As you can see this is a very heated topic of debate.

Unfortunately there is much misinformation floating around about these rifles, much of it published over the years. There is a lot of people who don't fully understand the marking and what they can mean. For example, many will say if it has the 's' marking it is safe for modern ammo. This is not however what it means, as it has nothing to do with bore size.

I don't 100% trust Paul Scarletta for the simple reason he has written books on the Gewehr 88 and Mannlicher rifles which I have noticed misinformation and things that a bit of experience will tell you is wrong (such as a improperly loaded M95 charger in his Mannlicher book). However I would also argue there isn't really a 100% correct book on the Gewehr 88 out there.

Bob my information isn't from you. I learned about the .32 Win Special bullets after slugging my barrel and learning the diameter followed by looking at the bullets available on the market. As to the chambers, they did occasionally ream them, but that is likely due to manufacturing tolerance difference in the late 19th century than anything else. The odds of finding one with a short chamber in 2020 would be very small, simply due to the amount of Gewehr 88s that went though the conversion process, and the fact very few would have required the slight reaming required to begin with.

C&Rsenal has a good series on the 88s and 88/05s which can give you a decent knowledge base for free if your interested in learning more.