feed ball rounds all that smoothly as the longer FMJ round is already being forced up the feed ramp before the lips have released it.
A final type is the Wilson 47D magazine. These take an entirely different approach and basically just throw the round up in a level attitude very early in the process so the slide can push it into the chamber in free flight. It's an attempt to create an uncontrolled feed process in the 1911, and as such it's the polar opposite of controlled feed in the 1911, and unfortunately it's not a perfect solution. It however does work remarkably well, especially in 1911s that suffer from poor feed geometry due to ill shaped extractors, poorly throated chambers, rough feed ramps, etc as it pretty much by passes all that in the feed process. If you've got a bubba'd 1911, a 47D magazine might get you back in business without having to fix everything that's wrong with it.
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Which brings us to two different philosophies in 1911 design - uncontrolled feed and controlled feed.
With uncontrolled feed you don't have to worry much about tolerances and angles, just start the round out high and level, release it early and let the kinetic energy of the slide do the work. In fact, it's the feed approach Glock uses in it's pistols and they are known for good reliability. In a 1911 however it can be problematic as it becomes very dependent on the kinetic energy and velocity of the slide and the relative spring forces of the recoil and magazine springs, and it can create some occasional random feed errors that will drive you nuts as you can't totally eliminate them.
Controlled feed is much more demanding in that the extractor shape, feed ramp and throat angles have to be precise, and if not you'll get some feeding errors. But the good news is they are predictable and repeatable and the causes are easy to diagnose and thus fix. Also, if all the specs in the pistol are correct, then the feed problems all lie with the magazine.