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Is it possible it is a 9.5X57 and the barrel is marked wrong?
That sounds like a more logical explanation. It's OK if it is. The 9.5 is a fine shell too
obturation of the .366" up to 375" seems like an awful lot to "bump-up" but it may be possible due to the weight of the bullet. Such heavy bullet have a lot of standing momentum compared to something of ...say...30 cal. Maybe they are obturating enough to fill the bore. I'd slug the barrel and measure to be sure it is not a .375" instead of a .366"
I make a 9.3X57 for myself on a 98, and my shells come out with only a small amount of neck expansion.
One problem is that the chambering is not marked! It definitely is a 9.3mm bore, not a 9.5. The only thing out of the ordinary is the excessive expansion of the case neck upon firing. And that is only a problem when I start to re-size the cases. In order to not excessively work the brass, I will have to squeeze the necks down just enough to grip 9.3 slugs.
Ironically, when I obtained the rifle I assumed that it was a 9.5x56. When I actually measured the bore, I discovered that it was a 9.3. I determined that it was not a 9.3x62, and concluded it must be the -56 version; I didn't make a chamber cast to confirm my conclusion. I have to wonder what would have happened if I had fired a 9.5x56 cartridge: would the bullet be able to squeeze down enough to transit safely?
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Re: 9.3 x 57 Puzzle