Quote:

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per kuduae ....."Just a terrible suspicion came to my mind: Perhaps the barrel is still in 8x57I, but the muzzle is backbored to about 11 mm.
Doing this was a common practice to salvage a barrel with a worn out muzzle, but preserving the original front sight base.
The seller of the rifle may have looked at the muzzle only and guessed at "about 11 mm".

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Hello All,
Thanks for the reply.

If the rifle turns out to be an ordinary 8x57I with an altered muzzle as mentioned above by kuduae, I am really going to be pissed.

I paid a BIG premium for a prewar 11mm Big Game rifle. I collect Big Game rifles, not 8x57 sporters.

Also, I assumed the caliber was going to be 11.2x72 Schuler as that is the only 11mm I found commonly associated with Johann Peterlongo.
I spent over $500 to buy dies and 100 pcs of brass to load the 11.2x72 Schuler cartridge, which may turn out to be for a caliber I don't have.

Fortunately I didn't have to buy bullets because I already swage custom .439 dia. bullets for my 11.15x58R Austrian Werndl rifles.

Although I will do a chamber cast if its an 11mm, a simple "look" at the chamber and the muzzle will reveal if its an ordinary 8x57I caliber.