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If a 360BPE case does not enter fully, I suspect the chamber is for the German case head (D) which is smaller than the English case (E case).
The 9.3x72 brass that I have appears ton have the English head diameter. I have had to thin the head @ the web using a small lathe and then resize the case by pushing it all the way into my 9.3x72 dies without the shell holder.

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Prior to 1909 every gun- or ammomaker used his own dimensions. All 9.3x72R cartridges were black powder – lead bullet designs originally. So all factory loads are essentially “Nitro for Black” loads to this day. There were four different cases, all nominally 9.3x72R. We may dismiss the 9.3x72R Sauer & Sohn here, as it was a bottlenecked case, similar to a thin rimmed, slightly shorter 9.3x74R case.
The 9.3x72R E (English) case had a .429” base, .484” rim and a straight taper to the .395” od mouth.
The 9.3x72R D (Deutsch) case had a .433” base, .492” rim, a rapid taper down from base for about 15 mm, then nearly cylindrical to the .395 od mouth.
The 9.3x72R Nimrod was nearly identical to the E type, merely with a slightly smaller .478” rim.
To clean up the confusion a commission of proofhouses, ammo- and gunmakers was formed to normalize case dimensions. The normalized cases were designed without any odd changes of taper, so any of the older chambers could be easily rechambered for the new Normal shape. Reproofing was unnecessary as the loads were unchanged.
So the 9.3x72R Normal was born, with a .430” base, a .486” rim and a straight taper to mouth. This is the only type still available.
If a modern 9.3x72R Normal case does not fit your chamber, smoke the case with a candle to find out where it hangs up in your chamber. Resize the case accordingly, using improvised sizing dies, until it fits your chamber.

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