You're welcome!That might be an issue and I will look at it. Never thought of the follower bottoming out but if anything bottoms out that would be the thing that bottoms out first. Only other thing would be the spring getting coil bound.
Thanks for the tip!
In general, about 1/2 ctg diameter "extra" capacity is desirable if mag is fully loaded to nominal capacity. It's when things get "tight" that "downloading" of mags becomes required. Note that the first and foremost thing to ensure is that one has a properly functioning mag spring, of correct length for your particular mag. Second is proper, good condition main springs in the rifle itself. Make sure of these things first.
If a particular mag lacks about 1/2 ctg diameter of "extra" capacity, disassemble the mag and remove the spring, leaving the follower inside. Load the mag (usually upside down) to full capacity and see how much "extra' capacity is available. If less than about 1/2 ctg diameter, then trim follower appropriate amount, and re-test.
Try this test again, with the spring installed. Again, see how much "extra" capacity is available. If about 1/2 ctg diameter "extra" capacity is available, you have fixed the issue. If not, then perhaps the spring needs trimming. At least you have fixed one issue, and know where to proceed. Trim the bottom of the spring 1/2 coil at a time until desired "extra" capacity is obtained. However, if the spring needs to be trimmed due to over-length, and the spring is not known to be fairly new, then use a new spring.
This procedure has worked well for me, and has allowed quite a few crappy (and even fairly decent) aftermarket mags to be rehabilitated, and useful. Every magazine is unique, and what works on one mag might not work on an ostensibly identical mag.