Another question here is whether or not the nose has be actually cut off, or whether it is just a flat tip. We have not seen a picture of the nose. The “Schlitze-type” bullet was loaded in .303 in England, not just in German rounds. I had both Eley and Kynoch headstamped .303s, when I collected them, with flat-point Schlitze bullets in them, and while they had the profile of a round-nose bullet with the the tip cut off flat, they most certianly were no sawn off.
The definitive answer would probably require pulling the bullet from the round in question and looking to see if the base is open, or enclosed in the bullet jacket. That is, unless the tip is very obviously been cut off.
I am not challenging the fact it may be cut off. I am just saying that factory bullets of this general description exist, and that no picture of the tip was included, and Sir Joost has not mentioned if he was using a slang term to describe the flat tip, or whether in truth, it has obviously been cut off as an alteration. If so, then it is an altered bullet. If not obviously cut off, it may be a real Schlitze bullet. that simply should be well defined here to close off this thread, rather than left hanging, open to question.