If you cant find one to borrow, it would probably be easier to buy a case checker (guage) for your new caliber and this will give you a better idea of whats going on. I have a 6.5 cm and I have several boxes of new Nosler ammo for it that wont seat in the case guage and are sticky to chamber and extract.
Also you can look up schematics for all calibers that give every dimension and this also allows you to see if/where you may be oversized on the ammo, if that is the problem. Simple to compare measures with your caliper.
I also have the head space guage set.
