Just took mine out to the range today for the first time. These things have TIGHT chambers! 1.900" measuring with a .35cal hornady bullet comparator. Comparing that to the factory round (Remington) it looks like the fireformed brass almost shrunk in size.
That combined with the sharp rifling, I see very nice groups in this rifle's future.
Oh, and for those who have never shot an 8mm Mauser, it's alot nicer than the .303 and 30-06; recoil is great and shooting without ear pro wasn't unbearable making this rifle a good go-to hunting rifle.